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Prev Professional Automotive Repair Technical Discussions for October 17, 2011
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Open Help Requests for GM
Help Request Answers
2006 Buick Terraza CX 3.5L cruise control VIN: 5GADV23L66
the cruise works only while there is an abs fault, and the abs is dissabled, the stop lamp voltage does not change between the two conditions (2.5vdc engine running pedal released and charging voltage depressed 14vdc, and the brake lights work properly). Corre...
2007 Buick Lucerne CXL 3.8L ABS Light VIN: 1G4HD57236
We are dealing with a ABS light that comes on about once a week on this Buick. It sets a code C0045 LR wheel irratic. It will go out when the car is shut off and store in history on the scanner.We have tried both rear bearings and a new harness.We have never h...
2004 Cadillac Escalade 6.0L Oil Pressure VIN: 1GYEK63N43
Ok I have drove myself and shop crazy on this one. There is Oil Pressure at the filter with the oil filter pressure adapter from GM. At the sending unit plug there is only 2.5 psi on warm start and about 5 psi on cold start. According to the lubrication flow s...
1974 Chevrolet Corvette 7.4L brake light on when pressing brakes VIN: 1Z37Z4S421
hello guys i have a 74 chevy corvette 454 stingray for the brake light on cluster on. after checking the vehicle found that the proportioning valve was leaking and that was my brake light, but now that i replaced it and bled all corners the brake light still c...
1985 Chevrolet S10 Tahoe 2.8L Poor Idle Quality, Flooding VIN: 1GCDT14B8F
Truck ran poorly with no accelerator pump performance, vacuum leak at brake booster, weak choke heater, and fuel pump only capable of 12" hg and 4 psi. Installed new booster, fuel pump and filter, overhaul carburetor with Hygrade service kit. Now the truck wo...
1994 Chevrolet S10 LS 4.3L High idle when cold VIN: 1GCDT19W8R
Vehicle has high idle when started cold. Indicating 1200 to 1300 RPM when started in cold condition. When started in warm or hot condition, problem does not exist. The high idle is only found when the vehicle is started in the morning or in the evening. Owner...
1997 Chevrolet Express 1500 5.7L Hesitation, MIL Lamp on VIN: 1GBFG15RXV
Came in for check engine light.customer was out of town when the light came was diagnosed as needing fuel pressure regulator.after repairs light came back on within 20 miles so customer drove it home and here it is.fuel pressure running is at 49 psi 58 k... Trouble codes: P0171 (Fuel trim lean), P0174 (Fuel trim lean)
2004 Chevrolet Silverado 1500 5.3L Right rear axle seal VIN: 1GCEK19T04
Hello everyone. The mechanic who originally replaced the rear axle seals back in January 2011 no longer works here, so I'm looking at this for the first time. This is a work truck and it failed the State Inspection for leaking rear axle seal on the right side....
2005 Chevrolet Equinox LT 3.4L MIL Lamp on VIN: 2CNDL23F35
We thought we had it fixed went two weeks than light came back on with same code p1133 we did a smoke test before and did repair vac leaks at egr base gasket and pcv pipe to valve. Trouble codes: P1133 (Insufficiant switching)
2007 GMC Acadia SLE 3.6L No Start VIN: 1GKEV33757
Intermitently vehicle will have a security light with a code U0168 (loss communication with IPC/security), but it starts and runs, However if you put the key in the door and lock and unlock it to try and clear the code then it won't start. (customer finally to... Trouble codes: U0168
1972 Oldsmobile Cutlass 5.7L signals VIN: 3J57K2Z105
Greetings fellow techs. Hoping somebody out there may have a wiring schematic for signal light switch connector under steering column. A jumper harness has been installed between the two connectors and the wires were out of the connector on the column side. I ...

Fixes & Summaries for GM
Fix/Summary Answers
2004 GMC Envoy SLE 4.2L Hesitation VIN: 1GKDS13S44
I absolutely hate when I can't nail down a problem, however I feel very informed on the Engine System on the 4.2L. After about 30 hours of checking and rechecking, I could not locate the issue. The customer decided to trade the vehicle in the way it was. What ...
2002 Pontiac Firebird Trans Am 5.7L Poor Idle Quality, Stall, MIL Lamp on VIN: 2G2FV22G92
So it was a broke valve spring. As an import tech 90% of the time it isn't something I've ever seen or would think about. Though it wasn't a tapered end spring, which from all I've read, means it was not a stock spring. I just can't believe a V8 ran that bad ... Trouble codes: 300 (random).
2003 Pontiac Grand Prix GTP 3.8L Ebcm VIN: 1G2WR52163
thank you all for your replies, it was a big help even though we did not rectify the problem. I checked the problem areas like rubbed through wiring harness on the transmission and looked for any evidence of water or corrosion on the ebcm and pcm. We appreciat...
2004 Pontiac Grand Am SE 2.2L No Start VIN: 1G2NF52E94
The no start was caused by the cam sensor. We did not fix this vehicle, though. We told the customer we did not have time or resources to fix this vehicle. We were leaning toward the PCM, since there was no signal from the pcm, crank signals were good. He towe...
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