Engine Surge Or Hesitation

Low mileage. The engine will misfire if there is a problem with the cables. i don't lose any speed, but until the grade shallows out, it jerks. GM will fix it at no charge up to 120,000 miles. Engine hesitation, almost by definition, usually goes back to a misfire in one or more of the cylinders. #4cyl misfire,so he put in another new spark plug,no change,but now the check engine light is on steady instead of blinking. Hesitation is when your engine misfires, stumbles or lacks power when you accelerate or step on the throttle. These codes can cause you to fail your local vehicle inspection, or at the very least can result in that alarming orange glow to appear on your dashboard: the Check Engine Light. An initial decision about the cause of the problem needs to be made. 8l automatic sonic. Define surging. If the main jet doesn't solve it, try setting the accelerator pump (see below). once these symptoms go away it runs great. Ford has issued a technical service bulletin (TSB) 07-10-7 to address problems with a rough idle, rolling idle, or induction backfire on 2003-04 Ford Focus SVT models. 0HDI and it's developed a lack of power/juddering at around the 1800-2500 rev range, it's fine below and above that range. A quick and easy fix for idle surge, hesitation and check engine light by replacing the EGR pressure feedback sensor. At an standstill, it's never done it again, but while driving, at any speed, but usually between 20-50 mph, the engine will surge up and down 3-500 rpms. When I started it up it runs great but the engine surges from idle to 2000rpm then back to idle every 15 seconds. 3 with 50K miles, I've noticed a hesitation when accelerating. Constant hesitation is covered under “surging”. It starts and runs ok. Our 2017 Explorer 3. I've noticed similar hesitation in other TDI and some research shows that this is becoming a more common problem on mk5 Jetta with the BRM engine. Now the car occasionally hesitates while depressing the gas pedal at any speed. Above 4000 RPM, the engine hesitates then surges as if it is lacking sufficient air or fuel. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surging. 0 V6 OHV equipped Ranger for 10 years now and am very surprised at how little info there is on the net for this engine/vehicle combination. no check engine light. 4-equipped cars. What causes engine surging? I have a Cub Tank M54 with a Kaw 23 hp engine. About 10,000 miles ago, while towing our camper trailer (about 5,000 pounds), when going up hills and the engine downshifts and is at about 2500 RPM, wife and I both noticed that the engine would start a very regularly timed surging up and down in RPM. I recently bought a used craftsman LT1000 riding mower with a B&S 17. If I disconnect the battery for a few minutes, then connect, I can drive normally for about 10 minutes, then back to the surging/hesitation. I just disassembled the carb, cleaned, and put back on the bike last night. Has no throttle hesitation or any drive ability issues at all. But the surge problem is still there, and now it sometimes revs high. With the engine running, the battery terminals should be at 14. Stock tune. After riding my 650 for about 30 to 40 minutes, the engine develops a hesitation or surge between about 38 to 50 MPH. 1k and then fall back down. Holley products for GM's popular LS engine are dominating the LS scene as well. I have noticed, though that in any gear, with partial light throttle, there is some surging or hesitation around 2000 RPM. The Mercury OptiMax 200-HP runs great at all times except after being off, then starting, and trying to accelerate. Car hesitation is a symptom that shows an imperfect internal combustion in your engine. Any help would ne. 1985-1993 Dodge Ram Truck TSB Index TSB's for the older series Rams are UNDER CONSTRUCTION - Progress will be slow! Hesitation Or Rough idle; V8 Engine Buck. Just a few days ago it wouldnt even plane out with me alone. 