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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 5, 2007
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Open Help Requests for GM
Help Request Answers
1995 Chevrolet Lumina LS 3.4L timing belt VIN: 2G1WN52X1S
vehicle has no rpm drop from rear three cylinders when disconnecting the spark plug wires. we put a new belt in due to a shredded old one and the car ran the same then. pull a plug wire off the rear no change pull a wire off the front cylinder and the engine a...
1999 Chevrolet Express 3500 5.7L Excessive Emissions, Misfire, MIL Lamp on VIN: 1GCHG35R9X
engine missing on right bank only, you can feel and watch misfire counter on cylinders 2,4,6,&8. oxygen sensor repalced bank 2 sensor 1. the vehicle as it warms up starts to blow black smoke (over fueling) and missing on the right bank. we have removed the upp... Trouble codes: P0151 (o2 sensor circuit low voltage), P0174 (system too lean)
1999 Chevrolet Silverado 1500 4.8L abs module VIN: 2GECEC19V4
The Abs light and brake light come on and then go off intermittently, it set a code once of co265, but it will not alway set the code. Help David
2001 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Hesitation VIN: 1GCEC19T21
Vehicle came to us with complaint of hesitation/stumble when cold. Overnight or 3 hour-plus sit. No SES lite. Checked codes, did have P1133 and P1153 in memory. Checked MAF sensor (even swapped with new one) and no diff. Throttle body was clean. Fuel pressure ... Trouble codes: P1133 (Delphi HO2S Monitoring Bank 1 not switching), P1153 (Delphi HO2S Monitoring Bank 2 not switching)
2002 Chevrolet Impala 3.8L Surge VIN: 2GTWH55K82
this unit has a chuggle/ fish bite at cruising speeds intermittently found a gm tsb that described the condition 100% it said to replace the tps with updated part # this was done and 3 weeks lated the unit is back with the exact same concern any other ideas as...
2002 Chevrolet Impala LS 3.8L door locks,trunk lock VIN: 2G1WH55K02
door locks and trunk lock randomly lock and unlock and trunk pops open wile car sits
2002 Chevrolet Silverado 2500 6.0L MIL Lamp on VIN: 1GCHK24UX2
This truck intermittently turns the MIL on with P0102 I checked for leaks in the intake pipe after the MAF I have checked for vacuum leaks, I checked and cleaned grounds, checked voltage at Pink voltage in to MAF, checked voltage and frequency on yellow wire s... Trouble codes: P0102
2003 Chevrolet Suburban 1500 LS 5.3L air bag VIN: 3GNFK16Z03
pulled code B0092 "suppression system #1 malfunction" alldata gives no-data. anyone car to send some help. need info to troubleshoot
2003 Chevrolet Impala LS 3.8L Door locks VIN: 2G1WH52K23
Vehicle came in with a door lock not working complaint; replaced fuse - locks work. Also has an intermittant "Security" light flashing. One time while at my shop, it wouldn't start and the exterior lights stayed on continuous. Vehicle has had no starting troub...
1995 GMC K2500 Sierra SL 6.5L Stall, Misfire VIN: 1GTGK29FSE
looking for gm diesel techs.this gmc belongs to my son in kentucky .this truck has developed a stall while driving at any speed,truck has a chip ,boost controllor,4 in exhaust and has not given any trouble in the 5 years since being modified.good pmd has been ...
1996 GMC Jimmy 4.3L Starting VIN: 1GKDT13WXT
We had a 1996 jimmy with a 4.3 "W" engine in it. This vehichle will not start. With the scan tool hooked up, it has 5 volts to the TPS, coolant temp sensor. The coolant temp sensor reads -41 degrees and so does the air intake sensor. I unplugged them and it st...
2003 Hummer H2 6.0L Air ride VIN: 5GRGN23U93
Good morning everyone- I have a hummer in my bay that has a left rear air spring slowly leaking.Looked through the alldata remove and install does not look too bad.My problem is depressizing the system to do the R&R of the bag.The only instructions I found was...
2003 Hummer H2 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 5GRGN23U23
well guys i need help with another head scratcher! this vehicle has multiple mis-fires on all the cylinders on the left bank. but only under load. at idle it only has mis-fire on cylinder #1. i've tried plugs and wires, i've switched coils and injectors, teste... Trouble codes: P0300
1999 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 1G2JB1241X
ran diag replaced pcm had reflashed now light comes on right away instead of having to drive awhile . i have unplugged the a/c hp switch and still has only 1.52v at pcm plus the cooling fan is always on as well even with the new pcm any other ideas.before the ... Trouble codes: P0107 (map signal low)
1999 Pontiac Bonneville SE 3.8L Cuts out VIN: 1G2HX52K2X
vehicle will loose power and barely run and stall. Fuel pressure will not go above 10psi when re cranking after this occurs. appears to be voltage drop to pump. reg ok . let it sit awhile and will operate fine for days and/or hours. Been running in shop and on...
2003 Saturn L200 2.2L Fuel smell VIN: 1G8JU54F53
Greetings fellow Techs, Strange problem with this vehicle. I hope someone has seen it before. Vehicle towed in 1 month ago dead. Fuel pump tested bad. We replace with oe fuel pump. Every since then customer has complained of strong fuel smell coming in car th...
