GM Automotive Technicians Technical Discussion and Fixes for Aug 2, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick Regal 25th Anniversary Edition 3.8L Gauge cluster, stall VIN: 2G4WF5210W I am currently studying wiring diagrams, and I think that an experienced GM tech may already be familiar with this problem, so I am asking to hopefully save time. The issue is that sometimes the engine will just totally shut down the instant the turn signal is...	View
	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...	View
	1959 Cadillac Series 60 Fleetwood 6.4L flexplate Hello Gentlemen, I am rebuilding the engine on this 1959 Cadillac, it had a bad vibration from 1500 rpm up, the original flexplate is bent and dented due to a catastrophic starter bendix failure in the distant past, my problem is identifying the correct flexpl...	View
	1991 Chevrolet C1500 Cheyenne 5.7L No Start VIN: 1GCDC14K4M I am the third shop to have this vehicle, and it's been tricky. I have no spark at all. There is throttle body injection. I disconnected the bypass to the computer, and there's still no spark. I checked the waveform on the purple/white wire, and got the 5v sq...	View
	1996 Chevrolet C1500 5.0L Hesitation VIN: 1GBEC14M1T 1996 chevy 305 came in poor idle and dies on heavy acceleration, distributor cant be coralated with crank if we get the offset degrees closer than 9 truck kicks back on starter and will not start. Other wise no codes pulled crank sensor timing chain not loose....	View
	1999 Chevrolet Blazer 4.3L ignition? VIN: 1GNCS13W4X I recently replaced a blower motor on this vehicle. When I did, I had to remove the MCM and in the process a couple of wires broke inside the connector. Before I found the problem, I replaced the MCM & the crank sensor. After I repaired the wires the truck sta...	View
	2002 Chevrolet Cavalier LS Sport 2.2L No Start VIN: 1G1JH52F92 This vehicle was an auction vehicle brought to me with alot of new parts and an intermittent stall/hard start. THIS POST IS JUST FOR REFERENCE VEHICLE IS FIXED. After days of no problem found the vehicle finally no started. The giveaway to this vehicles issue ...	View
	2002 Chevrolet Avalanche 1500 5.3L battery VIN: 3GNEK13TX2 Just got the vehicle back from dealer after reprogram due to replacing ignition lock cylinder and lock module (housing). The battery light and mileage light along with PRNDL light stay on after key off the vehicle. I disconnected the alternator connector; noth...	View
	2003 Chevrolet Tahoe LT 5.3L Pps VIN: 1GNEK13Z23 I have a sir code B0092. I have checked the under seat harness per the TSB. My information directs me to pull the PPS codes by flashing them on the rear view mirror. My problem is that the ON/OFF indicator will not light up in the mirror. The Tech 2 says "see ...	View
	2006 Chevrolet Uplander LS 3.5L abs warning lite VIN: 1GNDV23L16 have a 06 uplander that has both front wheel speed senors codes,c0035,c0040, at same time . checked harness , senors etc. ,,,problem is intermit ,,,could 1 sensor grounding causing both to flag codes ???	View
	2008 Chevrolet Impala LS 3.9L cooling system VIN: 2G1WS55318 Need advise from any GM service OR FLEET specialist,, we have these Impala POLICE vehicles, over heat sitting with AC on. ( no high speed fan opperation ) P/N [...] any one familure with these kits that add on relays & cut exsisting wires in the power distr...	View
	1996 GMC C1500 Sierra SL 5.7L Cuts out, Misfire, VIN: 2GTEC19R8T Hey guys , thanks in advance for replies. OK engine starts and idles excellent. Once in gear above or below OT it runs terrible cuts out , backfires,stumbles but if you continue to depress pedal at or about 65 to 75% throttle it comes completely alive and runs... Trouble codes: P0307	View
	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	View
	2003 Saturn Vue 3.0L fuel gaud]ge VIN: 5GZCZ63B53 this vehicle came into our shop with customer complaining of fuel gauge inaccuracy. we diagnosed faulty sending units. (unplugged reads zero plugged reads full. there are two units in tank and we replaced both. had found many complaints of failures due to gas ...	View
	2006 Saturn Vue 3.5L starting VIN: 5GZCZ53486 Last week a customer dropped off a 2006 Saturn Vue. The customer complained of the vehicle being hard to start and brought to us a starter to replace. Well once the vehicle was looked at it was found the starter is not the issue at all. The vehicle cranks fin...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1998 Chevrolet Express 3500 5.7L compressor VIN: 1GCHG35R3W Im closing this one for now, as the van is the owners work vehicle and he had to take it before I could investigate further. Im hoping to get it back at some point to finish the diagnosis. Most of the replies centered on the clutch air gap and the low and high...	19
	2005 Chevrolet Silverado 2500 HD 6.0L Timing chain VIN: 1GCHK29U75 Thanks to one and all for reading my post, and thanks again to the 13 that replied - I can state that this engine is indeed a valve bender if the cam stops turning. The final tally was one bent intake and three bent exhaust valves. All they lifters were remove...	13
	2006 Chevrolet Impala LT 3.9L MIL Lamp on VIN: 2G1WC58146 Well this one is fixed for now. Many thanks go out to Michael,Dan,John,Ennis & Richard. Ya'll said sender & it was. I knew I had oil pressure no noise. I was useing the Modis & saw 130psi I didn't understand. New sender shows 25 psi at idle,45-47psi @70mph on ... Trouble codes: P0522 (Eng oil pressure sensor signal low).	7
	1999 GMC Sierra 2500 SL 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTGK29U8X Thanks for the help and responses. I have never seen so many strange symtoms from a Engine module before. Replacing the PCM and reprogaming to vehicle cured all problems other than being very high mileage vehicle. No codes set voltages normal 13.5 running on d... Trouble codes: P0563 (PCM overvoltage).	6
	2007 Pontiac G6 GT 3.9L any forward gear VIN: 1G2ZH35147 Trans went out on this one. We opted for a GM trans and all is well. Internal electronics went out and it showed on the second test drive manual mode went out and it acted like 1st and 2nd engaged at the same time. Pop goes the weasel. Thanks guys	5

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