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Prev Professional Automotive Repair Technical Discussions for August 3, 2012
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Open Help Requests for GM
Help Request Answers
2005 Buick Terraza CXL 3.5L Lifters VIN: 5GADX33185
Customer showed up after about a 60 mile round trip with what sure sounded like more than one bad lifter. Checked oil pressure with a mechanical gauge and even though pressure was within limits, we installed new lifters and new oil pump and pickup. Started eng...
1978 Cadillac Seville 5.7L headlights
Headlights stopped working. Different headlight switch doesn't solve problem. Can't find good wiring diagram. Suspect Guide relay on firewall near master cylinder, can't find replacement or information to test it. Any information about this system would be app...
1997 Chevrolet C2500 6.5L Stall VIN: 2GCFC29S3V
customer complaint intrmitant no start and stalling no codes. found rail pump weak replaced pump ran and stalled starts right .never had a no start in the shop .
1998 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 2GCEK19R1W
Vehicle was towed in. Customer said that it would stall when it got hot and would restart with 5 to 10 min. but was getting worst to the point that i would not start at all. After tow truck unhooked went out and sure enough it fired right up. Drove it around t...
2000 Chevrolet Silverado 1500 5.3L Camshaft VIN: 2GCEK19T6Y
Greetings techs! This 5.3 Silverado was towed to us by the owner. It stalled while being driven. Checked a few basics and noticed that it cranked over too easily. Checked compression and found next to none on all cylinders. Removed a valve cover and none of th...
2002 Chevrolet Silverado 2500 HD 6.6L Compressor Inop VIN: 1GCHK23132
Help GM gods. This 02 2500 hd diesel work truck has been in operation for awile with a afermarket piggy back ecm tuner with diffrent adjustments, also 4 gauges. Well a/c stoped turning on. Manual a/c. So as a favor to a buddy. I hooked up gauges 120psi high an...
2005 Chevrolet Equinox LS 3.4L spark plug VIN: 2CNDL23F75
ok so got this equinox that lady asked if i could put her plugs in because husband told her to get then didnt wanna put in.Plugs are original ac plugs had miss cylinder number 1(backside under alternator).Started with frt plugs came out fine,went to #1 kind of...
2006 Chevrolet Uplander LS 3.5L programing used pcm VIN: 1GNDU23L06
This vehicle is a no start with a P0335 crankshaft position sensor circuit code. I put a lab scope on the crank sensor and the pattern is horrible. I cut the sensor wire and checked the signal and it was what it should be. I got a used computer and tried to p... Trouble codes: P0335 (Crankshaft position sensor circuit)
1989 Oldsmobile Cutlass Calais S 2.5L Excessive Emissions VIN: 1G3NF14D2K
At 15 MPH, CO2 12.1%, HC 48 (ppm) co 0.03% nOX 440 At 25 MPH, CO2 11.9%, HC 37 (PPM) co 0.01% Nox 816 AT 15 MPH Nox barely past. CUT POINT is 571 AT 25 MPH Nox fail, CUT POINT is 528 While monitor the test on manual mode, sometime the CO would go up about 0.... Trouble codes: N0NE
1999 Pontiac Grand Am SE 3.4L Emissions VIN: 1G2NE52E4X
Vehicle failed emissions on Nox only at cruise. No codes. HC limit 60 reading 10, CO% limit .33 reading .01, NO ppm limit 450 reading 1227. New walker cat, new O2's NTK, slight rough idle, commanded EGR open and ran rough, pulled Egr and throttle body off pass...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Buick LeSabre Limited 3.8L Poor Idle Quality, Cuts out, Stall VIN: 1G4HR54K34
Well thank you everyone for all the help. I am going to call this one fixed though I am not completely sure the exact issue. I was doing some reading on tsb's and there was one about battery going low due to prolonged idling with loads being on. I think that m... Trouble codes: P0101, B1327.
1991 Cadillac DeVille 4.9L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1G6CD53B2M
Would like to thank everyone for the help, replaced distributor and all problems were solved. thanks for the help!!!
2008 Cadillac CTS 3.6L MIL Lamp on VIN: 1G6DP57V98
pulled out the fuse box and opened it up. inside the fuse box was loaded with corrosion, replaced fuse box and cleared the codes. all is well thanks to everyone for the help. Trouble codes: P0100.
1988 Chevrolet C1500 Cheyenne 5.0L engine VIN: 1GCDC14HXJ
ok i hooked up smoke machine and performed smoke test and had vacum leak at booster line.repaired leak and test drove did a little fine tunning on timing and idle. truck runs great .
1991 Chevrolet Cavalier RS 3.1L Poor Idle Quality VIN: 1G1JC84T2M
Checked the injectors found some bad ones. Customer doesnt want to repair this gem...
1995 Chevrolet Monte Carlo Z34 3.4L engine VIN: 2G1WX12XXS
Thank you guys for your help on this matter. The problem on this engine is tha the camshafts gets too tight when the engine reach its normal working temperature. engine oil pressure is fine, there is no fuel or coolant leak into the combustion chamber and the ...
2003 Chevrolet Tahoe LT 5.3L Pps VIN: 1GNEK13Z23
Thanks guys. Michael from Florida led me to dig up wiring diagrams for the PPS Module. Once I had the pin outs for it I checked and had no power. The fuse was good but until I moved it around it did not make contact. Once I had power I did not have to look any...
2006 Chevrolet Trailblazer SS 6.0L No Start, Stall VIN: 1GNES13H96
HI, EVERY ONE. I APPRECIATE ALL OF YOU FOR YOUR HELP, ESPECIALLY JASON [...] AND WILLIAM ARTHOUR. THE PROBLEM WAS FUSE BLOCK UNDER THE HOOD , A NEW ONE TOOK CARE OF THE PROBLEM. THANKS AGAIN MATT Trouble codes: P1516 (Throttle actuator control), P1682 (Ignition 1 switch circuit 2), P2101 (Throttle actuator position performance), P0101 (Mass air flow sensor).
2006 Saturn Ion-3 2.2L 1-2 Shift VIN: 1G8AL55F06
Thanks for all the help. Removed the channel plate and the valve body in the car and replaced the input turbine speed sensor. The lady is happy. Thanks again, Micheal at Harrisburg Auto Service.
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