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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 12, 2008
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Open Help Requests for GM
Help Request Answers
1992 Buick Skylark Custom 2.3L No Start, Poor Idle Quality, Cuts out, Misfire VIN: 1G4NJ1432N
we have a car demon. this car was towed to us as a no start. vehical had spark, fuel, and injectoe pulse. car will atempt to startas though it has a blown head gasket. checked comp. 140 lbs on all 4 cyl. timing marks are dead on. wierd thing is that the scanne...
1995 Buick Riviera 3.8L Starting VIN: 1G4GD2210S
Customer was driving along , engine quit. Towed to shop has spark and fuel presure, no power to injectors. Also no power to most fuses in D/S fuse panel. Looks like the pink wire from ignition controls the panel . Iam looking for a wiring diagram for the ignit...
1996 Buick Skylark Limited 2.4L dash lights VIN: 1G4NJ52T6T
car will run but tempt and tach will stop working and idiot lights will pop on
2002 Buick LeSabre Custom 3.8L Electronic VIN: 1G4HP54K92
I have this 02 Buick lesabre that came in with an in op blower motor, found the 30amp fuse that feeds the blower motor module to be popped. Installed new fuse and preformed amp draw on the blower motor and found to only pull 8amps. Then I went to run the car o...
1998 Cadillac DeVille 4.6L rear knuckle VIN: 1G6KD54Y6W
The upper bushings in the rear knuckles are worn out.I was wondering if anyone knows of a replacement bushing for this.The only way I can find the bushing is in a new knuckle. Thanks in advance for all the help
1988 Chevrolet Corvette 35th Anniversary Edition 5.7L Hard start cold VIN: 1G1YY3184J
Hey guys,This car came in with many problems. Fixed them one by one ,But still have a hard start problem cold. Fuel pressure drops very little while sitting. This car has a aftermarket pressure regulator, And no cold start injector.(someone plugged the hole) I...
1994 Chevrolet C1500 5.0L Unknown VIN: 13MV456GH6
okay after sitting in the cold all night, will drive truck at my first and sometimes second stop it wont go after a full stop, have to put in park or reverse then it will work fine. has anyone had this problem before??
1996 Chevrolet Lumina APV 3.4L interior lights and door locks VIN: 1GNDU06EXT
Hey everyone. Hope you can help. We've got this Lumina APV here that at times will not shut off the interior lights. When the van is sitting at night the lights will come on and start dimming up and down, and with out even touching the van they will go back ou...
1998 Chevrolet C3500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 1GBGC34R2W
dont know how long before intake manifold was replaced before timing chain or if problem happened after this. came in with noticable miss under light load or revving engine up in park. found dist cap loose and rotor not screwed down and broke. replaced cap ro... Trouble codes: 300 (multiple misfire)
1999 Chevrolet Cavalier LS 2.2L hard start VIN: 1G1JF5245X
most of the time if this car sits for a while, it will have extended crank time when starting. initially suspected faulty fuel pump. fuel pressure within specs. no codes in computer. using tech service hotline, checked for voltage at ignition module while cran...
2000 Chevrolet Silverado 1500 5.3L 2-3 shift VIN: 2GCEK19T0Y
this truck has been a nightmeer. my customer is afraid with the 2-3 shift flare it will end up burning this new trans up also i hope someone has had this before. all this has happened in about 8,000 miles
2002 Chevrolet Silverado 2500 HD 6.6L engine VIN: 1GCHK23152
this chevrolet uses about 3 quarts of oil a week if it is run every day which it usually is it does not leak any oil and does not smoke. I have run indicator die through the motor and tried to spot a leak and have not found one.
2004 Chevrolet Venture LS 3.4L heater VIN: 1GNDX03E34
This van came in with a complaint of no heat. The engine is up to operating temp and the coolant is full. Bith of the heater hoses are hot and the inlet is hotter than the outlet, not a ton but you can feel a difference. We replaced the heater core thinking th...
2004 Chevrolet Trailblazer LS 4.2L tach/speedo VIN: 1GNDT13524
hi gm techs,i'm having a problem with a instrument cluster.it intermitantly drops out.i mean the tach and speedo go the wrong way.they point down or rotate backwards abit.the odometer still works.i scanned bcm/pcm-no codes.they see rpm and speed signal.you can...
