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Prev Professional Automotive Repair Technical Discussions for April 22, 2013
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Open Help Requests for GM
Help Request Answers
1996 Cadillac Fleetwood 5.7L low power/vacuum VIN: 1G6DW52P8T
Customer complaint is low power and check engine light on. The fuel pump solved part of the low power problem, but it is still weaker than I would like to see for an LT1, and it is continuing to set lean codes. I also have an evap problem, but I have isolated ... Trouble codes: P0171 (lean bank 1), P0174 (lean bank 2), P1171 (lean during acceleration)
1995 Chevrolet Camaro 3.8L neutral safety
this car fails a provincial/state safety inspection because it will start in all gears. I see from the wiring diagram there is a theft relay in series with the neutral safety switch. there is no power at the yellow wire at the switch I assume its been bypassed...
2001 Chevrolet Silverado 3500 6.6L Engine VIN: 1GCJK33161
Hi everyone, this is my first experience with a mechanical issue on one of these Duramax engines and looking to be pointed in right direction, Customer was driving in town and all the sudden engine died and will not restart, he had looked at by dealer in that ...
2004 Chevrolet Colorado LS 3.5L ignition VIN: 1GCCS13684
this car was driving and all of sudden stop, and anti-theft security lite is on, now starting the car again, it wont, i have tried to relearn the key by rotating the key in manual learn mode, but wont start, the car crank alright, all lights on the instrument ...
2006 Chevrolet Trailblazer LT 5.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNES13M56
Customer purchased vehicle couple months ago, ran fine until 2 weeks ago. Started running very rough returned it to person who installed engine. He had it for several weeks and said he did not know what was wrong with it. So we have it, clear codes and while c... Trouble codes: P0016 (p0341-), P0341
2007 Chevrolet Aveo LS 1.6L Stall VIN: KL1TD56647
customer came in said his car would just stall while driving down highway and wouldnt go over like 20 miles a hour he said even when he was driving like 60 it would be like cut car off cause it wouldnt go it doesnt die just wouldnt go ive drove it and it hasnt... Trouble codes: P2106 (throttle control systemperformance), P2110 (tac systemforce limted speed), P2101 (motor circut and performance), P0106 (map out of range), P0420 (cat effncany low bank 1)
2007 Chevrolet Uplander LS 3.9L Cooling Fan VIN: 1GNDV23WX7
Greetings to all van came in foe overheating found cooling fan not coming on able to activate through scan tool on all speeds.ecm controls ground circuit at relay should come on at low speed at 208 degrees and at high at 220 degrees ran vehicle and noticed tem...
2008 Chevrolet Suburban 1500 LTZ 5.3L Engine VIN: 3GNFK16388
The customer brought the suburban in for a no start and a chirping noise. The battery is bad for starters. The noise is at idle and gets faster with engine rpms. I can hear it the best on the passenger side rear on the engine block. we removed the belts and th...
1985 GMC Caballero Amarillo 5.0L MIL Lamp on VIN: 3GTCW80HXF
Afetr the repairs and install, with putting some time into restoring the car, We ried to repair the A/C idle relay circuit with installing a after market raly and harness, Had the car running with checking feedback and interfacing the ECM. No problems then hoo...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Chevrolet Corvette 5.7L Poor Idle Quality, Surge VIN: 1G1YY3384L
Thanks for all the help, Replaced the Intake gasket and started the engine, it ran perfect. I went for an extended test drive and everything was good, scan data was all in normal ranges, including fuel trims(block learn and integrator). After the vehicle sat...
1998 Chevrolet K1500 Suburban LS 5.7L Torsion Bars VIN: 1GNFK16R1W
Thanks to all of you who responded, I am amazed by the number of replies! Several people said that I could use a large c-clamp or a ball joint press to compress the adjusters on the torsion bars but the majority said that I wouldn't need to remove the torsion ...
2002 Chevrolet Impala 3.4L power steering rack VIN: 2G1WF52E12
Hi Everyone, Well, after the third power steering pump it seems to have fixed it. We wanted an oem part at first but the pump was 320.00 at the local dealer. Just stupid. Found a rebuilt ac delco. It has not come back.
2008 Chevrolet Silverado 1500 LT 5.3L No Start
Well Thanks for the replies. I inspected the flow control module and it looked okay, so I was able to remove driveshaft and get to the tank and disconnect electrical. Tested the power and ground circuits and they tested good. So them I removed pump, to my surp... Trouble codes: P069E, P0231, P0446, P1174, P0573.
2003 GMC W3500 Forward W3S042 5.7L hydraulic VIN: 4KDB4B1R53
Thanks for the help. The customer sourced a used controller, installed, bled and now have an acceptable brake pedal height.
2005 GMC Envoy SLE 4.2L Powertrain VIN: 1GKDT13S55
Hi There, It was the Electric Cooling Fan with an intermittent short in it that would drop the 5 volt reference at times. Thanks for all the help from everyone. Mike
2005 Other GM rodeo 3.0L Excessive Emissions, Hesitation, Surge, MIL Lamp on, blows white smoke VIN: MPATFS77J5
Thanks to all technicians that replied all good suggestions.After draining and cleaning the tank and replacing filters a second time i rechecked the banjo fitting to the pump.The filter screen had a bit of rubbish in there.I cleaned the screen filter and blew ... Trouble codes: P0216.
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