GM Automotive Technicians Technical Discussion and Fixes for Oct 29, 2007 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1997 Buick Regal LS 3.8L Excessive Emissions VIN: 2G4WB52K9T No vacuum leaks found. pcv and o-rings ok. o2 lazy, replaced, 02 went down and nox went up. egr position sensor actual was a little off so I replaced the egr and passages appear to be clear. This dropped nox from 710/697. When I add propane to front of maf eng...	View
	2001 Cadillac Seville STS 4.6L steering VIN: 1G6KY54951 Hello, I have This Caddy That Is driven my An older gentleman and he say the power steering goes Away Sometimes and comes right back.His Son who has Also driven The car said it has happened To him. I have checked the fluid which is full and does not appear ...	View
	1989 Chevrolet C2500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1GKDT13S02 hi iatn tech have check every thing twice it has a code 45 rich exhaust the 02 will go to 8mv and stay there st,lt fuel trims drop. when i try to rev it slow it will not go past 2500 rpm and black smoke pours out the exhaust if i put it to the floor fast there... Trouble codes: 45 (rich exhaust)	View
	1991 Chevrolet R3500 Cheyenne 7.4L left front wheel VIN: 1CRLF47R4L I did a 4 wheel brake job on this truck about 6 months ago, customer has driven it very little since then, about 400 miles. Last month he said it developed a pull to the left, that, when stopped hard enough, will cause the left front wheel to lock up. I test d...	View
	1995 Chevrolet Monte Carlo Z34 3.4L engine VIN: 2G1WX12X9S We have changed intake gaskets, PCV valve and PCV chamber and gasket. But within 1 minute the car will use 3 liters of oil..??? Customer claims no problem before belt broke. Have to believe as there is no way car could be driven this way. It may be something w...	View
	1997 Chevrolet Express 1500 5.7L noisy fuel pump VIN: 1GBFG15R5V Hello all, customer brought a 97 chevy g1500 van into our shop with a complaint of whining noise and was suspicious of fuel pump problem. With engine running on the hoist, noise was from the fuel tank/pump, could tap bottom of tank and noise would change. The...	View
	2005 Chevrolet Cobalt LS 2.2L MIL Lamp on VIN: 1G1AL12F45 Customer came in about a month ago complaining of a MIL light on and cooling fan running at high speed when KOEO or KOER. Found code P0480 (Coolant Fan 1 control circuit). Checked data stream (Modis) for high ECT reading, AC active, both were ok. Had no data s... Trouble codes: P0480 (Coolant Fan 1 control circuit)	View
	1994 GMC Sonoma SL 4.3L hydraulic VIN: 1GTCS14Z8R 1994 GMC Sonoma pickup 2WD. 4.3L engine. 4 wheel anti-lock brakes. This vehicle came in with loss of brake pedal. No loss of brake fluid. Brake linings OK. Installed a new master cylinder and brake pedal still sinks to floor after repeated bleeding of ABS EHCU...	View
	1999 GMC Yukon Denali 5.7L 2-3shift VIN: 1GKEK13R1X Hello everyone, this vehicle came in and was in limp home mode,( stuck in third gear). I pulled code PO758 shift solenoid B electrical malfunction, ( 2-3 shift). I checked for power to at the fuse and terminal E on the trans connector and both had Battery volt...	View
	2003 GMC Savana 2500 4.8L Steering/Brakes VIN: 1GTGG29V33 Here's a good one for you GM nuts and front end specialists. Customer brought in this van to us with a violent vibration/shimmey on the highway about 50mph. I drove van for about 25 miles at various speeds (45-80mph)and could not duplicate.I called customer he...	View
	2004 GMC Yukon XL 1500 SLE 5.3L engine VIN: 3GKEC16T74 Hello, I have this yukon in for an engine noise. Sounds like a light knock and almost has a light chirp. Noise may be coming from front of engine or front of left valve cover. We took the serpantine belt off and the noise stayed the same. Sounds like it could ...	View
	1964 Pontiac GTO 389CID fuel gauge Hey Everybody! This car is driving me nuts! Initially this car came in and the fuel gauge did not work, stayed past full. I replaced the sending unit, and it nows stays on about 1/4 tank. I thought possibly the wires on the back of the gauge were installed wr...	View
