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Prev Professional Automotive Repair Technical Discussions for April 13, 2011
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Open Help Requests for GM
Help Request Answers
1967 Chevrolet Camaro 5.7L Mechanical VIN: 1236774454
We have camaro with brake disc conversion and front left caliper locks up after a few pumps of the brake pedal we had noticed a button on the end of proportioning valve and pressing this releases the caliper so we replaced valve problem remained so we repalce ...
1988 Chevrolet Camaro Iroc-Z 5.0L Cooling fan(s) VIN: 1G1FP21F3J
This vehicle has two cooling fans. The main one runs as soon as the engine is started (not KOEO though). The ECM grounds the relay to turn the fan on, I pulled this wire out of the ECM connector and the fan does not run. There is no ground on the wire otherwis...
1997 Chevrolet Blazer 4.3L Cuts out, Misfire VIN: 1GNDT13W7V
Hello all... I have a customer that "wants answers NOW!!" This vehicle appears to be an auction vehicle that was there for a reason and the owner thinks it's a gem! Original complaint was that the starter nose bad cracked. This appears to be from a timing issu...
1998 Chevrolet K2500 Silverado 7.4L cylinder wear
Original engine replaced around 140,000 miles during summer 2009 at aftermarket shop with GM target engine due to oil consumption. Oil consumption issue returned after 3,000 miles. Aftermarket shop advised owner to take to dealer for warranty consideration. Th...
2001 Chevrolet Impala 3.8L no upshift VIN: 2G1WH55K91
Hi guys, thanks in advance. This is my grandfathers Impala. Recently he complained of a late or harsh upshift intermitantly, and wanted a trans service (old mechanic). all was well for a month or so, then he noticed it agian, but couldnt remember what gear it ...
2002 Chevrolet Blazer Xtreme 4.3L Misfire VIN: 1GNCS18WX2
This truck came in with a missfire and ses light on. Code p0300 found but only #6 had any miss counter. Replaced dist cap, rotor, wires and plugs. All were original. By then the thing had cooled down and it ran great long enough to get half way around the bloc... Trouble codes: P0300 (missfire)
2003 Chevrolet Tahoe LS 5.3L water seal VIN: 1GNEK1Z34Z
Customer complains of water leaking on her feet when driving only when its raining. We can find no leaks but did see were her carpet is soaked. She had the windshield replaced but no leaks were found from the windshield tech during the replacement it hasent ra...
2005 Chevrolet Classic 2.2L power door locks VIN: 1G1ND52F75
this vehicle came in a couple weeks ago with intermitent symptoms such as power door locks sometimes not unlocking as you park and turn key off,also has some sort of continous chime type warning that can be persistant at timeswith no indications as to what the...
2009 Chevrolet HHR LT 2.2L Ignition Lock Cylinder VIN: 3GNCA23B39
This vehicle came in with a complaint of engine will not shut off, runs real bad and key won't come out. Found a whole string of fault codes every where. Removed igntion lock cylinder and found where plate covering tumblers had come off and spring were every w...
1995 GMC G2500 Vandura 5.7L wiper switch VIN: 1GDEG25K9S
wipers quit working after snow fell on one blade & pushed it down over the hood. released blade from post checked the teeth all look ok so installed in right position turned on the key turned wipers on-nothing. checked wires on bottom of column had 12v on whit...
2002 GMC Sierra 2500 HD SL 6.6L Poor Idle Quality, Surge VIN: 1GTHK231X2
posting this for a friend who is looking at purchasing this vehicle. i don't know much about these diesels. he says it has alot of black smoke coming from exhaust and it surges at an idle. i checked archives but didnt see any posts about this problem. he said ...
2002 GMC Yukon Denali 6.0L No audio VIN: 1GKEK13Z02
Hello everyone and thanks in advance. This is my inlaws car so hopefully that gets my some sympathy. I have no audio and no power to any of the speakers, the radio controls work properly and the rear headphone unit produces audio. I disconnected the rear 2 spe...
