GM Automotive Technicians Technical Discussion and Fixes for Apr 17, 2007 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2000 Buick Regal GS 3.8L instrument panel VIN: 2G4WF5516Y all warning lights come on as if you cycled the key. they do a bulb test then go out . I can never get the lights to act up on me but the customer says it is all the time.Any info would be great.	View
	1994 Cadillac DeVille Concours 4.6L Unknown VIN: 1G6KF52YIR +Code po56 sets repeatedly. Trans never shifts wrong and always engages O.D. At times while watching data stream input shaft signal will drop out. Sometimes code po39 will also appear(TCC Engagement error). But trans always shifts fine and goes into O.D. Other...	View
	1998 Cadillac Catera 3.0L Misfire VIN: WO6VR52R8W Vehicle came for misfire and headgasket job cuz it was leaking dexcool from the back of the engine cant see cuz of no room between firewall. decided to replace it when opening the cowl or should say 1/4 way on the job found a heater valve leaking . stopped rig...	View
	1985 Chevrolet K10 Scottsdale 5.7L Pwr Windows VIN: 2GCEK14H7F I have a problem with the power window wiring. The truck came in for the pwr. windows not operating. What I found is the wiring (almost each individual wire) has broken off of the clips that attach them to the power window switches. What I need is a schematic...	View
	1991 Chevrolet Corsica LT 3.1L No Start VIN: 1G1LT53TOM hello all, this car came in with a no start. found no communication with scanner. replaced ecm, car then started but ran poorly but now have communication with ecm. found restriction in catalytic converter, removed exhaust pipe for testing so that it wouldn't ...	View
	1994 Chevrolet K1500 4.3L Trans VIN: 1GCEK14Z0R Hello to all. We have a strange problem w/ this truck that we cannot seem to get a handle on. It shifts and locks up way too quick. Found a fix that said cut the blue wire to the trans but no help. All functions read normal on the engine side but on the trans ...	View
	1994 Chevrolet C1500 5.7L Poor Idle Quality, Surge VIN: 2GTEC19K9R This truck came in with a rolling idle up and down. Fuel trim readings and O2 readings indicate rich condition. Can unplug 1 of the injectors, idle stabilizes and O2 reading drop. So replaced injectors, check distributor stator for cracks, looseness, all ok. C...	View
	1995 Chevrolet S10 4.3L Harsh P-D,P-R,1-2 shift VIN: 1GTCS19Z1S Right up front...we are not a tranny shop.However,in one of my weak moments I took this truck on[customer is one of our oldest clients][30 years]and thinks we can fix everything from his mower to his PC.So I take this thing for a drive and EVERY shift is VERY ...	View
	1996 Chevrolet Tahoe LS 5.7L 2-3 shift VIN: 1GNEK13R7T thanks in advance. got this tahoe that is messing with me.about 4 weeks ago it came in in limp mode. had po758. i did diag by following all-data trouble tree and everything checked ok but solenoid. i replaced it did test drive according to procedures all was o...	View
	1996 Chevrolet C1500 Cheyenne 5.0L Cuts out, Stall VIN: 2GCEC19M7T Vehicle came to us no-start. We replaced the engine. On the test drive, it cut out(sometimes will stall) under acceleration, both from a standing start, and at highway speeds when kicking down into passing gear between 3500 and 4000 RPM. Starting out under loa...	View
	1997 Chevrolet K1500 Suburban 5.7L MIL Lamp on VIN: 3GNFK16R4V Hi, we have this suburban that has been back twice for O2 sensors. We don't work on many American cars here, so we are looking for a little help. The first 2 times the car was here it had a P0141B code for Bank1 Sensor2 heater circuit. We tested the voltage at... Trouble codes: P0135, P1414, P0155	View
	2000 Chevrolet Blazer LS 4.3L fuel gauge VIN: 1GNDT13WX1 hope someone has seen this its driving me crazy. customer say gauge always worked and one day stuck at empty. checked harness at tank all looks good with harness unplugged gauge never moves i thought id see it move. lowered car got in and gauge started reading...	View
	2000 Chevrolet Silverado 1500 4.3L Misfire VIN: 1GC2GWEBGY Hello U all well i have a great truck to work on here, it started out begin a no start. This truck belongs to a delivery driver he puts abut 8 to 10 thoundsand miles a month on this truck. When it first broke down we inspected and found a code PO 300 we had fo...	View
