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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 22, 2006
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1992 Buick Roadmaster 5.7L Poor Idle Quality VIN: 1G4BN5371N
When car is in park or neutral, iac is 30-35, when put in gear or drive down the road iac goes to 180 and, of course, idle is very high. Also knock sensor goes on and off. Any help appreciated.
1991 Cadillac DeVille 4.9L heating VIN: 1G6CD13BXM
car came in for no heat i have flushed cooling system checked t for glogging and blew out heater core, i checked air mix door and programmer seems to be switching fine,but i have heat only on passengers side of car defrost and floor checked all duck work seems...
1986 Chevrolet C10 Custom 5.0L Poor Idle Quality, Stall VIN: 2GCDC14H7G
This truck stalls when you let off the gas from a cruise and slowly come to a stop. It idles fine in gear sitting still even if you goose it and let off the gas. The one weird thing is if you back up in reverse and stop it seems to be O.K.. But if i get up to ...
1997 Chevrolet S10 2.2L Pressure plate VIN: 1GCCS1441V
Customer does not use truck much . When engine installed , clutch seemed good (Please see testing & repair history) . Customer complains of slipping and complaint verified . Disassembly reveals almost NO wear on disc . Logo (in ink) is still visable on disc . ...
1998 Chevrolet Cavalier LS 2.2L starting cold VIN: 1G1JF5242W
this vehical has a starting problem when it is cold out in the morning after its been sitting all night.when you go to start it,it will start then shut right off then it may do it again or it may not start at all after about 15-20 tries you can get the vehical...
1999 Chevrolet Silverado 1500 4.8L No Start VIN: 2GCEK19V6X
this truck has a 4.8 engine, not a 5.0, iatn did not show this option when starting this request. the problem with this truck is that it does not have feed to the fuel pump relay from the pcm, so when you key up there is no 2 second pulse, we check the wiring ...
1999 Chevrolet K2500 Suburban 7.4L Poor Idle Quality, Misfire VIN: 3GKGK2GJ0X
When the vehicle came to me the tech from the other shop told me that he knew that it had a miss on #7 cylinder. He said untill the vehicle would warm up it would run fine. So I hooked up the Tech 2 and sure enough the #7 cylinder was missing. I hooked up the ...
2001 Chevrolet Monte Carlo LS 3.4L security VIN: 2G1WW12E91
This car came in as a interminnent no-crank, It will be a no crank untill the owner dis-connects the battery and then it will start. I suspected that it had a bad BCM, I put a new BCM in it, Reprogrammed it with the Tech 2 and now it is a no crank no matter wh...
2001 Chevrolet Silverado 1500 5.3L hard start VIN: 1GCEK19T91
hello, truck is here for a hard start when engine is cold, fuel pressure is 62psi koeo but imedeiatly drops down to almost 0 ,we tried pressure gauge on our own truck and it works fine.if you crank over the truck will start. there was fuel coming out of the fu...
2002 GMC Sierra 2500 HD 6.0L abs VIN: 1GTHK29UX2
The customer came by our shop a few days ago, and said the ABS is "turning on" just as the truck come to a stop. I test drove the truck and as he said, just before the truck comes to a stop (about 5 mph) the ABS will come on and cause the pedal to vibrate, It ...
1987 Oldsmobile Delta 88 Royale 3.8L Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1G3HN5436H
well this one came from another shop, they had put in a new mass air flow sensor removed the cat put in a new fuel filter and new plugs. the car has now power when reved it will whant to die and back fire, the o2 stays lean almost all the time even when idling...
1996 Pontiac Sunfire SE 2.2L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: IG2JB1248T
This vehicle came in with the complaint of the mil light on and stalling at times. We scanned the car to find code p0172 and p0301. We found the #1 injector to be bad and replaced the injector. The injector was put in without the lower o-ring and one thing lea... Trouble codes: P0303, P0172
1998 Pontiac Trans Sport Montana 3.4L abs module VIN: 1GMDX03E2W
this van has an immediate amber abs light & traction control light on start-up. it sets a code c1245 which is rf motor is not turning. i have checked power & grounds to the module, checked wiring from module to abs motor pack, replaced abs hydraulic unit, cont...
