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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 10, 2008
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Open Help Requests for GM
Help Request Answers
1994 Buick Skylark Custom 2.3L Excessive Emissions, Poor Fuel Economy VIN: 1G4NV5534R
when customer purchased vehicle it would not pass e-check . he returned to the dealer and they kept the vehicle for a week. dealer had vehicle tested and it passed. they would not tell the customer what they had to do to get it to pass. now this year vehicle w... Trouble codes: 0X13
1989 Cadillac Fleetwood 4.5L Starting VIN: 1G6CB515OK
Hi techs: we have this 89 fleetwood that was towed in with a no start complaint. we checked for fuel and spark and have fuel but no spark. checked for 12 volts to dist. and was ok next we checked ign. coil, cap, rotor and ign. module all checked ok. checked gr...
1990 Cadillac DeVille 4.5L Driver Info Center, A/C Control Panel VIN: 1G6CD5334L
I hate Cadillacs!! This car came in for a bad fuel mileage problem. I dropped the under dash hush panel to access the ECM to current ramp the injectors. The car has "neon" lights under the dash but the controller plugs into the cigarette lighter with NO splici...
1984 Chevrolet Corvette 5.7L transmission VIN: GHNEK23456
I have an 84 corvette with the doug nash 4+3 transmission. It clunks from 1st to 2nd gear, and when the engine is cold and idling at about 1500rpm the gears will not slip in from 3rd to 2nd; The car has to be stopped and put back into 1st. Eklers sales a rebui...
1985 Chevrolet El Camino 5.0L Hesitation VIN: 3GCCW80HFS
I am seeking advice from hot rodders. It's been a long time since I tinkered with one of these! I recently installed this engine in my brother's car. It runs great and will smoke the tires off of it once I get past the stumble and hesitation in it. I set the i...
1993 Chevrolet C1500 Cheyenne 5.7L rotors VIN: 1GCDC14K4P
This problem existed before the brakes were done the truck drives excellent until brakes are applied it then pulls to the left and then right all the time and worsens the harder the brakes are applied
1995 Chevrolet Caprice Classic 5.7L Misfire, MISS FIRES IN DRIVE VIN: 1G1BL52P9S
Hi everyone.I have a good one for you all.I installed a motor into this impala ss.The motor is from a 95 camaro.It starts fine but runs with hearing a little pop out of the exhaust once in a while.I checked the firing order and that is fine.When I step one the...
1997 Chevrolet Blazer 4.3L fuel guage VIN: 1GNDT13W2V
GM tech wanted! i need a part number for the fuel level buffer module or call it the slosh module or call it whatever you want, I'm staring at it and nobody at the dealership will try and look it up because they have never heard of it before. After we explaine...
1998 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M5W
car came in with mil on po401 code. i checked snap on troubleshooter and says that pcm does a test once every ign cycle.and at 40mph on decel pcm opens egr and checks for map volts to raise.i took a movie and checked map sensor voltage when pcm is testing and ... Trouble codes: P0401
2000 Chevrolet Monte Carlo LS 3.4L wipers VIN: 2G1WW12EY9
Wipers stop in the up position when in the delay mode, they will park in the down position where they are suppose to be but does a funky jerk before it moves to park
1997 GMC K2500 Sierra SL 6.5L push rod VIN: 1GTGK24F3V
Had a noise on start up and when warmed up engine was missing.With scanner found #2 cylinder was the one not helping.also had a popping noise in intake. pulled valve cover and found exhaust push rod bent but not out of place.Valve seems to open fine now. My qu...
1999 GMC Sierra 1500 SL 5.3L No Start VIN: 1GTEC14T3X
This truck will start and stall instantly. seems like security issue. No communication with scan tool to PCM or any other modules. All fuses are good. SES light will come on with key on but no other lights on dash e.g. (air bag, seat belt, message center, door...
2004 GMC Sierra 3500 6.6L runs out of fuel VIN: 1GDJC3426E
this truck fuel gage reads empty and both tanks are full.now when the front tank runs low it wont transfer from rear and will run out of fuel, and i jumpted the leveling or transfer pump and it works? how does this sys. work have no wiring diagram.do the tanks...
1992 Oldsmobile Achieva S 2.3L Coolant Reservoir VIN: 1G3NL1436N
Hi all, This vehicle came to me with a complaint of oil in the coolant reservoir. Engine runs perfect. No misfires or smoke. Customer stated he changes the oil every 3000 miles and has not noticed the car using or burning any oil. Car does not overheat and I h...
2002 Pontiac Grand Prix GTP 3.8L starter VIN: 1G2WR12162
Vehicle towed in as a no start. Put vehicle up with helper turning key, No power on Purple selenoid wire on starter, voltage on Bat+ wire. Crossed selenoid, engine cranked. Talked to local dealer Tech, Said Ignition Switch bad. Sounded good. Replaced ignition ...