2004 Saturn Ion-1 2.2L Valvetrain VIN: 1G8AF52F94
Car was recently at dealer for a #2 injector and diagnosis of valvetrain noise problem. Dealer told customer needed a head job and noted TSB for "porous" head condition. Checked all plugs no water intrusion...car started making bad valvetrain noise after runni...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick LeSabre Limited 3.8L Surge VIN: 1G4HR52L7S
Thank you all very much, this is awesome!!! A new T.P.S sensor fixed the problem, the voltage was creeping up and telling the computer to open the iac all the way. once again thank you all that responded so quickly, i hope i can help someone soon. sincerely,...
2002 Cadillac Escalade 6.0L Heating temperature VIN: 3GYEK63N02
Thanks again for all the good ideas. What I ended up finding wrong was the actuator locked beyond the limits in one direction. Prior to us getting this vehicle, the customer installed a temp actuator and didn't mount it. What happens is the actuator will go be...
1996 Chevrolet K1500 6.5L No Start VIN: 2GCEK19S3T
thanks to all who responded on this truck.we replaced the injection pump and all is fine.the shaft is not broken,my assumption is something inside the pump.customer has taken truck and is happy,hopefully does not happen again.
1998 Chevrolet K1500 Cheyenne 5.0L Unknown VIN: 1GCEK19MXW
Thanks for all the help and information. I still don't know what is causing the noise, but I've gotten to the point that it only lasts 15-25 seconds on a cold startup, and can only be heard through the wheel wells. Thanks.
1999 Chevrolet Venture 3.4L Misfire, Misfire #4 Loaded VIN: 1G2HX53L9P
So much for GM datastream giving accurate cylinder misfire info. This vehicle was fixed yesterday by changing the Number 1 plug wire and not cylinder 4 like the datstream indicated as the missing cylinder. Trouble codes: P0300 (Datastream indicates cyl 4 misfires - 4000RPM and up half throttle or more).
2002 Chevrolet Venture LS 3.4L windshield wipers VIN: 1GNDX03E52
Thanks for all the help, after checking all your suggestions still no park. So I'm about to give up and give it back to the custumer I remember I need to replce the wiper blades after banging then into each other a number of times. Put new blades on and it wor...
2005 Chevrolet Malibu LS 3.5L power steering VIN: 1G1ZT54845
Well since the new column would have to be reprogrammed we sent the customer to a local dealer whom we have a good working relationshio with. Upon arriving at the dealer the service writer ran the VIN and found that the column had just been replaced at anoth...
2001 GMC Yukon Denali 6.0L planetary VIN: 1GKEK63U21
thanks for those who gave me their input. i'm just going to use the gm one sent to me from transtar, but i still question it's longevity.
2003 GMC Envoy XL SLE 4.2L Stall VIN: 1GKET16S33
Thanks to all who took the time. This a great tool. Using the sugestions of most of the e-mails, we retested the cam semsor with the scope hooked up, and tapped on the cam sensor. the pattern would change and also the idle speed would slow down. We installed a... Trouble codes: P0172, P0340.
2005 GMC Sierra 3500 6.6L no fuel transfer VIN: 1GDJK34295
Updating the computer to the latest update for that trouble code seems to have fixed the vehicle. Trouble codes: P2636.
2005 GMC Sierra 2500 HD 6.6L frame VIN: 1GKC2567R8
After deliberation Dealer is going to weld new bracket on frame with a supposed certified welder and not give him a hassle when turning in at lease end
1998 Oldsmobile Intrigue 3.8L code po040 VIN: 1U3ABR124W
thanks guys. Idug back into the harness about 12 inches and found one of the twisted wires almost broken. Put a new pigtail on and it fixed it. thanks again to all that replied.
2000 Oldsmobile Bravada 4.3L MIL Lamp on VIN: 1GHDT13W0Y
Thanks to all who replied. 7 in all. Most all replies thought it would be the sensor on top of the fuel tank. Owner elected not to repair at this time. Some suggested replacing fuel pump and all while tank is down. Probably not a bad idea. I think I will have ... Trouble codes: P0446, P0452, P0453.
1995 Pontiac Bonneville SE 3.8L Head Gaskets VIN: 1G2HX52K9S
Thank you all for responding. As one put it, I do feel like I've been living under a rock for a few years. 47 responses & all were correct. This was a defective upper plenum. As stated, it was blown through at the EGR tube. Replaced with $149. aftermarket & it...
2000 Pontiac Grand Prix GTP 3.8L Excessive Emissions, No Start, Poor Idle Quality, Stall VIN: 1G2WR1217Y
thanks for the help everyone! several mentioned the fuel pump & i had already checked that. but after going over everything i decided to check the fuel pressure again with a different gauge!!! and the fuel pressure was off, replaced the fuel pump & it also had...
1998 Saturn SC2 1.9L Misfire, MIL Lamp on VIN: 1G8ZH1270W
A huge 'thank you' to all who spent some of your time with me. After a few suggestions and one more check of every system, we still could see a fluctuation in the vacuum gauge when this vehicle started to act up. So we were sure the problem was mechanical. Lik... Trouble codes: P0302.
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