iATN Member GM Auto Repair Tech Exchange for January 5, 2007

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Open Help Requests for GM

	Help Request	Answers
	1987 Cadillac Brougham 5.0L vents happy new year to everbody. we have this 87 caddy that came to us to check why the climate control only blows out through the floor. just recently another shop replaced the engine. upon checking the system we noticed no vacuum hose to the vacuum reserve canist...	View
	1997 Cadillac Seville 4.6L Stall To all; thanks in advance, I have this caddy, my customer bought it used a couple of months ago. We dis a tune up, oil change etc.. whenhe bought it. recently he is complaining of an idle stall that seems to happen after it has benn raining, but I only saw it ... Trouble codes: P0300 (random misfire), P0138 (p0139-), P0139.	View
	1998 Cadillac DeVille 4.6L Starting hello thanks for your help. this is the first time i have used this. so sorry. i have helped people on here. i have this 98 deville drove into shop. This car had no dash cluster lights and no display. i hooked up scanner no comunication. took dash cluster apar...	View
	1954 Chevrolet 3100 235CID heads Vehicle was driven for 500 mi. after major engine rebuid. We would like to know if any members know the valve lash specs. for this engine. adjustable tappets obvious and has soild lifters. Do these need to be set hot or cold and what the firing order is?	View
	1995 Chevrolet Camaro 5.7L No Start Thanks in advance for taking time for my post!Car came from used car dealer, which purchased car not running and could not communicate with pcm. .I hooked up tech2 and communicated with pcm, had no codes and went to data and looked for rpm and low resolution s...	View
	1997 Chevrolet Camaro 3.8L Fuel Guage Vehicle came in no start, fuel tank full. No fuel pump operation. Removed fuel, removed fuel tank, replaced module with OE AC Delco, reassembled system, vehicle runs well. Customer complains now of moving fuel guage needle upon braking and acceleration, verifi...	View
	1998 Chevrolet C1500 Suburban 5.7L MIL Lamp on Came in with P0452 and P0453. Tank pressure sensor low & high inputs emissions failure. No driveability issue. Checked sensor at harness next to tank. I have ground and 5v ref. but 0v from signal wire. This explains P0452. What has me puzzled is if I clear the... Trouble codes: P0452 (EVAP pressure sensor low input), P0453 (EVAP pressure sensor high input).	View
	2000 Chevrolet Astro 4.3L Misfire, MIL Lamp on I have been working on this car for 2 weeks, someone please help!!! This vehicle has a misfire. I can hear fire jumping inside the dist cap. Replaced all parts listed in repair history and there is no difference. Checked position of distributor and it is corre... Trouble codes: P0300 (Random Misfire).	View
	2001 Chevrolet Impala 3.4L temp guage happy new year to all.need a little education on this please.i had this 01 impala with the cooling fans on all the time and the hi-speed fan on with eng off.temp guage reading below.it's lowest limit approx 130 when i first started looking at it.the hi speed f...	View
	2003 Chevrolet Silverado 2500 HD 6.6L Cooling Systems Please Help Duramax Techs. This vehicle will burn about 1 gallon of water every 1,000 miles with no external leaks. There is a signifigant amount of smoke out of the tailpipe and it is greyish or sort of white. The truck runs OK. We followed the GM TSB for fin...	View
	2004 Chevrolet Silverado 1500 4.8L will not run monitor I THOUGHT MAYBE I HAD A BAD BATTERY CONNECTION SO I CLEANED BOTH BATTERY TERMINAL CONNECTIONS. I ALSO CHECKED ALL FUSES IN THE OUTSIDE AND INSIDE FUSE BLOCK ALL ARE GOOD.I LET CUSTOMER TAKE TRUCK AND DRIVE IT TO RUN THE REMNAINING MONITORS THAT DIDN'T RUN DUE ...	View
	2002 Oldsmobile Intrigue 3.5L windshield wipers Hello group, hope some of you have a chance to read this before the weekend. The wipers on this car will pause at the top of the windshield while in the "pulse" mode. The local dealer suggested a new circuit board, so I changed it and no difference. It will pa...	View
	2001 Pontiac Grand Prix 3.8L power steering Kinf of a goofy one hear , client brought in this car with no ps assist at all , he changed the pump with a gm unit .Now someone had told him a little while ago that his rack needed to be changed , so we changed it (customer supplied used unit)and no change , ...	View
	2003 Pontiac Sunfire 2.2L hvac Can someone please help, I have 2 of these cars that continue to bend the mode door cable. There is a TSB about foam interference, but that is not the problem. The actual door seems be be binding but for the life of me I can't see were. Is there any help other...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Buick LeSabre 3.8L tail lamps headlights thanks to everyone that helped.i found the module behind the hvac case just to the right of the accelerator mounting bracket i could have replaced it by just taking the floor heater duct off.(i removed the dash) but the car is fixed thanks again	13
	2000 Cadillac DeVille 4.6L lifters/tappets Thanks for all the replys. The most common one that I got was carbon build up on the pistons. I talked to the customer again and he said that he bought the car from a person that drove it short distances. I told him his best bet was to take it to a Cadillac de...	16
	1990 Chevrolet S10 Blazer 4.3L Poor Idle Quality, Hesitation, Surge, Stall Thanks for the many responses. This one turned out to be a fuel pressure issue. Fuel pressure spec is 10 to 14 psi. We had fluctuating pressure between 5 and 10 psi. The solution was to replace the fuel pump. Actual pressure is now 13psi and vehicle runs good ...	41
	2002 Chevrolet Malibu 3.1L Righ front wheel abs Thank you all tech. who try to help me. The car is not fixed because of the New Year vacation. The car is not come back to me before end of January 07. I let you know later what is the final fix. For the moment the most probable solution come from Roger from A...	10
	2002 Chevrolet S10 4.3L drive shaft replaced aftermarket drive shaft whith oem drive shaft. guess the cv joints were there for a reason.	5
	2003 Chevrolet S10 4.3L Timing chain Thanks to all who helped with this problem. Many of you sent the TSB related to this problem which deals with a bad timing chain tensioner. I am posting the TSB that I got from GM Technical Support on this issue. It is the same as the TSB's I received from m...	5
	1993 GMC C1500 4.3L Hesitation, Lack of power Hello again; well, still working on this pickup; it's been awhile since it has become a fill in job when there's spare time. Anyways, after a few responses mentioning fuel pressure, an new gauge was purchased and installed, still, a steady 11 PSI while cruisin...	20
	2000 GMC Savana 3500 5.7L steering wheel Thanks for all the information. The problem was a combination of a warpped rotor and the steering gear box. Machined the rotors even though there was no peddle pulsation. I adjusted the gear box. That solved everything, the van has been great since. Thanks aga...	9
	2001 GMC Yukon XL 1500 5.3L Misfire hello group we went ahead and replaced the lower intake gaskets and while in cleaned injector tip and washed out fuel rail, short term fuel trim now around 0 as before, long term fuel trim now around 3, vehicle runs great on cold start up no more misefire. wou... Trouble codes: P0300 (random misfire).	13
	2001 GMC Sierra 1500 4.8L Poor Idle Quality, Misfire Hey guys first thanks to all for your fast replies... This truck had multiple problems Turns out the right bank O2 sensor was sticking lean causing that bank to run rich and cause misfires and lean codes on that bank... I found this buy switching the front O2s... Trouble codes: P0171 (Lean Bank 1), P0174 (Lean Bank 2), P0300 (random misfire).	22

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