iATN Member GM Auto Repair Tech Exchange for July 25, 2008

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Open Help Requests for GM

	Help Request	Answers
	1992 Cadillac DeVille 4.9L cylinder liner hello great minds of iatn I am about to reinstall the cylinder liners of this 4.9 I cannot find any information on what to lube the o rings that seal the bottom of the cylinder. These orings seperate coolant from engine oil the machine shop I called said to us...	View
	1993 Cadillac DeVille 4.9L Poor Idle Quality, Hesitation, Cuts out, Misfire, Poor Fuel Economy First and foremost, thank you all for your input in advance! This Caddy runs like a dog. It backfires, spits, sputters, no power, and acts like it's running extremely lean. The reason I say this is because the exhaust gets very hot! Most everything seems to be...	View
	1989 Chevrolet S10 Blazer 4.3L Hesitation, Cuts out, BACKFIRE This vehicle has a hesitation/cut out at tip in till about 1/4 throttle, after that no problem accels fine. very noticeable when you put our foot hard into the throttle. Hesitates and or almost cuts out and then will backfire about 50% of the time. If you ease...	View
	1997 Chevrolet Lumina 3.1L Surge This car will read anywhere from 55 degrees on the coolant temp sensor at the cumputer to 162 degrees. I have plugged the old sensor into the pigtail and it will increase with a heatgun from 90 degrees to 162 as soon as the 162 is reached it will go back to 55...	View
	2001 Chevrolet Tahoe 5.3L Misfire Thanks to all in advance. Customer came in with a rough run only at idle. Checked data and all looked good except the misfire counters counted on all cylinders. Did some scoping and all looked good. Well, carbon or dirty injectors? Did injector/induction clean...	View
	2001 Chevrolet Monte Carlo 3.4L battery After third battery a draw was varrified. We have a 327ma draw and this draw has been observed for an hour and a half. Test results are inconsistant. I have determined the draw to be comming from the raido fuse as it is the only fuse when pulled from the fuse ...	View
	2002 Chevrolet Tracker 2.5L right cv axle customer brought vehicle in 5/22/2007 for right cv axle shaft comes out and ruins bearing and housing. overhauled differential and installed new cv axle shaft. came back 1 month later with same problem. overhauled again and installed longer center shaft on rig...	View
	2002 Chevrolet Express 4.3L crank thrust bearing when cranking to start i see excessive play at the lower crank pulley aprox 1/4" or more. spec is .002-.008. there are two vans here from same owner. both exhibit this problem. one was here for maint the other for lof and belt squeak. the belt squeak is most l...	View
	2008 Chevrolet Impala LS 3.5L Fog lights I just got this base model ’08 Impala LS (without fog lights) from the auction and it has a light hit to the front. It needs a new bumper cover and I found a supplier with new take-off bumper covers in the same color for applications with or without fog lights...	View
	2001 Hummer H1 6.5L brake calipers No information on Mitchell on Demand for this vehicle. After driving this beast the brakes will stop releasing and will over heat. We haved flushed the brake fluid. After each test drive we can bleed the calipers once and the brakes work fine until the vehicle...	View
	1999 Oldsmobile Intrigue 3.5L Excessive Emissions, Poor Idle Quality, Hesitation, Stall ok guys thanks for the help in advanced. iev got a 99 olds with a 3.5. It acts as if floods on start up. You have to put the pedal in the clear flood postion to get it to start. the customer also was complaing of stalling on decell. i confirmed the dying on de...	View
	1999 Saturn SL1 1.9L horn Customer complaint was no horn. This is a 3 wire horn constant power constant ground and a switched ground. The car had all three so i put and oe horn in. workrd great out the door customer happy. Now we are 2 days later vehicle back intermittantly when starti...	View
	1999 Saturn SL 1.9L MIL Lamp on Hello. This Saturn is here because the service engine soon light is on. The problem is I cannot communicate with the PCM. I have tried two different scan tools. I checked all the fuses. All were fine. I tried unplugging a couple of sensors to see if it was pul...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1989 Buick Electra 3.8L balancer Thanks for all the help,it turned out that the balancer was not a press fit model and it came off with a little persuasion.Have a good day,Ken	44
	1991 Cadillac DeVille 4.9L Blower Hey guys, this Cadillac is fixed. Most of the replies were too generic in nature to help. They all suggested the power module in one form or other or the power and grounds to the module. It seems most of the failures of these modules involves a ground short...	6
