iATN Member GM Auto Repair Tech Exchange for August 22, 2007

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Open Help Requests for GM

	Help Request	Answers
	1998 Cadillac Seville 4.6L theft deterent been rackin my brain on this one, and mostly cause of lack of info. this cadi has a service theft system light on and security light on dash lit all the time. all of our scanners would not read vtd mod. so after finnaly finding the sequence in iatn to read cod...	View
	1998 Chevrolet Corvette 5.7L vents I hope you GM gurus can help me with this little red Corvette.The A\C does not blow cold but pressures are normal and small line next to firewall is cold.I have no codes but the temp mode actuator data is strange and does not respond to the controls.The RH sid...	View
	1999 Chevrolet p30 7.4L compressor i have been checking this thing out for so long that i am starting to confuse myself. somebody set me straight please. My first question is: should the circuit from the ecm to the ac relay show 12 volts at anytime? Im thinking no. but i dont know for sure. It ...	View
	1999 Chevrolet Silverado 5.3L Hesitation We have a 99 silverado that has a very bad hesitation in it. The problem occurs after at least 4 hour sit. Ambient temp not related. This is a open loop issue. Closed loop it is fine. The truck idles perfectly but falls on its face and pops from intake with to...	View
	2000 Chevrolet Astro 4.3L Mechanical Hey all, Replace all above parts about 3 months ago for a compressor lock-up. Came back last week for not coolong well and noise. Found compressor making a little noise and not cooling good. Replaced compressor with a white box delphi compressor and replaced ...	View
	2000 Chevrolet S10 Pickup 2.2L Hesitation hi everybody,thanks for any help in advance. this truck starts hard,sluggish.low power. as you can see fuel pressure is low.has anyone seen this problem before with flex fuel? please help	View
	2001 Chevrolet Camaro 5.7L pings This Z is driving me nuts, I can't seem to stop this from pinging no matter what I do. Car originally came in severly pinging and found MAF sensor to be bad. Replaced MAF and condition was 95% better but still exhibits pinging under tip in adn also sometimes u...	View
	2003 Chevrolet Avalanche 5.3L Poor Idle Quality, Surge, Stall Vehicle in for stalling, hard starting and surging/poor idle, backfiring. Codes present as I have listed. Smoked intake manifold and found no leaks other than a wisp from the throttle body. Tourque checked on intake bolts and was good at 10nm. Cant fault intak... Trouble codes: P0171 (lean), P0174 (lean), P0300 (random multiple misfire).	View
	2005 Chevrolet Impala 3.8L Cuts out, Stall I am at a total loss with this one. Came in with a complaint of stalling and worse with the ac on. It happens quite a bit in the first half hour of running and then seems to go away. I had both codes P0350 & P1350 to due with ignition bypass circut & coil cont... Trouble codes: P0350 (ignition coil control circut), P1350 (ignition bypass circut).	View
	1992 Geo Storm 1.6L Hesitation I am past losing my butt on this one, and am down to the point that it is now a vendetta. HELP This vehicle came in with lots of parts having been thrown at it. When we got the car it would'nt even pull itself into the shop. After diaging it, we found that it ...	View
	2004 GMC Yukon XL 5.3L ipc reprogamming see related history, thanks.	View
	1991 Oldsmobile Cutlass Supreme 3.1L Excessive Emissions, Poor Idle Quality, Surge, Stall, Misfire First time post and thanks in advance. This vehicle came in for stalling problem. I found low fuel pressure out of fuel pump, replaced fuel pump and brought pressure up but still stalls. Found the 02 sensor showing some lazy and erratic voltages so that was re...	View
	1998 Oldsmobile Aurora 4.0L Cuts out customer towed car in for no start, said car had been sitting 7 months while deployed. bad battery, replaced spins over no start, no fuel pressure, tested and replaced fuel pump. car starts and runs great, at idle. on any acceleration car bogs badly and is wor...	View
	1995 Saturn SL1 1.9L Stall, no tach at times Hello fellow technicians!! This saturn is giving me some problems and hoping you all can help. I have a code 19 with an intermittent stall and no tach read out. I have gone over this entire circuit several times. As far as I can tell, from the diagram I have f... Trouble codes: 19 (Ignition control 6x signal fault), 83 (low coolant switch open).	View
	2002 Saturn SL1 1.9L starter Vehicle towed-in with no crank, no start condition. Blew #3 ignition (30 amp) fuse. Replace, fuse blown again. Unplug defrost HVAC fuses & relays, disconnect starter range switch to isolate. Fuse still blows. Remove and inspect maxi fuse center for corrosion a...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1998 Buick Park Avenue 3.8L convertor has a gear in the transmission that is chiped and at the transmission shop being repaired - it has internial transmission problems causing concern	12
	2001 Buick Century 3.1L fuel gauge	19
	1992 Chevrolet Pickup 4.3L No Start I want to thank each and everybody that replied. It turned out to a couple things. I traced the wiring from the fuel pump relay back to the tank and discovered a frayed power wire. Repaired the wire. I found a dirty ground at the frame near the tank, cleaned a...	9
	1996 Chevrolet Monte Carlo 3.1L Noise under load I knew if I posted a help request I would get some good information. This noise sounded somewhat familiar to me but I could not remember what it was. The replies pointed me in the right direction, the drive chain slipping,( stretched) it sounded like an old...	11
	1999 Chevrolet Suburban 5.7L Mechanical Customer has not brought back truck yet. many helpfull responses and will test when he brings it back	12
	2003 Chevrolet S10 Pickup 4.3L Starting hello sorry took so long to post fix but customer took vehicle on vacation and just returned and confirmed fix. found # 3 and 7 injector seeping ONLY when hot. thank you to all that replied you thaughts where very helpful thanks again shayne	10
	2007 Chevrolet Uplander 3.9L Unknown this vehicle left before we had any info - did not fix	6
	1994 GMC Safari 4.3L No Start Found short in wiring to injector grounding out on manifold. Wire was pinched when plenum was instaled. Thank for the replies.	5
	1995 Pontiac Grand Prix 3.1L Starting Thank you to all who offered help.The fix for this car was replacement of the theft deterant modual.The ign cyc wires and key were fine.The modual would not ground the relay in when the key was in the start position,also the security light on the dash would no...	6
	2002 Pontiac Bonneville 3.8L air bag Thanks to all that were able to help. The solution to the code B0101 was to replace the EFS sensor. Basically the Air bag computer sends a signal to the EFS sensor. If it doesn't get an answer or doesn't like the answer it gets it sets code B0101. The only rea...	4
	2002 Pontiac Grand Am 3.4L starting Thanks everyone for the input. replaced the ingition switch and had the bcm and pcm reflashed for updates and hasn't acted up again.	10

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