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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 27, 2004
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Open Help Requests for GM
Help Request Answers
1993 Buick Regal Custom 3.8L Poor Idle Quality, Surge VIN: 2G4WB54L2P
This Buick will intermittantly idle poorly. It has a "rolling" idle or it may be described as a surge at idle. Sometimes it will do it just as the car is started, or it may not occur for 50 miles of driving. We have been chasing it for almost a year on and off...
1993 Buick Century Special 3.3L Hesitation VIN: 3G4AG54N1P
running out of ideas on this one,any help would be appreciated.hesitation on acceleration all the time.if unplug the maf sensor problem does not occur.other than the hesitation this vehicle runs great,pasted state emissons testing and no ses light on when prob...
1998 Buick Park Avenue 3.8L vibration VIN: 1G4CU5211X
hello all. thanks in advance. i changed the belts on this car, the valve cover gaskets and the spark plugs. when i resstarted the car it had a vibration. I checked the plugs, firing order. all ok. car accelerates ok,no misfires, but it vibrates at about 900 rp...
1994 Cadillac Seville SLS 4.6L reverse VIN: 1G6KS52Y3R
The car has no reverse. We've replaced the selector switch. With the new selector switch in place and the shift cable unhooked we can play with the shift lever at the transmission and get reverse. It will stay in reverse only as long as the lever is held in po...
1985 Chevrolet Blazer K10 6.2L all gears
This truck is a friend of mine's and I overhauled the trans last winter for burnt low/rev clutches. All was well until a couple days ago when after a 2-3 upshift it just quit driving...It feels like there is load on the engine when in gear, but only slight for...
1999 Chevrolet S10 2.2L Misfire VIN: 1GCCS1443X
We have been over everything on this one, it has a miss we can get consistantly under light load, app 3,000 rpm, 4th gear. It can be felt other times but is most apparent then. Counters on TechII show #1 worst. We have tested spark, one coil seemed weak-replac... Trouble codes: P0300 (Random cylinder misfire)
2001 GMC Savana 1500 5.7L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1GDFG15R91
I'll start from the beginning. Customer stated the vehicle ran out of fuel. After refueling, the van started running poorly. Another shop replaced plugs and wires. Same problem. The van came to me with the doghouse off and new wires and plugs.I removed dist ca...
1997 Pontiac Grand Am SE 2.4L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G2NE52TXV
Vehicle came in with the four listed codes(P0530,P1441,P0300,P0108). It is running rough and extremely rich. Pulse width is at 4.3+ during open loop and 7.2+ during closed loop. MAP is reading 2.9-3.0 volts at idle. The cooling fan runs all the time even with ... Trouble codes: P0530 (A/C System Pressure Circuit), P1441 (Evap shows flow during non-purge), P0300 (Random Misfire Detected), P0108 (MAP or BARO Signal High)
1999 Pontiac Sunfire SE 2.2L No Start VIN: 2G2JB12A3X
Well fellow technicians, here is one that is turning me grey. The vehicle came in on the hook due to intermittant no start condition. Car started just fine with codes po335. po342 and p1629 in history. Cleared codes and started and drove car several times for ... Trouble codes: P0342, P0335, P1629

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Century Custom 3.1L Misfire, MIL Lamp on VIN: 2G4WS52M7V
Thanks to everyone that responded to my help request. I am happy to report that the vehicle has been successfully repaired and running fine for 2 weeks. As most of you suggested the fuel injectors were causing the misfire on cylinder #1 & #6. We ended up onl... Trouble codes: P0300 (Random/Multiple Misfire).
2001 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y71
why don't we start at the beginning this car came in from auction apart everything with a no start ,no crank condition tried access the pcm with the tech 2 could not was getting all power in the pcm and out so i got some info on the data path in and out the va...
1990 Chevrolet Corvette 5.7L Possible flywheel VIN: 1G1YY23805
Thanks to all and especially to those who replied. We received three replies: two pointed out that the dual mass flywheel is a known problem, one suggested crank shaft end play. We were thinking flywheel; however, upon inspection, we could see no signs of da...
1990 Chevrolet Lumina 3.1L Poor Idle Quality, Surge, Misfire VIN: 21GWN54T6L
Thanks for your tremendous responses. I further ohmed the ECT (which was was well within range hot and dead cold. As suggested I replaced the TPS, IAC, however, there wasn't any change after idle re-learn. As a very last resort, as also suggested, I replaced t... Trouble codes: 22 (high tps voltage).
1994 Chevrolet S10 Blazer Tahoe 4.3L Hesitation, Surge VIN: 1GNDT13W3R
Thanks for all the responses. You Guys are the Greatest! The problem ended up being the fuel pump. Another junk aftermarket pump that someone installed a short while ago. Also had no pulsator in line with the pump! Evidently the fuel pump would start to slow d...
1999 Chevrolet Tahoe 5.7L Misfire, MIL Lamp on VIN: 3GNEK18RXX
hay guys we have not had a chance to try some of your tips on 99 tahoe yet ,customer needed tahoe for the holidays.she will return in a few weeks. we are suspected a vaule problem on 3&4 clys,as about 50% of replys have lead us in that direction we will update... Trouble codes: 303, 304 (missfire).
1999 Chevrolet K1500 Suburban 5.7L brakes VIN: 1GNFK16R9X
Closing with a fix. what a great service, i had 27 great replies. the fix is to clean the front abs sensor mounts. the rust buildup under the sensors cause the computer to lose the signal causing the abs to kick in. i also did find a tsb for this problem. tsb ...
2000 Chevrolet S10 4.3L ebcm VIN: 1GCKT19W9Y
Replaced ebcm, car hasnt been back in a few weeks. Thanx for the replies.Sorry for the delay in closing this request.
2004 Chevrolet Silverado 2500 HD 6.0L air bag VIN: JNK45TREER
did not find the answer I was looking for but did get some feedback as to using a mastertech scanner to do this as well as using genisys although I dont thing it can be used for all module programming and the registering it on the body processor.
1996 Pontiac Grand Am SE 2.4L instrument cluster VIN: 1G2NE52T4T
thanks to all that replied. i replaced the instrument cluster and did the pass-key relearn and fixed the car. thanks again to all. chad
1999 Pontiac Firebird 3.8L MIL Lamp on, limited power VIN: 2G2FS22K5X
I cleaned and tightened the terminals at the TPS assy. Customer took the vehicle and has not reported any further problem. Must have been a flakey connection at the TPS assembly that was sensitive to temperature. Next time one of these vehicles is in the sho... Trouble codes: P1221 (TP Sensor 1 2 Performance).
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