GM Automotive Technicians Technical Discussion and Fixes for Jul 20, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick LeSabre Custom 3.8L Alignment VIN: 00WH451071 hello group and thank you in advanced for even reading this got this 1998 buick came in the steering wheel was 45 degrees right while drivingbrought it in performed alignment with our hunter machine never had problem like this i go to test drive after the whee...	View
	1981 Cadillac Eldorado 4.1L electronic climate control head & MPG VIN: 1G6AL5799B this is a hard one half of the wires goes from mpg toECC are ok Ihave power &ground but doesnt come on please need some help	View
	1986 Cadillac DeVille Touring 4.1L Cuts out VIN: 1GBDC6980U The vehicle is a piece of junk, that being said here it goes. I put an alternator on the vehicle and got it to charge. Drove ok for a bit then let it go. Customer came and picked it up and now it runs very poorly. If you unplug the brown wire on the alternator...	View
	2002 Cadillac DeVille 4.6L Surge VIN: 1G6KD57Y92 This car has had 3 transmissions replaced over the past few years and customer says surge has been since then. This is a very very slight surge around 40-45 mph that most people would not even notice. My tech went for a ride and did not feel what the customer ...	View
	1993 Chevrolet Lumina APV 3.8L Excessive Emissions, MIL Lamp on VIN: 1GNDU06L9P excessive co, engine runs fine. will go to closed loop then open loop, stay mostly in open loop, if introduce vacuum leak, will will go closed then cycle. replaced o2 with delco unit, replaced coolant temp sensor, cleaned maf and inspected for vacuum leaks, no...	View
	1999 Chevrolet S10 2.2L Excessive Emissions VIN: 1GCCS194XX This s10 has a high NOx reading , the MAX Ca emissions is 533ppm . O2 sensor is active with good risetime , fuel control achieved . Fuel pressure Ok. cooling system Ok. No EGR Valve , timing unadjustable , I doubt that the CAT Has a problem because CO , HC are...	View
	2002 Chevrolet Venture 3.4L No Start VIN: 1GNDX03E42 Another stumper. This one will loose the fuel gauge, coolant temp drops below cold, abs light on, check engine light on. No communication with scanner. Engine will run untill turned off. Then it goes into a loop only intermittently.This may not happen for days... Trouble codes: U1000 (Class 2 communication problem history), U1040 (Ebtcm communications history), P1626 (Anti theft fuel enable circuit history), U1016 (Loss pcm communications only on air bag history)	View
	2002 Chevrolet Malibu 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G1ND52J52 This car came into the shop with a multitude of engine parts replaced (listed all known replacements below), but with DTC's still set for every system that had parts replaced. Battery was disconnected this afternoon, so I do not have a complete list of DTC's t...	View
	2007 GMC Sierra 2500 HD SLE 6.6L Door VIN: 1GTHK29D77 Owner continues to complain about a "tinny" sound that exists when shutting or opening the front door. The noise appears to be coming from the rear door. We have checked it twice now, and had the old door to recheck, however, no missing components, no abnormal...	View
	2001 Oldsmobile Aurora 4.0L Steering Gear VIN: 1G3GS64C51 Vehicle came complaining complete loss of steering for brief moment did not occur agian for two or three months does have two supension codes c1287/1288 replaced steering twice . First rack was leaking also vehicle does have magnasteer.this problem has been go...	View
	1994 Pontiac Bonneville SE 3.8L Cuts out VIN: 1G2HX52L7R Hi Folks, Me got's a brain nummer:-( This car will cut at times, not die but idle drops when it does happens at idle, mostly at part throttle. Fuel pressure stays steady and all the data on scanner looks good and no codes. Today it starts cutting out at idle m...	View
	2000 Pontiac Bonneville SE 3.8L security system VIN: 1G2HX54K6Y This car has two symptoms that, I believe, are related to the security system. First the engine won't crank unless I hesitate in the run position for a second. If I try to start normally it won't crank and code p1626 sets. Second when the code sets where is a ...	View
	2004 Pontiac Grand Am SE 2.2L Poor Idle Quality, Surge, MIL Lamp on VIN: 1G2NE52F24 Hi everybody, looking for some help here with this one. This grand am came in to us a week ago with a p0507 idle control system code in it. Customer stated that car was surging on her at stop lights and as she would take off from the light also, but not all th... Trouble codes: P0171, P0507	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick LeSabre Custom 3.8L No Start, Stall VIN: 1G4HR52L0R Hello all, first off thanks for all the great replies. Everyone seems to be on the same page with one of the three items (crank, ICM, ECM). I personally did not get this one fixed. I was at the point where I could not think or notice anything else so sent to a... Trouble codes: P0341, P1361, P1565.	35
	1997 Chevrolet K1500 Silverado 5.7L mode doors and a/c comp VIN: 2GCEK19R6V After extensive ohm tests found the high pressure switch on the back of the compressor shorted. Showing continuity thru both wires to the compressor housing. It can't have a ground to the A/C request line to the control. Also wiring to the switch(2 wire)was in...	3
	2001 Chevrolet Malibu 3.1L Theft system VIN: 1G1ND52J91 Thanks to all who read my request and tried to help. We ended up replacing the BCM on this car after re-cleaning the connector and verifying that the passlock voltage was consistent by back-probing @ the BCM on the wire from the cylinder. Also we determined th...	19
	2003 Chevrolet Suburban 1500 LS 5.3L Valve Train VIN: 1GNEC16Z83 We have opted to go with a Jasper reman engine with the 3yr/100k warranty. It is my opinion that the cam failed. The lifter was tattered around the edges of the roller but rolled freely The cam surface on the up side was torn up. I suspect failure was due t...	12
	2005 Chevrolet Silverado 2500 HD 6.6L steering VIN: 1GCHK23265 i would like to thank everyone that responded. Customer returned today and for some reason was happy with it. The one thing I forgot to post was the steering shaft u-joint was fine. When the tie rods were disconnected they weren't checked on the turntables,...	11
	2006 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 4362167165 Replaced upstream O2 sensor and code did not reappear for 3 days so Im calling it fixed. Sensor tested and performed 100% according to scan tool data and never set a code for O2. Trouble codes: P0411 (Air system).	11
	2007 GMC Sierra 2500 HD Classic SLT 6.6L Safety VIN: 1GTHK23647 the customer went to the fellow who reprogramed the computer... he set the tire pressures in the computer for 50 lbs and now the sensors reset ant every thing is fine	9
	2000 Pontiac Grand Prix GTP 3.8L Stall VIN: 1G2WR5216Y First of all, sorry for the bad info guys. I hate it when limited info is supplied. Unfortunatly in the predicament i only had access to internet and no diagnostic equip. After some testing, found the fuel pressure was running off after it would get started, ...	8
	2006 Pontiac Torrent 3.4L Evaporator VIN: 2CKDL73F06 Thank you all for the responses and the great ideas. Kent, Robert and Gerry were all on the right track. The compressor was not cycling off. It was staying on and making the system so cold that the low pressure line(from the expansion valve)was freezing ...	10

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