× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 25, 2006
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
1995 Buick LeSabre Custom 3.8L No Start, Poor Idle Quality, MIL Lamp on VIN: 1G4HP52L7S
This vehicle cam in with the PRNDL, cruise, and Quad driver codes stored in memory. The customer states that the MIL stays on, but sometimes the volts and or temp lights come on. The vehicle intermittently no-starts. We have followed the troubleshooting charts... Trouble codes: P0640 (QDM 1 Failure), P0650 (qdm 2), P0670 (qdm 4), P0705 (PRNDL Switch Failure), P0561 (Cruise vent Malfunction)
1997 Buick Park Avenue 3.8L Airbag VIN: 1G4CW52K2V
1997 Buick Park Avenue engine Code K prod 6-96 vin: [...] Hi fellow techs out there, thanks very much in advance for your thoughts and experience. I've been using IATN for a little over a year now. The fix database and forum archives been very hel...
1999 Buick Park Avenue 3.8L tcc and 4th gear VIN: 1G4CW52KOX
The following vehicle was brought to me for a trans problem. It had 142500 miles on it at the time of origonal trans rebuild. It now has 148200 miles on it since rebuild occured. Car came in with multiple trans codes and shift problems. (0741, 1811, 1870) I ...
1979 Cadillac Eldorado 5.7L Hesitation, Stall VIN: 6L57B9E605
Car has a very bad tip-in hesitation, bad enough to stall when cold. Once past the flat spot, it accelerates very well. Blocking off the egr valve has no effect. It idles and cruises fine. Does anyone have voltage specs on the coolant temp sensor and throttle ...
1989 Chevrolet Camaro RS 2.8L starter VIN: 1G1FP21S7K
car will start jumping starter terminals but will not start with key, no power at starter terminals, ignition switch is working properly, i cannot find the starter enable relay for the life of me. seems like a bad relay or vats problem, which i am good at fixi...
1994 Chevrolet C3500 Cheyenne 6.5L all gauges VIN: 1GCHC33F8R
Truck blows the 20amp fuse for the gauges as soon as it is pluged in. All lights work and customer says all the warning lights work (glow plugs, Brake light,etc)just the gauges are inop.I have traced the pink and black power wire from the fuse block to the clu...
1996 Chevrolet Tahoe LS 5.7L Break Pedel VIN: 1GNEK13R7T
I receintly had to panic stop but could not and took the ditch which forced me to take one more look at it! Once again all new parts. Master cylinder, calipers, rotors,ceramic pads, rear wheel cylinders, shoes and drums! I blead every thing,Adjuster the rear a...
1997 Chevrolet C1500 5.7L serpentine belt VIN: 1GLEC14R8V
The customer says that the noise is gone for a few days everytime a new part is put on but it starts up again soon.I looked at pulley alignment and all appears to be right. All pulleys turn freely but the squeal just keeps coming back. I dont want to keep thro...
1998 Chevrolet Venture 3.4L No shift VIN: 1GNDX03E6W
Hello fellow Techs This is my WIFES van (Oh the grief!)But we won't go there. The trans is stuck in first gear,when I go it will cut out at 40 kms into nuetral then cut in at 30kms but always in first gear.If I manually select 3 or 2 gear I can keep driving in...
1999 Chevrolet Express 1500 5.7L Transmission VIN: 1GCFG15ROX
Hello group, This van will sometimes jump out of Drive into Neutral between 45-70 mph. Transmission operates normally otherwise and the fluid level is OK. Scanned for codes and had a P0430 history code [Low cat.converter efficiency bank 2] Hoping someone may h...