2005 Pontiac GTO 6.0L starting
Got a real fun job on my hands, Customer purchased a complete 2005 Pontiac GTO engine with controller and transmission to install into his 1993 truck. I am concerned that the engine after installed won't start because of theft deterrent. I have looked at the G...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Riviera Luxury 3.8L Charging VIN: 1G4EZ13L6N
thanks for all the help, the problem was in the inst cluster, low voltage light never came on with key on. customer didnt want to spend more money to have inst pannel rebuild. rebuilder we use for alternator added a self energing regulator. thanks again every...
1993 Cadillac DeVille 4.9L Excessive Emissions, Misfire VIN: 1G6CD53B8P
This was a real time eater but with your help we got it to pass emissions here in arizona. Ray [...] helped when he said the the o2 sensor will keep it from going into closed loop ans Juan [...] reminded me about the cracking computer boards and poor ground ...
1988 Chevrolet G20 Chevy Van 5.7L head lamps VIN: 1GACC35K2J
1993 Chevrolet C1500 Cheyenne 4.3L no speedometer VIN: 1GCDC14Z7P
thanks to larry@donsauto. I had already checked power supply at calibrator and all was good, checked again with a load at that circuit and lost voltage, I replaced ignition switch, now voltage is good, trans shifts, speedo works. thanks again
1995 Chevrolet G30 Chevy Van 5.7L Hydro Boost VIN: 1GCHG35K5S
Thanks everyone for the help with this problem. So in fact it was the pump. After everyone's feedback about how the pump could be the most possible cause, i went ahead and borrowed a friends gauge that he had made purposely for such a system. 44 PSI was see...
1996 Chevrolet K1500 Suburban 5.7L blower motor VIN: 1GNF16R4TJ
Well we checked the drain and checked for water leaks inside the vehicle and found nothing-owner did not want to pursue any furthur repairs such as the sealing of the hvac and cowling as some suggested.Says he will worry about it if he still has the truck come...
1997 Chevrolet Blazer 4.3L Misfire VIN: 1GKCS13W2V
first of all thanks for all the replies,after some thought,this was a pretty simple problem,based on the exhaust readings. with only 6 hc's on a major misfire i realized this was a fuel injection problem. using scan tool found ltft @ +25 on bank 1. i removed ... Trouble codes: P0300.
1998 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G2JB1244W
I tried disconnecting the battery overnight. No change. checked for vacuum leaks with smoke machine, none found. Could not get new throttle body. Customer did not want to put any more money into car. Thank you to all that replied. Trouble codes: P0507 (IAC Speed high).
1999 Chevrolet Tahoe LS 5.7L radio light VIN: 1GNEK13R0X
The best response was from Alvin, it was 13 volts and .60 watts. There are a few sources for these bulbs, Alvin has his source and Suburban Electronics is another. Pretty straight forward to replace, remove faceplate from radio, solder in all new bulbs.
2000 Chevrolet Venture 3.4L sliding door VIN: 1GNDX03E1Y
bad latch assy kept releasing and disenging contacts.
2002 Chevrolet Venture 3.4L Hesitation, Misfire VIN: 1GNDU03E02
thanks to everybody with your thoughts on this one.90% of you suggested doing a motovac.we did this twice and greatly improved the performance.the van did come back 5 days later with a code for just #2 cylinder misfire.we replaced #2 injector and all is good.c...
2003 Chevrolet Malibu 3.1L Poor Idle Quality VIN: 1G1ND52JX3
Iwant to thank all of you for taking your time to help me out,especially David,Lamar and Scott, you guys are right on time,A iac cannot bring engine rpm up to 4000 rpm,so i'm will refer customer to the dealer,recall nhtsa [...] for accelerator pedal binding... Trouble codes: P1122 (TP sensor circuit intermittent low voltage), P1554 (Cruise control feedback circuit).
2003 Chevrolet Suburban 1500 LS 5.3L A/C tentioner VIN: 3GNEC16T83
WOW iatn members do it again I had 20 replies and almost every one responded with sludging up of the compressor. as this compressor was only 6 months old I was concerned about what else I would find but I must have been lucky. I replaced the compressor again w...
2002 GMC Safari SLE 4.3L MIL Lamp on VIN: 1GKEL19X02
We have replaced the distributor gear, cam sensor, timing chain ,front cover , ignition wires, pcm, and nothing has helped. cylinder heads have been removed and guides and springs have been rechecked and all are good with no sign of scoring. we are removing th... Trouble codes: P0300 (random missfire), P0335 (testing and results).
1964 Oldsmobile Cutlass 330CID overheating VIN: 824M319106
Thanks to all who replied, very good information from all, Evidently we dont have as serious a problem as we assumed. Engine was bored .030 over causing some heat and of course the fuel quality today can also cause heating.
2000 Oldsmobile Intrigue GL 3.5L Mechanical VIN: 1G3WS52HXY
I have to close this post without resolvement it seems although I can add that I now have a plan of attack. The vehicle did return so I could inspect and replace the pcv valve due to the possibility of sticking and excessive suction. I discussed with the custo...
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