2001 Pontiac Aztek 3.4L MIL Lamp on VIN: 3G7DA03E41
Hair all pulled out please help , looking at all this codes is this a car that has varies problem related to how new it is . not sure can anyone help tell me if anyone has seen this codes and can tell me were to go with this car , dont know the history on this... Trouble codes: P1186, B0029 (LF side Deployment loop open), B0041 (Engine oil pressure switch), C0245 (Wheel speed sensor Freqency)

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Rendezvous CX 3.4L MIL Lamp on VIN: 3G5DB03E32
Thanks for the help iatn techs. I'm sorry for the lack of info in my reqest for help.I had a neg fuel trim and checked all the normal componets that are known to cause it and got off on the wrong track.I though the evap systeme was the fuel trim problem.But af... Trouble codes: P0172.
1995 Cadillac DeVille 4.9L ventilation VIN: 1G6KD52B4S
Thanks very much to all!! The problem was the fact the heater core was plugged. We had to flush/backflush twice but it worked. Thanks again and Merry Christmas,,, Robert
1991 Chevrolet S10 4.3L Excessive Emissions, Poor Idle Quality, Stall, Poor Fuel Economy
We found that with the S10 4.3 engine is it dumps ALOT of fuel on cold start up. The Map sensor was ultimately bad, and with all the fuel in the engine & oil, the truck was FLOODED! after changing the map sensor & engine oil, cleaned spark plugs the truck fire...
1994 Chevrolet S10 4.3L 4wd VIN: 1GCDT14WXR
First of all thanks to every one that responded, and special thanks to Rick, Bruce, Patrick, James, and Bill, who were all partially correct. I installed a new encoder motor and then I had 4wd hi and lo, perfect and consistent every time, but it still wouldn't...
1994 Chevrolet S10 4.3L flywheel VIN: 1GCDT14Z7R
Hey guys thanks for the comments. The answers conflicted so I'm not sure what to recommend to my customer. Thanks all the same and Happy Holidays!
1998 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 2GCEK19R3W
I was hoping this would be a pattern failure description. As most of you suggested, the distributor cap was cross-firing internally causing this thing to crank like the distributor was 180 out. Thanx so much for your help and input.
2000 Chevrolet Blazer LS 4.3L Poor Idle Quality, Misfire, MIL Lamp on, engine misses VIN: 1GNDT13W0Y
well after checking over all cylinders had 150 psi cranking we ran was backfiring from # 3 cylinder found running compression of 60 psi found running compression , was bad exhaust valve spring
2001 Chevrolet Silverado 1500 5.3L Heater control VIN: 1GCEK14T41
I got the truck back in, and tested it the way many of you suggested. Some hit it right on the head. It was the blend door motor. I also did a test drive on the NAPAFIX system. There were also many people who also helped direct me. I did find some misleading i...
2001 Chevrolet Impala LS 3.8L Radio VIN: 2G1WH55K61
This sound system now works. Not really sure why, changed the amp in trunk on a guess. All the values to and from the amp are the same with new amp and old. Purple wire that I was concerned with(labeled 'amp present') seems to make no difference to operation. ...
1997 GMC C1500 Sierra GT 5.0L heater core VIN: 1GTEC14M3V
thank you for all your help waiting for customer to get back
1999 Oldsmobile Intrigue GL 3.5L cruise control VIN: 1GF2BUFMSE
thanks for all the help found a broken green and white wire from cruise module to ecm repaired works great
2000 Oldsmobile Intrigue GL 3.5L Cuts out, Stall VIN: 1G3WS52H6Y
i recieved some great tips about how so many techs have fought with this same problem. i was told by a few guys that the ignition switch failing causes this problem. after toying with the ignition switch and proving it faulty, we replaced it. haven't had the p... Trouble codes: P1189 (oil pressure switch ckt open/ short).
1993 Pontiac Grand Am SE 2.3L Cuts out, Stall, Misfire VIN: 1G2NE5431P
Thank you for all the replies. As most said the coil cover was causing the problem. Installed new cover and car is good to go. Thanks again for all the replies.
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