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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 16, 2011
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Open Help Requests for GM
Help Request Answers
2003 Buick Century 3.1L Misfire VIN: 2G4WS52J93
I have a regular customer with a car i have never seen. Came in for engine runs rough and check engine light. Monitored misfire data and notice cylinder #1 misfiring. I swapped a wire and a plug and nothing changed. But when i took the plug out i noticed that... Trouble codes: P0300 (Engine missfire detected)
2004 Cadillac DeVille 4.6L Red Brake Warning Light VIN: 1G6KD54Y24
Good day to all. I have this issue with the brake warning lamp on the instrument cluster. The information center is saying check brake fluid level. The fluid level is good, its probably a little past the max mark on the resevoir. The only electrical testing Iv...
1989 Chevrolet S10 2.8L Manual Low VIN: 1GCCT14R6J
This is a 700r4 and trans was rebuilt and sk-700 jr kit installed. It worked fine for about a week, now its seems to be stuck in 3rd gear and will bind up and not move when shifted to manual low, reverse is fine. Any ideas would be appreciated before I pull it...
1999 Chevrolet K2500 Suburban 7.4L Lifters VIN: 1GNGK26JXX
The lifters on this motor will not stay pumped up after sitting for 6-12 hours. Customer drove truck for 5 miles, let sit for and hour and upon restart had a loud rattle (we replaced intake gaskets/ oil and filter--300 miles previous to rattle) Had towed in an...
1999 Chevrolet Astro 4.3L Excessive Emissions, MIL Lamp on VIN: 1GNDM19W7X
This vehicle have a issue for emissions it will not set the cat monitor to run for some reason it will not run is there something that im missing with this p0146 code ?. Trouble codes: P0146
2001 Chevrolet Silverado 3500 6.6L No Start, no injector pulse VIN: 1GDJK34171
Good evening everyone, Vehicle had weed killer put in tank by accident, ran until it quit, tank topped off with diesel fuel, didn't start, was towed to a shop elsewhere that told them motor was shot after fuel system was cleaned out. Customer installed used m... Trouble codes: P0380 (Glow plug circuit), P0540 (Intake air heater circuit), U1000 (Class 2 communication fault)
2003 Chevrolet Silverado 2500 HD 6.0L MIL Lamp on VIN: 1GCGK13U73
We have replaced the throttle body, throttle body control module,(on the firewall behind the master cylinder), and we replaced the PCM and reflashed with up to date programming. We have gone through all the wiring connections and connectors in the system. We h... Trouble codes: P2135
2003 Chevrolet Silverado 2500 HD 6.0L MIL Lamp on VIN: 1GCHK29U73
Here's a good one guys. The MIL lamp will come on and flag a 1432 when the van is accelerated hard. The fuel tank pressure and level sensor signal, power and ground wires can be monitored with DVOM's with glitch capture and never fall out of specification. The... Trouble codes: 1432 (Fuel Tank Pressure Sensor)
2004 Chevrolet Silverado 1500 5.3L Noise VIN: 2GCEK19T44
Truck has a vibration under hood that resonates in the dash if you power brake the engine and hold rpm at 800-900. Ive heard this on many gm trucks of this vintage but never had to fix. Any help would be appreciated.
2007 Chevrolet Tahoe LS 5.3L Poor Idle Quality, Surge, MIL Lamp on, Low power VIN: 1GNEC13J37
Checked Identifix for related issues to code and for TSB's; none found. Scoped Cam/Crank waveforms; according to the code description in aldata, the Cam trailing edge, does not say which one, is 36deg from TDC on #1; the closest is the rising edge on the secon... Trouble codes: P0016 (Cam/Crank correlation error.)
2004 GMC Envoy XL SLE 4.2L torque convertor clutch VIN: 1GKET16S34
Hello gentlemen, this 04 envoy acts like it needs a reflash, but I can find no new calibration to fix this intermittent TCC lockup problem. As long as you drive 70mph or faster the slip rpm is less than +5. At 69mph or below the convertor goes in and out of l...
2008 GMC Yukon Denali 6.2L Ac VIN: 2GTEK63868
A/c freezes up after driving. Replaced orifice tube, cycling switch,high pressure sensor, control head, charge system a few times with different amounts. Pressures will read a little low on both sides when it freezes up. Turn it off and let it thaw out and it ...
2008 GMC Yukon SLE 5.3L Valves VIN: 1GKFK13058
Truck is back with a tapping/squeaking noise around cylinder 5. We do not have the tool to check oil pressure at this time, oil gauge shows to be normal. Intake vacuum is good. We also checked exhaust for vacuum and did not find any.
1989 Pontiac Firebird Trans Am 5.0L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: F1KL214282
i have this trans am that will drive down the road first then when trying to go in closed loop pretty much dies out when giving gas mass air flow voltage all over the place. ohm check injectors they go from 7.6 ohms to 17.3 ohms at 68 degrees. alldata says the...
1998 Pontiac Sunfire SE 2.2L No Start, Stall VIN: 1G2JB5243W
This car was brought to us for start and stall within seconds. Found 2 DTC P1629 and U1016. We were able to get vehicle to start if you turned the key in a certain position. Replace Cylinder lock with sensor and key, reprogrammed key. Vehicle will still not st... Trouble codes: P1629 (Theft Deterrent System Fuel Enable Circuit Incorrect Signal Detected During Crank.), U1016 (U1016 - Loss of Class 2 Communication with VCM.)
2001 Pontiac Aztek 3.4L Misfire VIN: 3G7DA03E11
I have a 5th cylinder misfire at idle, and none of the obvious causes seem to be the culprits. I get it above 1500rm and it runs perfect. I'm hoping some of you guys maybe have had experience with these 3400 Aztec motors and can give me an idea or two. I reall... Trouble codes: P0304 (Misfire)
2004 Pontiac Grand Prix GT1 3.8L No Start, Stall VIN: 2G2WP52264
I have a intermittent stall and no start. The car had no ryme or reason to when it stalls, sometimes it will go for 3 weeks without stalling and sometimes i will stall 3 times a day. When it stall it is losing injector pulse,spark and cranking rpm's. We have r...
2006 Saturn Relay-3 3.5L intermittent VIN: 5GZDV03196
Good afternoon and AAAAAAYYYYYUUUUUUGGGHHHHHH!!! Another gift from the gods of handling someone elses comeback!!! I have this Saturn Relay that was serviced by another shop that our owner has and was supposedly 2.5 quarts low on trans fluid, then driven to Orl...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Chevrolet K2500 Suburban 7.4L Poor Idle Quality, rough idle VIN: 3GNGK26J1V
2006 GMC Canyon SL 2.8L ignition key VIN: 1GTDT19646
This vehicle has an Invers motor vehicle pool GPS unit installed in it and it looks like the processor of this system was drawing current and causing wierd things with the BCM.
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