2003 GMC Yukon Denali 6.0L MIL Lamp on VIN: 1GKFK66U73
after changing the MAF with 4 NEW ones the readings ( trim ) get worse , I put a "test" unit in and it goes to 12-16 % LT 0 % (+-) 4% ST . is there a new PCM calibration for the new MAF units ?? unfortunately my "test " unit fails when hot ! Trouble codes: P0171, P0174
2007 GMC Sierra 1500 SLE 5.3L charging guage VIN: 1GTEK19J97
I have this 07 gmc sierra with an intermitant voltage droping down to 9 volts on cluster when driving.Can not ever duplicate in shop or on road test.Charging system always tests good when here.No DTCs.Customer says it happens every few days very briefly.Truck ...
1999 Oldsmobile Silhouette GL 3.4L A/C Fuse VIN: 1GHDX03E1X
Vehicle came in overheating, replaced head gaskets and resurfaced heads. Everything working fine when vehicle left. Two weeks later it came back with ac compressor not working. Found blown fuse. Replaced and found out that compressor runs and at end of cycle i...
2010 Other GM H3 3700CC Transfercase VIN: ADMDN13E18
I have a problem with this vehicle, the "serv 4 wd" is appear in a combination meter, before the message appear, i try to pull out the junction blok on the left engine compartment, and i istalled again in a few minutes, but when i try to on the ignition, the j...
2000 Pontiac Grand Prix GT 3.8L No Start, Cuts out VIN: 1G2WP52KSY
The car came in with a frequent no start complaint. The customer got it running and drove it in. I was able to drive it into the shop before it began to act up. I only took a couple attempts to identify the problem as a Pass Key system problem. The key I was l...
2006 Pontiac G6 2.4L No start VIN: 1G2ZG58B47
Ok I am pulling my hair out on this one! The car was towed in on a no start. I verifyed customer complaint and it wont start. Pulled codes and it has a P1682 Ignition 1 Switch Circuit 2 problem. so i checked fuses and they are all good. checked voltage at ect ...
2006 Pontiac Torrent 3.4L abs VIN: 2CKDL73F06
acts like Chevy trucks here in the salt belt

Fixes & Summaries for GM
Fix/Summary Answers
1988 Buick Electra Limited 3.8L Surge, Cuts out, Stall, Lack of power VIN: 1G4CW51C1J
what a great group of tech's..thanks for all your help.. runs great now,removed & cleaned the MAF and the Oring fell off,did not know until I removed the MAF and rechecked my steps,looks like a dirty MAF was the original problem, without the Oring it was sucki...
1996 Chevrolet K1500 Silverado 5.0L Poor Idle Quality, Misfire, No power VIN: 2GTEK19M8T
Well if the idea of this organization is to generate ideas and thought, it sure is a resounding success. Having been under the assumption that the "spider" assembly had been replaced at the other shop, after removing the cover, I found that it was the old one ... Trouble codes: P1345 (Cam timing issue).
2001 Chevrolet Silverado 1500 4.8L can't complete obd2 VIN: 1GCEC19VX1
2006 Chevrolet Silverado 1500 HD LT 6.0L steering wheel VIN: 1GCGK13U76
after a thorrow steering inspection and finding no play anywhere the steering box was adjusted ,which did help some.we are going to blame this on tires .so know this is really not fixed but i am sure new tires will be the cure.
2008 Chevrolet Cobalt LT 2.2L power steering/HVAC VIN: 1G1AL58F58
after calling the dealer with the vin ,found out that the power steering motor has been changed but not the module, inspected wires behind radio and hvac and they appeared to be in great condition and never blew another fuse during an aggressive wiggle test an...
2002 GMC Envoy SLT 4.2L MIL Lamp on, Reduced Power Light VIN: 1GKDT13S52
I tried replacing the terminals at the PCM and that did not help. I also replaced the PCM since the wiring tested out good and the APP and the Throttle Body was new and GM parts. I finally ran new wires to the APP and Throttle Body and drove it extensively a... Trouble codes: P1523 (Closed Throttle Performance), P1271 (APP 1-2 Correlation).
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