iATN Member GM Auto Repair Tech Exchange for May 13, 2008

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Open Help Requests for GM

	Help Request	Answers
	1990 Buick Century 3.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on Clear codes only one that returned is 88 ECM reset. Sometimes you will lose data stream when it is acting up. I believe the ECM is at fault. My understanding is you need to re-flash this unit after you change it? It has a removable prom. Test we have checked a... Trouble codes: 88 (ECM Reset), 21 (TPS volt).	View
	1992 Cadillac DeVille 4.9L engine The customer brought this car to us complaining of hot soak no start. We verified the vehicle started and ran when cold and checked his charging system. The battery had a weak cell that would show up under load testing and got worse when vehicle got hotter. We...	View
	1993 Cadillac Eldorado 4.9L Poor Idle Quality, High cruise idle This car originaly came in unable to idle down below 2000 rpm. In fact, the car would go 60mph w/foot off the gas. Our testing showed a defective idle control motor. We replaced the control and then the car would not idle down until the car speed dropped below...	View
	1997 Chevrolet Pickup 5.0L Fuel pump customer complained that when he got gas the car would not start, alldata says there is a fuel pump test terminal but does not give the location( i think its in the dlc but could not find the wright wire) anyone who knows the location or wire of the fuel pump ...	View
	2000 Chevrolet Impala 3.4L No Start, no crank won't crank, check engine light flickers once but doesn't come on, no communication, rest of ipc lights flash and go out when ignition is put to start position, once key is turned on parking lights stay on and only go off if battery is disconnected, I suspect ...	View
	2001 Chevrolet Impala 3.8L Drivers side vent Hey chevy fans. My other shop has an Impala with dual climate a/c with manual temp controls. Its fully charged and blows great cold air at idle. But when they drive it, the drivers side blows warm. They have replaced the "Head" and blend door motor and still d...	View
	2003 Chevrolet Blazer 4.3L Misfire, MIL Lamp on HEADACHE!!. owner of vehicle is a friend of shop. came in, service engine soon light on. scanned- po300. cyl. #4 misfire. decided he wanted to tune it up himself. replaced fuel filter, cap, rotor, plugs and wires(with quality products). came back, same problem... Trouble codes: PO300 (MISFIRE 4 cyl.).	View
	2004 Chevrolet Cavalier 2.2L ignition lock cylinder thanks for any help i can get ignition lock cylinder wont turn i have looked at alldata but i dont get what i should drill out to get cylinder out do i drill out lock button or do i drill in to housing to get access to the lock button spring? thanks again for ...	View
	2005 Chevrolet Blazer 4.3L loud clunk from transfer case area ? this blazer has a loud clunk when under exceleration, can only get it to do so in 4 wheel drive,{heavy exceleration}, and only after it seems the truck warms up,?? but customer claims it does it in 2 wheel drive as well,{light exceleration} mostly when pulling...	View
	2006 Chevrolet Corvette 6.0L 3-4 shift and rev have code for pressure solenoid d stuck on, flare up on 2-3 shift, and delay in reverse. codes p0700, and p2715 cleared and did not return but still feel the flare. I would greatly appreciate any help you GM techs could lend. I am a landrover mechanic trying t...	View
	1994 Geo Tracker 1.6L performance Hello all, This little 1.6 wouldn't rev up and generally ran like it had a plugged converter but that wasn't it. I pulled the timing cover again to verify timing marks were ok which they were but then remembered this engine has a habit of crankshaft keyway pro...	View
	1996 GMC Sonoma 2.2L No Start Thanks for your help in advance. This Sonoma came to us on hook. Customer installed new fuel pump thinking it was bad. We found no communication with PCM, no crank sensor signal and no fuel pump relay activity. We checked power & grounds to the computer, 5 ...	View
	1988 Pontiac Firebird 5.0L Stall, timing won't set When I first got this here, I figured right off that it needed a distributor and I was right. The magnet was cracked in four equal pieces. The intake manifold also had a coolant leak at a front port, so I did that first. Once I installed the distributor, I tri...	View
	1997 Pontiac Bonneville 3.8L power door lock customer came in with door locks not working and interior light's not working.was missing remote so i got used one and programed it.locks and lights worked fine half day, came back not working.customer stated this had been happening off and on for month.with s...	View
	2001 Pontiac Aztek 3.4L Cooling Systems This vehicle has a strong coolant odour when hot, but has no evidence of leakage. Customer had the t-stat and coolant replaced at 75,000km.(Dex-cool was used) Customer says there is no puddling in garage, but does experience higher than normal engine temperatu...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Buick Regal 3.8L steering box Well this one is fixed 2 ways: We changed the rack & it fixed the power steering problem, but the noise was still there. But, thanks to Ward - We pulled the starter only to find out that the bendix was so sloppy that it moved over & struck the flywheel on righ...	4
	1992 Chevrolet Lumina 3.4L pressure plate an o.e. clutch kit fixed the problem, do not use aftermarket parts for this job, they will not hold up. there is quite a difference in the o.e. release bearing and pressure plate from the aftermarket	4
	1996 Chevrolet Caprice 5.7L Poor Idle Quality, Surge Hello everyone. Sorry for the late post, I had to take a few days off from this car. I received some good replies to my problem. I couldn't reply personally to the emails because this is my managers account. Anyway the car is fixed. The pcm was bad and it had ...	8
	1998 Chevrolet Pickup 5.0L brake pedal wellits kinda fixed. still has lowpedal, but vehiclewillstop. when I machined the rotors they chatteredand left a crappy surface.re machined and changed pads,calipers and hoses. pedalisstill spongy but truck does stop ok. Myfreind took it to our local chevrole...	19
	2006 Chevrolet Express 4.3L Stall Thanks for the replies -- Seems that the connector to the pick-up in the distributor body was loose. Found by accident while working on it --when bumpped it would stall -	3
	2002 Oldsmobile Alero 3.4L power steering pump We replaced res cap with OEM new, res built up much less pressure, but would still leak out, but way slower. Replaced p/s pump again with delco and vehicle has not been since!!! would suggest replace cap with all p/s pump replacements. Thanks again to all who...	4
	1997 Pontiac Sunfire 2.2L overheats Hello everyone, I would like to thank everyone who responded. Problem ended up being a defective t-stat. We had replaced it when we did the head gasket. We put in a different, new stat and drove it for about 50 miles, stop and go, never overheated! I put the d...	24

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