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Prev Professional Automotive Repair Technical Discussions for May 29, 2015
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Open Help Requests for GM
Help Request Answers
2007 Buick Lucerne CXL 3.8L no power from ignition switch to starter VIN: 1G4HD57267
we have this 07 buick lucerne 3.8 at times it will start wile running engine will shudder and stall then no start we powered pull wire to starter and starter will engage with key on engine cranks but no start condition scanned for codes no codes help!!
1992 Chevrolet Corvette 5.7L Hesitation, Cuts out, Misfire, pinging VIN: 1G1YY23P4N
Came in with a bad (dead, non-op) ignition control module and an intermittent runnning out of power climbing long hills complaint. Replaced the ICM and went on an extensive road test where I got the vehicle to act up. It would buck, jerk and ping. It would som...
1995 Chevrolet K1500 Silverado 5.7L 2-3 shift
Hoping someone can give some guidance. Got a 4L60e that I just overhauled for slipping reverse and 2-3 shift problems. The low/reverse clutches were wasted. I expected to find the 3-4's gone as well but they were intact. Went ahead and built the unit and took ...
1996 Chevrolet K1500 Cheyenne 5.7L MIL Lamp on, VIN: 1GCEK19R1T
Customer's complaint was Speedometer and cruise don't work and transmission not shifting intermittently. Found that PCM data showed no VSS speed until engine warmed up, then it would start working. Scoped VSS signal and found 5 volts on VSS signal wire on star... Trouble codes: P0161 (O2 heater circuit Bank 2 Sensor 2), P0500 (VSS circuit), P0502 (VSS sensor low/No signal)
2001 Chevrolet Impala LS 3.8L control VIN: 2G1WH55K71
complaint: A/C stopped blowing cold at the exact time the temp guage dropped to cold while driving on hwy. Vehicle was completely warmed up . Called for appointment. Next day called and said Check engine light came on. Code was coolant temp sensor . Sensor was...
2002 Chevrolet Trailblazer LS 4.2L Starting VIN: 1GNDT13S52
Engine will start and run for about 2 seconds like a theft problem-however it is not!!-I have no front power windows,radio,door locks-however those will work when the engine is running for about 2 secs-they stop working as soon as the engine stalls-only code i...
2004 Chevrolet SSR 5.3L top, windows VIN: 1GCES14P54
Customer has three different complaints. 1. when stepping on throttle hard the oil pressure drops to zero, it will do this on cue for me as well and you don't have to be moving. The instrument panel throws a loss of oil pressure code. I believe this is the pre...
2008 Chevrolet Silverado 2500 HD WT 6.6L Cuts out VIN: 1GCHK29638
changed fuel filter with dealer oem filter and primed by cracking bleeder screw and pumping primer until solid flow of fuel from bleeder. test drove and vehicle runs out of fuel on hard acceleration. on snap on verus fuel pressure command is 180 with actual dr... Trouble codes: 0087 (low fuel pressure in rail)
2002 GMC Envoy SLE 4.2L Windows, Seats, Door locks
GM Tech's This is a new one! The customer installed a dealer supplied GM instrument cluster. After installing it he had no power windows, seats, radio, most of the cluster was...dark. He called me to program it. When I got to the "site" I found myself down in ...
2007 GMC Sierra 3500 Classic SLT 6.6L motor VIN: 1GTHK33D87
Tapping noise from engine area all the time. Noise does seem at time to be very little after warm up. Vehicle runs fine. Does not misfire or smoke. Noise is not a double tap as when injectors are going out. I ran my scanner and tried to cancel and isolate the ...
2007 Pontiac G5 GT 2.4L Extended crank time VIN: 1G2AN15B97
Swapped engine with used. Original engine overheated to the point of melting the intake manifold studs through the manifold. When we installed the replacement engine the ckp plug was damaged. We repaired the end and got the used engine started fine, the tachom... Trouble codes: P0355

Fixes & Summaries for GM
Fix/Summary Answers
1995 Chevrolet Lumina 3.1L High idle VIN: 2G1WL52M9S
We let the vehicle go without replacing any parts. We tried a base idle relearn and it brought it down 80rpms. There is no vacuum leak external or internal. The ECM is commanding this idle and its a mystery why because the customer is fine with the way it is. ...
2004 Chevrolet Trailblazer EXT LT 5.3L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1GNET16P74
thanks guys a few of you were on point i swaped o2 wiring on primary sensors and it fixed it and all reading are good now truck been doing good for a week now thanks to all who replied Trouble codes: P0300.
2008 Chevrolet Tahoe LTZ 5.3L Poor Idle Quality, Hesitation VIN: 1GNFC13078
Thanks for all your help. I didn't want to put 12v to a wire on a vehicle i'm not too familar with. So, i removed the fuel fill hose from the tank, snaked a 3/8" hose into the tank, added a battery operated fuel pump, and drained it into a 55 Gal drum. Took ab... Trouble codes: P1174.
2008 Chevrolet Silverado 1500 WT 5.3L Coolant in the oil. VIN: 1GCEK19098
Thank you for all the replies. Since we posted this help request we have added dye to the coolant system and pressure tested the system overnight then removed the valve covers and checked around the head bolt bosses and found no residue. Then we also pulled th...
2008 Chevrolet Express 1500 5.3L No Start VIN: 1GCFG15438
Thank you for the replies. Had new key made because customer couldnt find extra master key . Tried several times to do 30 relearn with new master key i had made and wouldnt work. It would show transpoder key present but would do relearn . Timer worked on scan ... Trouble codes: B3055, B3935.
2012 Chevrolet Express 2500 4.8L MIL Lamp on VIN: 1GCWGFCA8C
Vehicle went to dealer. Have not heard back. Thanks for ur help. Trouble codes: P0173 (Syst rich).
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