1996 chevy 350 tbi engine, will start, idle roughly, once put into gear will die unless feathered. My 97 ranger has this hesitation/bogging when cold, after it starts to warm it its fine and runs well, I have changed the IAC, plugs, wires and the VSS but I can't seem to track it down. Hi All, I have an E60 530d, 2004 model with non-dpf. The engine appears to have a momentary hesitation, not big enough to jerk the car but one you can feel. First PO171 is a lean mixture condition; this could be caused by a vacuum or fuel issue like a poor fuel delivery or clogged fuel infectors. I unplugged it and put the plate back on almost immediately threw a code for the coolant sensor. How To Fix Engine Hesitation During Acceleration - P0100 P0104 P0171 P0172 P0174 How To Fix Engine Hesitation During How To Fix Engine Hesitation During Acceleration - P0100 P0104 P0171. It may get up to plane but then hesitates. Ranger & B-Series - '94 Ranger surging/hesitation, codes pulled, help - Problem: engine surging/hesitation, from idle to highway speeds. It has no check engine light. Time will tell if this is the magic bullet, but in response to my long term complaint about hesitation / surge / hesitation (that feeling of driving a stick in a gear too high for the speed), they reflashed my ECU on recommendation of HQ. bad hesitation/surging while driving ONLY when engine warm/full engine temp. 7 Idle surging,stalling in the alt. ven1 3 hes h(2) event 4 hes note: event cooes sta-stall siu-stumble hls-hesitation sur-suhgl comments: very hard to control- surging -vehicle sliding on molls quality t-trace m-moderate 1st cycle idle rpm vac 850. 5-1987 Truck, 1987 Pathfinder, 1987 Van, 1987 Sentra Coupe and 4WD Wagon, 1987 Pulsar NX (XE) SERVICE INFORMATION Some of the Applied Models built prior to the VINs listed at the end of this Technical Bulletin may exhibit intermittent engine hesitation or surging under load. So check your fuel filter if you start to feel a little hesitation and surging. TUNING? I haven't had any check engine lights, but I caught the problem due to the unusual idle surges. Backing out of my driveway was smooth i thought we found the problem but as soon as i put it in drive and Gave light throttle and started surging. This problem decreases engine power and might be dangerous in massive traffic on the road. 1985-1993 Dodge Ram Truck TSB Index TSB's for the older series Rams are UNDER CONSTRUCTION - Progress will be slow! Hesitation Or Rough idle; V8 Engine Buck. 8L Hesitation, Surge Posted to GM Driveability on 12/21/2006 7 Replies customer complaint of engine surge on light acceleration or going up grade. This results in an increased pressure output from the common rail diesel pump and, theoretically, an increase in performance. The document has moved here. Mechanic's Assistant: Does the light stay on, or does it blink? No check engine light on. the bowl will drop, effecting fuel delivery through the circuits. like somebody is pulling the car when I pushed the gaz pedal. The car is still weaker on power below 3k, but it's now very smooth throughout the whole rev range. It happens almost every working day. From their zoot suit wearing salesmen, to their thieving service departments. Like I said. the power dip at 4k through 5k is now imperceptable. He hooked up to his on-board scannerHe drove it hard,up a long steep grade to get the check engine light to come on. I have light hesitation at acceleration at all speeds and surging under load at 2000 RPM. This is a discussion on c5 hesitation and surging within the General Help forums, part of the LSx Technical Help Section category; I have a 1999 corvette and having problems with hesitation and surging on acceleration. What causes engine surging? I have a Cub Tank M54 with a Kaw 23 hp engine. I have a 2003 grand marquis with 90,000 miles, when I am maintaining a speed I feel a jerking sensation. Just wanted some opinions before I move forward. The car has already been in the shop before for a rough idle but was repeatedly told it was "normal". this happens from a cold start as well as during engine warm-up and occasionally when the engine is at normal operating temperature. the bowl will drop, effecting fuel delivery through the circuits. 9L Hesitation, Surge, Misfire, MIL Lamp on Posted to Chrysler Driveability on 7/9/2007 6 Replies this truck has what feels like a miss intermittently after it is driven about two miles either cold or hot. After the truck has set overnight or after a shift at work and the engine is cold when shifted into reverse it will surge like a engine with a big cam ,it will spin gravel. I noticed this hesitation issue couple of time on my 2010 LXP with 8k miles. 3 with 50K miles, I've noticed a hesitation when accelerating. notice it most when accelerating, or steady pedal pressure at lighter to medium throttle. Rob C Dodge Dakota JOIN HERE 3/19. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surging. When I bought this car, 89 Toy Camry, it'd been sitting awhile. The car has already been in the shop before for a rough idle but was repeatedly told it was "normal". Ford has issued a technical service bulletin (TSB) 07-10-7 to address problems with a rough idle, rolling idle, or induction backfire on 2003-04 Ford Focus SVT models. No stumbling, no hesitation. Re: Hesitation & Surge - Check Engine Light On - Code P0171 This thread is an example of why I'll probably never buy another GM vehicle. 2) Idle Surging. I have a 2004 CC 272 Carryall with the 400cc Kawasaki engine. surge, deceleration RPM surge, and/or tip-in hesitation may be induced. This results in an increased pressure output from the common rail diesel pump and, theoretically, an increase in performance. I have a 2011 Tundra Limited Crew Max 4x4 with about 120,000 miles on it. 5 NA limited. If the surge is due to an incorrect ignition timing setting, the timing should be adjusted. The service department told me that it was because I was not letting the engine warm up long enough. I tried blowing a little snow with it and it ran at a more stable rpm under load. Engine idles OK cold but not when warm. An engine with an obstructed bowl vent will act as though it is running out of gas. 3L and it’s driving like a dog—poor acceleration, hesitation, or a surge and you suspect a fuel problem, you may be partially right. Will pretty much go away after 3 to 4 miles of driving. Surging definition, a strong, wavelike, forward movement, rush, or sweep: the onward surge of an angry mob. TUNING? I haven't had any check engine lights, but I caught the problem due to the unusual idle surges. Having said that the car runs amazing at driving speeds and anything above idle. i cleaned the maf and replaced the tps - no change. 0 HDi is surging at low engine revs and low speed or Kangarooing: C4 2. Vehicle has 60,000 miles on it. Register now to join our community of over 125,000 members and gain instant access to all we have to offer. 3) Check Engine Light. 8L Hesitation, Surge Posted to GM Driveability on 12/21/2006 7 Replies customer complaint of engine surge on light acceleration or going up grade. it also boggs out very bad. Engine is now starting just fine. customers may complain about hesitation, surging and stalling when the engine is operated at low to medium rpm. It also runs worse as i turn from choke to run position. It has appx 63k miles. It only does the hesitation sometimes and when the engine is hot. Like I said. We will discuss two types of bog: the first is bog when the vehicle is accelerated from a stop; the second is bog when the vehicle is accelerated from cruise. i cleaned the maf and replaced the tps - no change. once these symptoms go away it runs great. Registration is fast (less than 2 minutes), simple, absolutely free and gives you access to a wealth of FIAT information. I did not notice this issue during the test drive in fact, I didn't notice the issue until after about two weeks of driving it. I'm guessing the 2 injector pumping all that gas into the engine ended up thrashing the catalytic, and that my issue now is a damaged cat that doesn't flow. An engine with an obstructed bowl vent will act as though it is running out of gas. when it goes from 0 to say 20 km i see the engine rpm going to 3000 - 3500 p/min then drops to 2000 and then again going from 20 to 50 km its shooting to 3500 rpm and then comes back to 2000- 2500 rpm. It has gotten much better with the above fixes, but it still isn't like it was. 3-liter was a surge at idle when warmed up. But the surge problem is still there, and now it sometimes revs high. This bog/hesitation fights back and forth with a surge of acceleration, even if clutch and gas are held consistent. 95 K1100LT - engine surging / hesitation / rough running « on: June 18, 2017, 09:17:22 PM » I wanted to move this off the "What did you do to your brick today" and into its own thread, because I have a feeling it will take me a while to work through this issue, although I hope not. I'm not clear if your having the hesitation when already in motion or not. It has multiple jerking type hesitation while accelrating. First, let's pinpoint exactly what's going on. ) has RPM surging problems. When one or more cylinders stops firing, the power cuts, and the vehicle hesitates under acceleration. How to use surge in a sentence. 