iATN Member GM Auto Repair Tech Exchange for May 7, 2008

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Open Help Requests for GM

	Help Request	Answers
	2008 Buick Enclave 3.6L sir Hello everyone, I've got a tough one here. The vehicle is a 2008 buick enclave. It came to me from a body shop after a collision repair.The sir light was on the dash. The air bags deployed,so I replaced the sdm and programed it through tis2web with a tech 2 sc...	View
	1998 Cadillac DeVille 4.6L steering this car is showing the warning " service steerring system " it has the c 1241 code and the diagnosis routine followed step by step conduct to replace ebtcm . caddy experts : is a common failure on this vehicles the ebtcm defective causing this code ? we nee...	View
	2001 Cadillac DeVille 4.6L Poor Idle Quality, Surge car surges at idle up and down and sometimes surges hard enough to die out. seems to be worse after it warms up. smoke tested and found a leak at the boot that attaches the throttle body to the intake, went ahead and replaced the boot and intake gaskets. still...	View
	1996 Chevrolet Caprice 5.7L Poor Idle Quality, Surge Hello everyone. I have a 1996 Impala SS 5.7/auto(caprice) that has an intermittent rolling idle problem. It will sit and idle fine around 700 rpm and then without cause start to surge up to 1000-1200 rpm. The problem will happen cold, hot, in gear and neutral....	View
	1996 Chevrolet Pickup 5.0L Excessive Emissions, Hesitation This truck came in with symptoms of intermittent run rough, idles low and almost stalls. Sometimes doesn't happen a few days in-between. Customer says problem only lasts a few seconds. Of course I can't get any of the symptoms to occur. The tps sweeps good a... Trouble codes: p0122 (Tps CKT), p1122 (Tps low volts), p0172 (rich bank1), p0175 (rich bank2), p1406 (egr pintle position), p0748 (Pressure control solenoid problem).	View
	1997 Chevrolet S10 Pickup 4.3L Hesitation with the genesis scan tool hooked up,stft is fluctuating just above and below 0. after runtime of approximately 5-10 minutes stft strats increasing on plus side to around 50 both banks. prior to this you could stomp gas pedal to floor and engine revs normally,... Trouble codes: P0131 (o2 sensor bank 1 sensor 1 low voltage).	View
	1997 Chevrolet Cavalier 2.4L Heater Core This Cavalier is on it's 3rd heater core failure. They seem to last about 2-3 months. The last one was a factory part. During the last replacement we added engine grounds and thuroughly flushed the cooling system with green coolant. We also checked for exhaust...	View
	1998 Chevrolet Pickup 5.7L ??not certain This truck origionally came into the shop because the rear brakes were locking up. It would only happen first thing in the morning and after hitting the brake pedal and going forward and reverse the brakes would free up and work fine. I found a wheel cylinder ...	View
	1999 Chevrolet Express 5.7L tansmision We had did some other repairs a weak ago rear ac lines and one of the techs noticed the trans shifting very early and told customer he said it was normal for the van. Well it gets towed in like the brakes are locked up low 1 and reverse and low 2 are fine but ...	View
	2000 Chevrolet Blazer 4.3L immobilizer Good morning or afternoon, Wherever you are in the world - thanks for your help in advance. I require help in regard to a problem we have with a 2000 (prod date 10/99) Chevy Blazer to which we have no service information. Originally the vehicle came with 2 rem...	View
	2003 Chevrolet S10 Pickup 4.3L Poor Idle Quality, Hesitation, Misfire Install new gasket on intake and can not get distirbutor timing set it has a poor idle... and no power lined up timing marks correctly...the books and manuals say no timing adjustments... their is no codes no vaccum leaks me just stumped... any chevy fans than...	View
	1998 GMC Pickup 7.4L brakes Well, here is a real challenge for you guys - seems like the classic dirty / rusty / scaly wheel sensor mount, right? well, read on - because that didnt fix it either. This is a plow vehicle, which is well cared for and not abused. All regular maintenance pe...	View
	2003 GMC Sierra 6.6L transfer case The truck came with a low transfer and noise, no sign of a leak. Thought it must be leaking into tranny through front seal. Pulled t-case, rebuilt to fix slight damage from low on fluid, replaced the seals. Now it came in for the first oil change after that re...	View