2005 Chevrolet Cavalier 2.2L all lights on dash VIN: 1G1JC12F85
Customer came in with the complaint of all the dash lights flickering on and off and the gauges sweep just like when you first start the vehicle. pulled all the trouble codes and cleared them all. Test drove vehicle for 3 days with no problem and started this ... Trouble codes: U1064 (pcm loss of comm with bcm), U1088 (bcm loss of comm with sir), U1088 (bcm loss of comm with sir), U1000 (radio loss of comm with sir), U1016 (sir loss of comm with bcm/pcm/vcm)
1993 GMC G3500 Rally 5.7L Electronic VIN: 2GTGG39K5P
thanks in advance for any help on this one.trans shifts fine until ANY electrical device is turned on(heater fan,lights,etc.) at this point, it will not shift out of 1st. the alt guage also crashes down to 8v, but it is still charging 14v at the battery.i'm th...
2003 GMC Yukon XL 1500 SLT 5.3L ecm, abs, locks VIN: 3GKFK16Z23
This vehicle has multiple electrical problems all intermittent. As you are driving this vehicle, sometimes when hitting hard bumps in the road, several malfunctions occur. The ABS light comes on, the CHECK ENGINE light comes on, the DOOR LOCKS CYCLE, THE SEAT ...
2009 GMC Yukon XL 1500 SLT 5.3L MIL Lamp on VIN: 1GKFK36399
This truck came from a local body shop (front end damage) with a dead battery and multiple codes. Everything checks out OK except we can't get the P069E code to clear. The vehicle starts and runs fine. Our Tech 2 has 2008 software and pulls the code and descri... Trouble codes: P069E (Fuel Pump Control Module)
2006 Hummer H2 6.0L ignition lock, solenoids VIN: 5GRGN23UX6
I saw a previous post on this problem but it was closed with a summary not a fix. What happens is suddenly one time you take off and it is in limp mode and the key cannot be removed. I found a TSB on the problem but it doesn't really help this vehicle has no a...
2002 Saturn Vue 2.2L Drive-axles VIN: 5GZCZ33D52
Hi I have a customer with a 2002 Saturn VUE this is the second transmission that is going bad. The customer wants to convert it over to manual gear box my question is have any one done this before and what parts do he need also will it affect the ecu or the dr...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Chevrolet C1500 Cheyenne 4.3L cooling system VIN: 1GCEC14Z7R
problem found : first i want to thank every one that gave some input.I tested coolant system for hydro carbons and got 75ppm confirming head gasket leakage.note this vehicle had no driveability complaints.i had tested hc after about 10 min run time no results ...
1998 Chevrolet Blazer 4.3L Poor Idle Quality, Hesitation, Surge, Stall, Misfire, MIL Lamp on VIN: 1GNCT18W4W
found timing chain is bad custemer did not want to fix it Trouble codes: P0300.
2000 Chevrolet Blazer LS 4.3L 4 wheel drive VIN: 1GNDT13W2Y
Thanks to all who responded. The vehicle was test driven without the lamp reoccuring. Ran through all modes and everything seemed fine. Delivered and the owner stated the lamp returned before they arrived home. Once the vehicle returned the lamp was off but th...
2001 Chevrolet Blazer LS 4.3L Misfire VIN: 1GNDT13W71
Thanks for all of the replies. I received serveral replies, bad valve spring, fuel injector, distributor gear worn excessively, internal vacuum leak, excessive crankshaft end play. Here is the testing I have done. Performed compression and running compression ... Trouble codes: P0300 (Random Misfire).
1994 Geo Metro XFi 1.0L mil VIN: 2C1MS2461R
My first time diagnosing a Geo so thank you Ron for the excellent advice! I was reading TechHelp and thought they all had maintenance reminder switches. I retrieved 2 codes like he said to do {scanner said to do something else that didn't work} code 13 O2 sens...
1985 GMC S15 High Sierra 2.8L Poor Idle Quality, TIMMING ADVANCE VIN: 1GTCT14B2F
hi and thanks to all that responded, well further diagnsosis found egr leaking past pintal, cause for rough idle and stall condition, this engine had the intake gaskets replaced for coolant leak about 8 to 12 months ago, and the back of the intake was not se...
1999 GMC Sierra 1500 SL 5.3L instrument cluster VIN: 1GTEK19TXX
tested and verified cluster bad,replaced with new works great now.thanks for everyones help
2000 Pontiac Bonneville SE 3.8L locks, windows,mirrors VIN: 1G2HX54K8Y
Many thanks to Craig for helping answer my question which was what should the simple bus voltage be. The answer was that there is no set range unlike most data lines. It seems as long as there is some sort of fluctuation in the line it apparently is trying to ...
2000 Pontiac Grand Am SE 2.4L Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1G2NF52T6Y
After isolating the problem with all of your tips, it seems as if the timing chain has jumped on the exhaust side. The chain was recently replaced at another shop and will go back for a warranty repair. Thanks , Tom Trouble codes: P0300, P0172.
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