5 years and have come to an end of my patience and am at a dead end. My Engine is Shaking, and the Car Hesitates So your engine is idling poorly (shaking, misfiring), and you are not able to accelerate properly. Searching forums and asking questions, everyone pointed the issue to 3. Also when driving, if it is cold it will knock really bad, and when warm it will hesitate and try to die at any RPMs below 2,000, so I have been running it in a lower gear to keep engine speed up. Hesitation and surging on Blazer 4. * APPLICABLE MODEL(S)/VINS. I found corrosion in the plug between my Comp MAP output and the truck's harness. An engine hesitation at altitude of 5,000 feet between engine speeds of 1,200 to 1,600 rpm. Felt at first like a transmission problem as if the tranny was slipping, but with no bang. The check engine light just came on but I can't find anyone with the right connector to read the codes. hesitation is also seen when stepping on the gas pedal when accelerating from a stop. A few niche markets lost steam right before, and others took off right after. Above 4000 RPM, the engine hesitates then surges as if it is lacking sufficient air or fuel. I went to dealer a few times, had all computers updated, a new torque converter installed, I bought a tuner, got a custom tune, still the same piece of crap. dailyscript. That was about two weeks ago and now the surge is back. I recently bought a used craftsman LT1000 riding mower with a B&S 17. The check engine light just came on but I can't find anyone with the right connector to read the codes. 2Hz (hertz) = 2 pulses per second. Rough idle Ford Focus hesitation surge Fix rough idle hesitation surge Ford Focus TSB 07-10-7. I am having a bit of a leak of fuel out of the float bolw drain. 1999 Pontiac Grand Prix GT 3. I would hate to see someone go through what I had to to find the problem, so here goes. 3L and it’s driving like a dog—poor acceleration, hesitation, or a surge and you suspect a fuel problem, you may be partially right. It does this intermittently. Spark Plug Wires failure symptoms. Maybe you can help me out. 4 4X4 Screw with 3000 miles has had since 2nd week of ownership a noticeable hesitation or "studder" under moderate acceleration in the 2500-3000 rpm range while going from 3rd to 4th and/or 4th to 5th gear. BULLETIN NOTE *Changes are also shown by asterisks. When a vehicle is hesitating during acceleration, it should be inspected by a mechanic. It happens almost every working day. 3 different carbs. Mazda RX-7 Engine Surges, Hesitates, Non-Turbo model - 2 reports. I thought it might be old spark plugs and an old fuel filter so I changed both of them out. no codes set. I don't trust any dealers' service at all so I'm sure there will be some adversity. 7 EFI's: I have a slight hesitation while initially advancing the throttle from idle. the car itself is shifting fine its just when i'm on the gas and going it seems like i have a little hesitation while its accelerating like it lags then pics up speed. I took it to a real auto tech. When you first put the car in gear to go forward you can feel the engine hesitate or miss for the first mile or two until the engine warms up. 56 gears and yes, power and acceleration is much better, but I still feel the lack of power. 0 GXi, starting my 3rd season with it. From the waveform, we can see how the FRP accessory kit is designed to convince the PCM that the fuel pressure is lower than expected. Rough Idle, hesitation on acceleration, loss of power When I start the engine its starts up right away with no issues. 9L Hesitation, Surge, Misfire, MIL Lamp on Posted to Chrysler Driveability on 7/9/2007 6 Replies this truck has what feels like a miss intermittently after it is driven about two miles either cold or hot. All - Miss, rough idle, hesitation, surge: Check the battery voltage carefully. DESCRIPTION. 2002 Sienna 285. This could happen during acceleration, driving downhill. The engine will misfire if there is a problem with the cables. 