2001 Chevrolet Malibu 3.1L No Start, Cuts out, Stall, MIL Lamp on VIN: 1G1ND52J01
Hi Folks, This is a head scratcher for you. This car came to us 10 days ago from another shop. The car cuts out at 65mph or higher after 2 or 3 miles and sets a p0101 maf code. The other shop replaced the ecm, maf, crank sensors and ign module. We check codes ... Trouble codes: P0101
2001 Chevrolet Express 1500 5.0L MIL Lamp on VIN: 1GBFG15M41
Please help me! van came in from a side of the road car lot where one of their guys replaced the following to get rid of #4 cylinder misfiring. plugs,wires,#4 fuel injector from advaced auto, fuel filter, and the cam sensor. When I got it the distributor was... Trouble codes: P0300, P1381, U1041
2002 Chevrolet Prizm 1.8L MIL Lamp on VIN: 1Y1SK52842
hi guys, thanks in advance for your help. this car came to me with code p0446 evap vent control. i have no diagnostic info on this car. i did the easy stuff. checked power and grounds all ok. the customer told me that the light came on the first time when tank... Trouble codes: P0446 (evap emission vent control)
1997 GMC Vandura P3500 5.7L no power assist at times at idle VIN: 1GDHG31R6V
the brakes and power assist work somtimes for a few days and then with no notice all assist quits at idle, reve engine up and get some assist came back in and we replaced the pump actuator valve on rear of pump and nothing changed
1998 GMC Sonoma SL 2.2L Starting VIN: 1GTCS1442W
vehicle was towed in no start. had no power to the solenoid. did not spend much time on this since it was a saturday. came in on monday started checking a few things and found that the head lights would not come on with the key on. the dash lights for the gear...
1998 GMC Jimmy SL 4.3L heater VIN: 1GKCT18WXW
Customer complains that with the temperature control knob is set at cold and the mode position set on heat. That he has warm air coming out of the heat duct. Have checked temperature with a thermometer at heat duct with temp set on full hot, 160+ degrees. Chec...
2003 GMC Sierra 2500 HD SLE 8.1L battery VIN: 1GTHK23G63
Our customer has had a continuous drain on this truck. If left sitting for 1 to 1 1/2 weeks it will be dead and not start w/o jump or charging. He replaced the battery and problem has continued w/ new battery. Drain on the system is high at approx 245 milliamp...
2002 Oldsmobile Aurora 3.5L speed sensor VIN: 1G3GR64H12
we have this aurora that is setting code po716 input turbine sensor ckt out of range - happens around 45mph about once a week - we replaced sensor - vehicle came back and replaced sensor again - took to chevrolet after light came back on again and they said th...
1991 Pontiac Grand Am LE 2.3L Excessive Emissions, Poor Idle Quality VIN: 1G2NE54D9M
engine runs rich, computer goes into closed loop and compensates causing a lean misfire. ect, fuel pressure (39+ psi), vacuum, compression (165+ psi) all normal, filters are clean. cylinder #1 plug consistently black. swapped #1 and #2 injectors and #1 plug st...
1995 Pontiac Bonneville SSE 3.8L MIL Lamp on VIN: 1G2HZ5215S
I'll preface this by saying my good driveability tech has retired and driveability is not my new tech's strong point. This car came in /w intermittent MIL on. Sometimes comes on immediately, sometimes comes on after 15-20 minutes of driving. Has code p1640 st... Trouble codes: P1640 (quad drive 1 circuit)
1999 Pontiac Grand Prix SE 3.8L No performance issues VIN: 1GWP12K1XF
This vehicle makes a noise, sounds like a bad drive belt pulley bearing. The vehicle came in a few months ago with a rusty colored dust all around the tensioner pulley. We reccomended that the tensioner pulley be replaced, the customer declined the repair at t...
2001 Pontiac Grand Am SE 2.4L Poor Idle Quality VIN: 1G2NF52T11
This car came into the shop late this afternoon. I haven't checked out much, but this is what I have checked out so far. No service engine light, idle rpm's. 1350 rpms, the LT Trim is -10, TPV is .50. IAC position is 54 counts. Which I replaced, the idle came ... Trouble codes: N/A

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Skylark Custom 3.3L No Start VIN: 1G4NV54N8P
i got some good replies for this, sadly nothing panned out. i checked everything applicable for this car, i then rechecked everything again. it did come in with the wrong balancer on it, it has a 1x, 3x, it should have a 3x, 18x. we did order the right bal...