	1995 Oldsmobile Cutlass Ciera 3.1L Poor Idle Quality, Stall, MIL Lamp on This Olds runs great, but it cuts out and dies in gear at idle. Code p0341 for cam shaft sensor. Lab scope shows erratic pattern coming out of sensor. Replaced sensor with no change. I doubt we have an ecm issue because it is probably seeing the same thing my ... Trouble codes: P0341 (Cam position sensor).	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1989 Buick Reatta 3.8L No Start Hi all Finally got time to spend on this vehicle. It turned out that the negative battery cable was the cause. There was no corrosion on the cable but the end that is attached to the battery was a cable with 3 large wires moulded into the end. cut away the...	16
	1983 Cadillac Eldorado 4.1L Poor Idle Quality, Surge, Misfire Well, first off, thank you to everyone that supplied any information. Everything posted was looked at and verified before moving on. I had a lot of replies suggesting that I check cam lift. I followed up by checking that I did infact have even cam lift on all ...	33
	1994 Cadillac Seville 4.6L MIL Lamp on Ok this tugboat is fixed. Replaced PCM & all is well. Thanks for all the help. It was a real pain doing the idle & TPS relearn, but car runs great & no check engine light. Thanks, Bill Trouble codes: P025 (24x Reference Signal Low), P041 (No Cam Signal From ICM).	14
	1998 Chevrolet Tahoe 5.7L On Star Thanks to all who replied ( except for wade who made me stupider for reading his B.S. ) I have concluded that a 1998 chevy tahoe onstar system is absolutely non-upgradeable at this time. I do feel that I have a case against the GM dealer that sold me the sys...	12
	1998 Chevrolet Pickup 5.7L No Start Thanks for all the quick replies. THis is still the best source of info for techs. I did as most of yall said and rechecked the fuel pump and sure enough when the truck would not start it was only putting out 40psi. I installed a new pump and subharness. I...	22
	1998 Chevrolet Malibu 3.1L No Start, Poor Idle Quality thanks every one for all your help and ideas checked out all avenues sensors scan data etc all checked out ok narrowed it down to pcm problem car has no flareup on start up told coutomer he had to replace pcm didnot hear back from him yet-he is a licenced tech...	13
	1998 Chevrolet Blazer 4.3L Air Mix Actuator Rick, thanks for your response. Your last sentence put me on track. Step 8 in Alldatas diagnostic routine for code B0416 states: "Reconnect the air mix electric actuator to a known good air mix actuator." ..."Observe the electric actuator while changing the te...	1
	2000 Chevrolet Impala 3.4L theft thanks to the fast replies install new tlmber and swtich did not have time to try the resisters but i will next time thank you Trouble codes: p1626 (theft).	4
	2002 Chevrolet Malibu 3.1L ignition switch You guys rock! Thanks to all who responded; you were all right on the money. I tried the procedure today when I got home from work. This is what worked: I tried to start, then released key. "Theft Sysem" light was blinking; I walked away, until the light was o...	16
	2003 Chevrolet Silverado 6.6L No Start, Cuts out, dies Sorry for the late close, but we move at the speed of Government around here. We got some good replies, such as checking rail pressure with scantool, replacing aftermarket filter element with dealer item, pressurizing fuel tank to look for leaks, and possibl...	7
	2005 Chevrolet Silverado 4.3L pass side presure system performance thank to every one who replied. this was a snake it bit me hard. i replaced the pps module for the second time then it would flash the led's but no codes so after retesting power & grounds and rechecking all the wires every thing keeped coming back to pps mod...	3
	1999 GMC Yukon 5.7L wipers\power windows\radio only Thanks for ALL the help & replies.A new BCM fixed the problem.Forgot about the need to reprogram the remote keyless entry transmitters-found out when cust picked up.Thanks again for all the fast & accurate answers.Ignition switch was not the problem in this p...	10
	1994 Oldsmobile Cutlass Ciera 3.1L Poor Idle Quality, MIL Lamp on Didn't get alot of replies to this one. Evidently no one else knows where this in line fuse is either. I did look in the right side kick panel but nothing there. What I ended up doing is running another wire from key side switched power to the feed (pink) wire... Trouble codes: PO321 (Ignition Control 24X Signal Circuit).	2
	1995 Oldsmobile Cutlass Supreme 3.1L brake lights thank you all very much i did replace the turn signal multi function switch and problem gone all brake lights work	8

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