0HDI and it's developed a lack of power/juddering at around the 1800-2500 rev range, it's fine below and above that range. The regulator may need replacement. This Site Might Help You. Now I'm not just being anal about seeing FLKC numbers, the car is hesitating when this is. How To Fix Engine Hesitation During Acceleration - P0100 P0104 P0171 P0172 P0174 How To Fix Engine Hesitation During How To Fix Engine Hesitation During Acceleration - P0100 P0104 P0171. hot topic by flash #412 may '01. CIELO EURO III Engine pdf manual download. I am trying to tune out a hesitation in the off idle part throttle range. Rob C Dodge Dakota JOIN HERE 3/19. Sometimes the engine light doesnt flash at all and it just "surges" or buckles under acceleration. I built my engine stock mode. • Transmission not locking up (or. Another unpleasant side effect is that it causes my brakes be be unpredictable and weak. 4-equipped cars. Mechanic's Assistant: Are you fixing your Escape yourself? What have you tried so far? Not fixing myself. The problem occurs when the Touareg is slowing to a near stop at speeds of 10 mph or less. 56 gears and yes, power and acceleration is much better, but I still feel the lack of power. Adjusted governor. jburke4689. When I pulled into my driveway, opened the hood and noticed steam coming out, so I turned off the engine right away. My diesel engine has developed a problem with "surging" or "loping. It has appx 63k miles. Dealership confirmed the problem after test driving and they then found TSB #PIP5457C: Surge hesitation Chuggle Misfire Feeling With A Light Tip In - (Feb 10, 2017) which they believe match's the problem. I had the throttle body cleaned. This paragraph also applies to relatively stock engines with the original carburetor. brought the truck in last week, described the problem, they drove it & confirmed my description: could make it surge & chug at will - especially during hard acceleration. Im getting loss of power, engine surging, sputtering, sort of jerking and rpm fluctuation. As the engine warms, the choke blade opens further until fully open when warmed, to resume the hot engine mixture. Solution: De-grease the pipe and the tube connection to the manifold, Fit a clip to the pipe Part No 6981. Tested with separate gravity fed fuel supple to carb. I would feel when the engine hit 4k without even looking at the rev counter, now I can't tell. Chevron Techron Complete Fuel System Cleaner- 20oz - 6 PACK Cleans, restores, protects the entire fuel system (fuel injectors, carburetors, intake valves and combustion chambers)Restores: lost power, acceleration, lost fuel economy, and operation of the fuel gauge sensorReduces: rough idle, engine surge, hesitation, and spark plus foulingImproves: cold start performance, and fuel. The plugs, wires, timing belt, fuel pump, water pump, and fuel filter are all new. This was not happening until recently. B15-038 July 25, 2015 02159 Version 1 Hesitation, Surge, High Idle, or Auto Idle Stop Does Not Work AFFECTED VEHICLES Year Model Trim VIN Range 2015 TLX V6 with. also my catalytic converter has been faulty since 2 years after i got my car in 2014 view details; jul 19, 2019 - grants pass, or - engine tl the contact owns a 2014 ford focus. The surging and hesitation has not changed. Turn the heater on, and the surging starts again. Car has just over 52,000 miles. Lately the engine has been surging when idling, from 500-1500RPM, constantly, it's worse with A/C on. If all of the above is not the root problem that cause your car hesitates when accelerating, you might have to send it to a trusted mechanic and tune the engine. First, a little about the truck so you know what I'm working with so some things don't unnecessarily come up. steady, but high idle when cold (1500-2000rpm),then calms down after a few min's. The bad idle went way but then I noticed this hesitation/surge/response, when car is at normal working temperatures if I drive economically just feathering the pedal on a steady low revs (1500-1800, or I let the pedal off for a split of second and then press very slowly to keep up with the speed at 2-3-4-5th gear on a flat road the engine will. View and Download Daewoo CIELO EURO III manual online. ) has RPM surging problems. So, I went to 4. The fuel line is far enough away so I dont think it is a vapor lock. component: engine summary: this service bulletin has been issued to give diagnostic information relating to various driveability issues. Also put a CAI on it. Mechanic's Assistant: Are you fixing your Escape yourself? What have you tried so far? Not fixing myself. Its more of a thrusting/surging feeling as if it is accelerating normally, and is if i for a second lifted off the accelerator pedal, and then mashed on the pedal again, and then repeats several times like a rocking chair. Car is bogging/surging under hard acceleration Hello all, i searched for some similar posts, Im thinking maybe lines or a loose hose somewhere??? im very annoyed as i picked