2002 Cadillac DeVille 4.6L Mechanical VIN: 1G6KD54Y12
Hi guys, Sorry its took so long to get back to ya, been pretty busy at the shop and at home. Ok, EVERYONE was right. I dropped the entire cradle down and it was so easy I kept expecting something to go wrong. I mean this was simple. Hell I'm ready for anot...
1992 Chevrolet Astro 4.3L abs system VIN: 1GNE19WGNB
Well this one got away with out being completly fixed It started of with abs light on and codes in system for internal switchs for ehcu # 62 & # 63 checked and cleaned ground inspected wiring harness cleared codes and retested codes came back okay simple deter...
1993 Chevrolet Lumina 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 2G1WL54T1P
Thanks so much for your help input. I had already checked the grounds at the computer but not the sensor grounds at the sensors. So I went back and checked all the grounds,power circuits,reference voltage,& sensor returns all the way back to the PCM. Everythin... Trouble codes: 43 (esc problem), 53 (voltage high), 23 (iat low), 25 (iat high), 21, 22 (tps low high), 86 (internal ecm problem a/d error).
1996 Chevrolet Lumina 3.1L Poor Idle Quality, MIL Lamp on VIN: 2G1WL52M4T
I inspected inlet hose and did not find a leak I suspected injector problem from that point, but customer chose not too continue testing. Thanks for everyones help I was hoping customer would change his mind but he did'nt. Trouble codes: P0300.
2000 Chevrolet Cavalier 2.2L Air Bag Clock Spring VIN: 3G1JG5247Y
I did not fix this car Had 3 replys the noise is from the clock spring in most cases but also combination switch and covers fixs would be replace clockspring but the noise could return , try very sparing lube to that the way it is. Thanks Mike
2002 Chevrolet Silverado 3500 6.6L No Start, Stall VIN: 1GCJK33162
i'm calling this vehicle fixed but i don't know for sure. this has been a good learning experience for me and, thanks to the great responses from the iatn and a very patient customer, i got some schooling on this one. most of the replies mentioned leaking fuel... Trouble codes: 0087 (fuel rail pressure low while high pressure commanded).
2002 Chevrolet Impala 3.4L cabin air filter VIN: 2G1WF55E12
sorry i left this open for so long been very busy. jessie from louissianna was right . The right cowl was warped. Thanks to everyone who has replied.
2004 Chevrolet Tahoe LS 4.8L Hesitation, Surge VIN: 1GNEK13V74
I recieved a majority of imput which centered on the fuel system. I checked the fuel at the return line after about 3 hours of idling and it was warm and had alot of air in it. I really didn't have a solution to offer them so let them have it back
1995 GMC K2500 Sierra SL 6.5L No Communication VIN: 2GTFK29S9S
I am sorry to say that I have wasted your time and mine. The next morning, my boss turned this truck over to another tech in our shop. Guess he thought I couldn't handle it. I myself thought it was a scanner issue. None the less, I think the tech threw a fuel ...
1995 Oldsmobile 88 Royale 3.8L Poor Idle Quality VIN: 1G3HN52K7S
Thank you for all the help. There were two problems. The first problem was when the machine shop did the head work they did not put a plug back in on the top center of right head which was causing it to have a vacuum leak. I put in another plug and now I even ...
2002 Pontiac Sunfire SE 2.2L rear bk/abs VIN: 1G2JB12492
thanks to all who responded. the fix was the rear shoes and drums. david=nj, david=oh, and phil=min hit it on the head. the org shoes looked perfect and they where dry as a bone. when we removed the drums they where out of round so we replaced them, mainly bec...
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next