	2000 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NF52T3Y this vehical was towed in from another shop that didnt want to get involved in it.the vehical wont start and it cranks over like it jumped time,chain is broken or no compression.so i started there first i pulled the cover off and lined up the marks everything ...	View
	2001 Pontiac Sunfire SE 2.4L cruise VIN: 3G2JB52T51 checked all powers and grounds and all from switch and brake switchs all good.Tryed new CC mod still nothing.All connections very good condition.	View
	1998 Saturn SL1 1.9L Poor Idle Quality VIN: 1G8ZG5282W Good morning fellow techs, We have a 98 Saturn SL1, the idle on this car hangs at 1500 for up to 5 seconds or longer then drops, the customer replaced the IAC and we replaced the TPS based on a code we found. Prior to changing the TPS the idle would stay hung ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Buick Skylark Custom 3.1L instrument cluster VIN: 1G4NJ52M7T John must have chased this one before.The sdm had water damage and was shorting out the cluster.It is nice having this tool to help with the hard ones.Thanks to everyone who responded.	7
	1979 Cadillac Seville 5.7L Misfire VIN: 6S69B99472 Dear IATN techs and staff, Unfortunately I have to close this request with no fix. One thing I forgot to mention was that this car has been sitting at our shop for almost a year, and the customer does not seems to be in a hurry to fix it. I have given all the ...	19
	1998 Chevrolet P30 6.5L Poor Idle Quality, Misfire, Vibration/Shake VIN: 1GBKP32Y6W Thank you for your help, but it turned out to be the harmonic balancer was loose on the crank shaft. The balance was solid and was installed when I recieved the motor initially. The bolt was not tight, I took it out with my fingers. The nose on the crank wa...	3
	2000 Chevrolet K2500 5.7L Carrier Bearing VIN: 1GCGK23R3Y Well this one sucked, but luckily it was not our fault. Every vendor we tried gave us the wrong carrier bearing. Apparently there was a problem with cataloging. The aftermarket told us even though it looks different, it was the correct bearing. After installin...	13
	2003 Chevrolet Express 1500 4.3L i/m status VIN: 1GCFG15X53 Thanks for everybodys help. It finally switched to yes dont no what I did, the only thing that was different was the weather the few days I was trying it was in the 60's and the morning it switched to yes that night it was in the 30's. So maybe it wasn't cold ...	13
	2004 Chevrolet astra .0L Lighting VIN: 93CTMO8L34 Hello everyone, I really appreciate the help I recieved. I took the advice I recieved from francis, brom and marshall to fix the vehicle. I did use dexcool coolant which I found out was of course the recommended fluid. The reverse lights ended up being an e...	3
	1988 GMC C2500 Sierra 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1012101020 thank to every one that tryed to help but i did not win you cant win them all thank again Trouble codes: 45 (rich exhaust).	11
	1999 GMC Savana 1500 5.0L Misfire VIN: 1GKFG15M9X THE SMOKE IO DESCRIBED AS WHITE SHOULD HAVE BEEN ALSO SAID TO SMELL VERY RICH AS IT WAS EXHAUSTED ON A COLD MORNING OUT THE DOOR WITH A HOSE. ALSO SOME TECHS WERE POINTING TO HARD PART FAILURE, I HAD SAID THE PROBLEM WAS INTERMITTENT.LAST TEST WAS TO CUT WIRE ... Trouble codes: P0300 (misfire).	10
	2002 GMC Yukon XL 1500 SLE 5.3L heater VIN: 3GKEK16Z02 heater core fixed probelm of heat as heater hose temps were good in and out after core replacement, but then needed actuator for blend door at bottom of box, I told the tech to plug everything in and try it before he closed up the dash, but actuator may not ha...	3
	1997 Pontiac Bonneville SE 3.8L Automatic Climate Control VIN: 1G2HX52K7V Only got 6 replies, but only needed one. Within minutes of posting this help request, Matt [...] responded with an experience of his own and said to check the trunk for a wet connector. Well that was a little vague to me, but luckly I checked the trunk twice ...	7
	2000 Saturn SW2 1.9L Excessive Emissions, Surge, MIL Lamp on VIN: 1G8ZJ8274Z Our mistake, we mixed up the camshafts and installed them in reverse order. Trouble codes: P0172 (O2 sensor Bank 1 Sensor 1 rich).	4

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