this car up only a few days ago, and of course with my test of the car none of this happened, it seems to do it when the engine has been on for a long trip. The service department told me that it was because I was not letting the engine warm up long enough. I have replaced the AFM, O2 sensor, tested the ICV,replaced the TPS, replaced the engine temperature sensor, and replaced the intake manifold gasket. Im getting loss of power, engine surging, sputtering, sort of jerking and rpm fluctuation. When you first put the car in gear to go forward you can feel the engine hesitate or miss for the first mile or two until the engine warms up. If the the air intake is not obstructed, the throttle plate/cable not loose or sticking, then look for spark plugs and ignition wires. My original problem with my 2004 Silverado 5. Especially when the car has been shut off, then sits 10-30 minutes and heat-soaks, and is re-started, on light acceleration, or even maintaining speed, the engine feels like someone is adding and removing throttle (surge/hesitation) of. 7 EFI's: I have a slight hesitation while initially advancing the throttle from idle. Sluggish, hesitation, surging. 0 Yes, earlier this season it was good. When I try to accelerate after that, AT does not shift. It was a $25 part and took 37. I have light hesitation at acceleration at all speeds and surging under load at 2000 RPM. I have a 1988 5. The "hesitation" is the result of an attempt by Toyota, and many other manufacturers of FWD or front torque biased AWD vehicles, to increase the safety factor of these vehicles when operating on a slippery or low traction roadbed surface. The regulator may need replacement. Gm Check Engine Light Flashing Passenger Cars, Mini Vans, SUV Service and Repairs. The problem will last a few seconds, hen go away. if i hammer down fast, it will plane out okay, and I mean lay it down as fast as possible. Why does engine surge when car is at a stop? Share this: But when I apply the brakes and come to a stop at a stop sign, the engine surges and wants to move forward. The document has moved here. I started to pull away from a stop and the throttle did nothing. I took my car to the shop, and this is what was done. I changed. Fuel pump works. Car details. Hesitations or stumbles during acceleration may also be linked to problems with the car's secondary ignition system, which includes parts such as a spark plug, rotor and spark plug wires. once these symptoms go away it runs great. 3L and it’s driving like a dog—poor acceleration, hesitation, or a surge and you suspect a fuel problem, you may be partially right. They're sailing right on through. Fuel Problems A faulty fuel system will create stalling and surging, as the flow of fuel is insufficient to meet the engine's needs. DESCRIPTION. Learn about this problem, why it occurs, and how to fix it. I am having a bit of a leak of fuel out of the float bolw drain. This wet bulb primer incorporates a check valve in the priming. Commonly, this performance problem is due to a particular system that have been neglected. Mine did it when taking off from a red light for example. He hooked up to his on-board scannerHe drove it hard,up a long steep grade to get the check engine light to come on. Subject: VEHICLE HESITATION OR SURGING / 02 SENSOR SIGNAL FAILURE. Now they think it may be something else, but they're not sure. To be sure, the index has thus far balked at record territory, topping last week (3,022) six points under its. If the the air intake is not obstructed, the throttle plate/cable not loose or sticking, then look for spark plugs and ignition wires. Hesitation/Surging 2400 to 3000 RPM and 15-30% throttle engine load. I took it in for repair and nothing is coming up on the computer. TUNING? I haven't had any check engine lights, but I caught the problem due to the unusual idle surges. Occurs right before transmission shifts as its getting into the meat of the torque curve. Searching forums and asking questions, everyone pointed the issue to 3. An engine with an obstructed bowl vent will act as though it is running out of gas. I also get the same symptoms when driving into town and back home, and on occasion the engine will shut down at a stop light or sign. It starts and runs ok. Rob C Dodge Dakota JOIN HERE 3/19. There is another possible cause for hesitation and poor idling: Water in the engine - if you clean the engine bay with a pressure hose and spray the top