	2000 Chevrolet Venture 3.4L electric window VIN: 1GNDX03E2Y we have a passenger front electric window regulator that has eaten itself for the second time.usually its the drivers side that wears first and that one works fine.in wisconsin i usually blamed it on ice.replacement parts are very expensive.memory tells me win...	View
	2000 Chevrolet Silverado 2500 6.0L 4-3, 3-4 shift VIN: 1GCGK24U4Y This truck drives and shifts ok when left in drive. The problem is when manually shifted from drive to 3 and back it has a harsh shift. It is intermittant. The 4-3 shift is worse. It does it more often during the 4-3 shift but eventually does it both ways.. Se...	View
	2002 Pontiac Sunfire SE 2.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G2JB12472 Customer just purchased vehicle a few weeks ago. Brought in yesterday complaining of intermittent hesitation and cut out. Also instrument cluster lights go on and off while during idle and while driving. All this occurred mysteriously after customer installed ... Trouble codes: U1000 (no state of health from module)	View
	1999 Saturn SL2 1.9L fuel and temp gauge VIN: 1G8ZK5277X im looking for someone with input as to why this may have occurred so that it doesnt again. After the dash was pulled to repair a bulb for the odometer display the temp and fuel gauges read on the opposite sides of the range. my boss did repairs the battery wa...	View
	2004 Saturn Ion-2 2.2L valvetrain(lifters) VIN: 1G8AJ52F94 we have a 2004 saturn ion1 and it came in with valve train noise(lifters) it has a miss also @ idle caused from the noise..we have check the oil pressure and it has 80 lbs @ idle..i have seen on IATn this problem but no apparent fixes...any help would be appre...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2001 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y31 All responses said to use O.E.M. cats. I told customer the same as the responses, and he said use the aftermarket. He wasn't going to pay for o.e.m. One response suggested to have pcm reprogrammed, but I didn't check to see if possible. I don't understand how ... Trouble codes: 420 (catalyst efficiency).	27
	1994 Chevrolet K2500 Cheyenne 6.5L Cooling Systems VIN: 2C1MS2469R i will call this a fix because all of you say to pull both heads which i will do soon and replace everything needed.thanks again	29
	1995 Chevrolet S10 LS 4.3L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GCCS19Z3S Customer sold vehicle before I could complete the repair. Things that where worth while to mention though where that the Genisis scan tool has a problem interpreting the data steram on these vehicles, so be cautious. Pay close atention when rebuilding the thro... Trouble codes: P0171 (Exaust Lean), P0300 (Random Missfire).	11
	1996 Chevrolet K2500 Cheyenne 6.5L No Start, Stall VIN: 1GCGGK29FX Thank you for all the replies. I pretty much decided that the chip must be important enough for them to install it at the factory, so it would be best to have it there. I ended up removing the original driver module from the pump and of course the chip was sti...	9
	1999 Chevrolet Express 3500 5.7L Excessive Emissions, Misfire, MIL Lamp on VIN: 1GCHG35R9X The problem turned out to be the ECM. We noticed that the vehicle would run properly w/ bank 2 sensor 1 unplugged. When we unplugged this sensor in the right bank the fuel trim would go back to normal and pulse width would also come back to normal. As soon as ... Trouble codes: P0151 (o2 sensor circuit low voltage), P0174 (system too lean).	18
	1999 Chevrolet Venture 3.4L Master Cylinder VIN: 1GNDU06E3X Well Guys I really like to thank everybody that reply to me, You guys are great, I did learn that is not needed a tech2 to do this type of job I was able to replace my master cylinder & bleeded with out to much hassle, All I need to do was remove the complete ...	5
	2000 GMC Savana 1500 5.7L belt VIN: 1GDFG15RXV replaced belt with a/c delco brand belt. no more noise. not an ad for a/c delco, but sometimes it has to be o.e.	19
	2000 Saturn LS1 2.2L Hesitation VIN: 1G8JU52F7Y Ok fellow techs, after a few days running this by the customer we convinced him to go with the Module and Coil as Ivelin and Richard suggested, we replaced both items and the car runs great. So thanks to everyone who logged in and helped with the fix. IATN has...	4

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