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Prev Professional Automotive Repair Technical Discussions for August 20, 2012
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Open Help Requests for GM
Help Request Answers
1991 Chevrolet C3500 Silverado 5.7L number 6 clyinder
Ok guys this one has me kind of stumped. I am not much of a internal engine guy to start with, but this truck is our companys tow truck, so were trying to get it going. Couple weeks ago I towed a car approx. 50 miles from our shop. never had a problem. the ne...
1997 Chevrolet K1500 Cheyenne 5.7L Brake Lights VIN: 2GCEK19R9V
Brake lights didn't work on this vehicle, has power in to orange wire on brake switch, no power out on white wire. Replaced brake light switch, lights stay on all the time with a new switch. Tried 2 AC Delco switches and 1 Napa switch with the same results. Br...
1999 Chevrolet Blazer 4.3L lack of power VIN: 1GNDT13W7X
Hi group, this Blazer has a weird noise coming from the top of the vortex injector plug mainly when warmed up, sounds like a heat shield noise, I'v replace the vortex for leaking many times on other vehicles but I never replaced one for a noise? Everywhere els...
2002 Chevrolet Silverado 2500 HD 6.6L Hard Steering VIN: 1GCHK23132
This truck came in complaining of hard steering in parking lots. Found only hard steering when brake pedal is depressed. Tried bleeding procedure from alldata for hydroboost and bleed P/S system. Still have issue of hard steering to the right and left when foo...
2003 Chevrolet Tracker 2.0L Readiness VIN: 2CNBJ13C73
Cat and Evap NOT READY. Service Bay Test NOT AVAILABLE. Never any codes. Battery disconnected during bodywork welding. Thermostat good, heats up quickly. IAT seems accurate. No Pending Codes. ALL "OK" in Mode Six Data. Customer did replace Cat and Exhaust with...
2005 Chevrolet Colorado Z85 2.8L No Start VIN: 1GCCS19845
This is my bosses nephews truck. He drove it into town and stopped at the store. He came out and it wouldnt start. Ive ohmed out the clutch switch, scanned for codes, jumped the relay to get the starter to work and it works when I manually work the relay. When...
2007 Chevrolet Equinox LT 3.4L stabiltrak VIN: 2CNDL63F77
This vehicle came to us after the battery being jumped backwards. this resulted in no power steering and the stibltrak, abs, and traction control lights all being on and about 20 u-codes. Once at the shop we found the 80 amp main fuse blown, replaced it and re...
2000 GMC Jimmy Diamond Edition 4.3L Hesitation, Cuts out VIN: 1GKDT13W0Y
Please help, tired of acting like parts changer. per our fuel psi tests all readings too low(58 koeo, 52 koer (idle), 56 psi koer wot. o2 sensors go to zero b1 26 b2 fuel trims way lean when accelerate heavy or wot. unplugged mass air flow although gm/sec rise... Trouble codes: P0131, P0135, P0143, P0151, P0300
2000 GMC Yukon SLT 5.3L Noise VIN: 1GKEK13T9Y
this has a noisy fuel pressure regulator. it buzzes. original regulator was replaced because it leaked into vac hose. first replacement regulator (Delphi) buzzed after cust had it a couple days. Second regulator also buzzed and leaked down when truck is shut o...
2003 GMC Sierra 3500 6.6L Stall, MIL Lamp on VIN: 1GDJK34193
Intermittent stall. Bad FICM? Truck came in last week for no start after an intermittent stall condition. Original code was P0335 Crank signal. Found bad connector at CKP. Soldered in new AC Delco connector. Test drove numerous times without concern. Customer ... Trouble codes: P0374 (Timing Reference Signal A No Pulses)

Fixes & Summaries for GM
Fix/Summary Answers
2007 Buick Terraza CXL 3.9L Steering
As I stated she refused to drive the vehicle so it went back to the dealer. One of the techs there drove it back and forth to work for over a week and problem did not reoccur now they are trying to come up with some kind of a trade.
1970 Chevrolet Monte Carlo 5.7L rocker noise
Than you all for an unprecedented response...As the engine came to me in pieces from the customer we failed to check closely enough for matching heads to block. the side to side movement of the rockers was due to the heads...these heads have a round hole for t...
1996 Chevrolet C1500 5.0L Hesitation VIN: 1GBEC14M1T
Thanks for all your, help, we found the crank sensor was advancing timing 50 degrees in crank only, replaced as service bulliten and were able to sync crank and cam, then we found the map sensor was staying at 14 inches always, replaced it and truck runs great...
2000 Chevrolet Tracker 2.0L Drl VIN: 1CNBJ18C7Y
2000 Chevrolet Express 3500 LS 5.7L Poor Idle Quality, MIL Lamp on VIN: 1GBJG31R3Y
The vehicle is fixed. The short answer is replacing the high side signal wire (terminal B) from the sensor to the computer fixed the problem. Now for a few details. Thanks to all who offered advice, especially to the one who suggested hooking up another sens... Trouble codes: P0174 (Lean Bank 2).
2005 Chevrolet Uplander LS 3.5L Rear back up sensor buzzer INOP VIN: 1GNDV23L95
Well it turns out that the after reading the codes out of the sonar system it needed a LR sensor and harness. The sensor was cracked behind the bumper and the harness wires were broken off inside the connector. I was initially confused by the lights blinki...
2000 GMC Safari SL 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GKEL19W5Y
Got the heads from machine shop and reinstalled. Runs great. I apparently had some valves sticking open sometimes. Valves had to be closed when I did the leakdown and compression test. Anyway thanks for all the help. Trouble codes: P0300.
2005 GMC Envoy XL SLE 4.2L Drivers side door module VIN: 1GKET16S95
John from Georgia had it. When picking the update I was under the impression the last one was the latest program. Also when highlighting them and reading the descriptions there was nothing that would of made me pick one over the other. Thanks to all who replie...
2007 GMC Canyon WT 2.9L Crankshaft Bearing VIN: 1GTCS14927
We replaced the cam actuator, and the code p0017 has not returned after 10 days of use. Therfore it is our opinion that .023 crank end-play is not enough end-play to set P0017. However I want to thank Justin from Oregon for the advice to check the front ex. c...
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