	1986 Chevrolet S10 Blazer 2.8L Stall after waiting days for cust bro in law to show up at shop.come to find out that bro in law installed wrong senderunit in tank from different vehicle.return line to vent looks same but configuration in tank different.installed PROPER unit in tank.vehicle noew r... Trouble codes: 42 (est circuit).	37
	1993 Chevrolet S10 Pickup 2.8L Excessive Emissions Troy Brown at fueldataone.com is the GM master in these tbi units. I have installed a lot of smog legal fuel injection systems from an outfit in michigan and Troy is the one who programs the prom chips. I haven't posted this yet, but I thought there w...	10
	1994 Chevrolet Lumina 3.1L No Start, Cuts out, Stall Thank you all for your help except Steve from Arizona. Rudeness doesn.t help fix a problem car. I t turned out to be a ecu it would get hot and di. I would put a heater on the computer and it would start to stumble. Cool it off and it would start. Thank you...	27
	1995 Chevrolet Pickup 5.7L No Start The owner has decided that he will attempt to repair on his own and is not going to bring it in. Wish him luck, he's gonna need it. Thanks for all the replies and sorry we couldn't finish this one. PS, I didn't divulge to him what I (or you guys) thought was w...	10
	1995 Chevrolet Corsica 2.2L MIL Lamp on Sorry about posting the fix late. We just got the car back and finished it. The computer was letting go of the ground to the egr solenoid after some period of cruise. Replaced the computer and solved the problem so far. Thanks for all the good advice. Trouble codes: 32.	11
	1999 Chevrolet Blazer 4.3L blend door Thanks for the great info Simple things bite you everytime, my tech wanted to verify function of actuator so never install in air box, stuck in air box, re learned all good now. Some times being a guy we have to see things work, this was one of those times he ...	2
	1999 Chevrolet Silverado 4.3L Hesitation, Misfire, MIL Lamp on Well thants everyone shes fixed. The deadhead fuel pressure was 65psi I didnt know it was suposed to be 85 psi as some posted. I replaced the fuel pump again and it runs great. Thanks again. Trouble codes: p0300 (random misfire).	7
	2000 Chevrolet Impala 3.4L wipers Everyone pretty much hit it on the nose. Replaced wiper motor with delay board and all is fixed. Thanks to all you guys.	5
	2000 GMC Sierra 4.3L Misfire Well we got to the bottom of this one. A nice cocktail of issues lead to the end of this truck. As you know I changed the injector and got the truck running. After I got it running the engine ran real rough and had Alot of engine noise. After getting comfir... Trouble codes: po300 (ramdom cylinder misfire).	8
	2007 GMC Yukon XL 5.3L tpms Hey everyone, thanks so much for your help. I have had this straightened out for a long time now but honestly forgot to get back on here and post my findings. Oops. Anyway Dave and Alex were correct about a 148 psi reading being unlearned. Where I messed u...	4
	1975 Oldsmobile Cutlass 7.5L brake pedal We received many replies to this one. Almost all agreed that the brake booster was bad or low vacuum to it. The engine is stock and not a hot rod and we had 19.5 inches to the booster. We replaced the brake booster and the pedal felt like power brakes again (n...	16
	1995 Oldsmobile Cutlass Supreme 3.1L Poor Idle Quality, Stall Well thanks for all the help, we never did get this to act up, so we just started testing, and we found the pwr and grd harness to the ignition mod. had a burnt spot from where it was not in its retainer, found GM had a update harness replaced harness and so f...	19
	2002 Oldsmobile Alero 2.2L No Start Ok. So I think I the car is fixed. I replaced the ignition switch like most of you said and so far haven't seen the car back, yet. I did notice a difference in the Security light. When it did start when I was diagnosing it the security light remained on but no... Trouble codes: B2960, B2965.	11
	1994 Pontiac Grand Prix 3.1L temp gauge Hi gang, Had 6 replies for my problem. Some suggesred drilling a hole into water jacket or head & relocating temp gauge sender. I opted to use Laneard & Alex's suggestion to replace 2 wire CTS with 3 wire sensor which uses third wire for temp gauge. Alex even ...	6
	1997 Pontiac Bonneville 3.8L power windows interior lamps THANKS TOO ALL FOR THE HELP IN FINDING THE PROBLEM. IT WAS AS MOST SAID THE GROUNDING BAR UNDER THE LEFT HAND CARPET, CORROADED AND WIRE BROKEN AWAY. REPAIRED WIRE AND CLEANED BAR AND EVERYTHING WORKS OK. AGAIN THANKS TOO ALL FOR THE HELP AND NOW I AM GOING TO...	9

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