of the engine block, you may have troubles. I am aware of a valve cover leak but it is because one stud is stripped. Car hesitation is a symptom that shows an imperfect internal combustion in your engine. Hesitation/Surge under moderate acceleration. the car will be on cruise control and as it goes up the hill, the car starts jerking and hesitating. Not really missing, but a slight fluttering hesitation/surge under light throttle from 1600-2000 ish rpm. 3L and it's driving like a dog—poor acceleration, hesitation, or a surge and you suspect a fuel problem, you may be partially right. Throttle Surging - posted in Spec Miata Garage: When the throttle is moved just past idle and held there, the RPM surges radically, from all most stalling to back to where you are holding the throttle. The car has already been in the shop before for a rough idle but was repeatedly told it was "normal". I just bought my 08 Lucerne CXL V6 about a month ago with 31K on it. Page 2- Hawk 250 Throttle Hesitation Dual Sport Now start the engine and set the idle SPEED screw at 1500-2000 rpm. Hesitation, Surging. About 6 weeks ago my wife and I noticed that while applying moderate throttle, as you would to pass or merge on a highway, that the car begins bucking/surging, feels like it's hesitating or not getting enough fuel. Simple fix, but works for me. The Dealership says GMC is aware of this (TSB #PIP5457C) the cause is unknown at this time. Thanks for the reply. I would hate to see someone go through what I had to to find the problem, so here goes. I am having a bit of a leak of fuel out of the float bolw drain. All - Miss, rough idle, hesitation, surge: Check the battery voltage carefully. I have a 2003 monaco camelot with the cummins 8. Even though it didn't throw a code, it basically just need a tune up. Hesitation and surging on Blazer 4. Just wanted some opinions before I move forward. A friend told me it could possible be a squiter problem but John at Pony Carburetors said he didn't think so. Current one is brand new. Car hesitation is a symptom that shows an imperfect internal combustion in your engine. The stumble/hesitation at 3000-3500 is still very much present. 25k on r8 coils and iridium plugs. I am trying to tune out a hesitation in the off idle part throttle range. Any ideas what could be doing this? Ti vct. I'm guessing the 2 injector pumping all that gas into the engine ended up thrashing the catalytic, and that my issue now is a damaged cat that doesn't flow. I went to dealer a few times, had all computers updated, a new torque converter installed, I bought a tuner, got a custom tune, still the same piece of crap. When it surges, it's phenomenal, but the hesitation is a real buzz-kill. The mower may not die completely as this happens, but it may surge the entire time you mow the lawn. An engine with an obstructed bowl vent will act as though it is running out of gas. After the truck has set overnight or after a shift at work and the engine is cold when shifted into reverse it will surge like a engine with a big cam ,it will spin gravel. I went to dealer a few times, had all computers updated, a new torque converter installed, I bought a tuner, got a custom tune, still the same piece of crap. I have a 1995 Chevy Blazer that had a bad EGR valve. If surging is due to the fuel pressure regulator operating at unusually low pressure, the pressure should be checked with a fuel pressure gauge. I have a 1988 5. These codes can cause you to fail your local vehicle inspection, or at the very least can result in that alarming orange glow to appear on your dashboard: the Check Engine Light. The service department told me that it was because I was not letting the engine warm up long enough. the egr is electrical and has a motor made of clogs which takes a second to close completely. Lately the engine has been surging when idling, from 500-1500RPM, constantly, it's worse with A/C on. theres a thread on the Enclave forum of some getting the surge- whic was related to a bad coil- I dont think it set a CEL. The surging stops when the heater control switch is turned off, just like an engine acts when it is low of freon in the AC. My Engine is Shaking, and the Car Hesitates So your engine is idling poorly (shaking, misfiring), and you are not able to accelerate properly. Subsequent restarts will produce the same problem, but it goes away more quickly than a "cold" start up. Hesitation/Surge under moderate acceleration.