GM Automotive Technicians Technical Discussion and Fixes for Jan 11, 2005 - iATN (Members Only)

×

Join Now

Prev	Professional Automotive Repair Technical Discussions for January 11, 2005 International Automotive Technicians' Network (iATN) - Members Only	Next
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM

	Help Request	Answers
	1995 Buick Skylark Custom 2.3L Misfire VIN: 1G4NV55DXS I never work on these so maybe you can help with what seems really weird. Engine runs on what seems to be two cylinders. Removed the coil pack and ran four plug wires from the coils to the plugs (also a ground wire from the cover to ground) to see if I could ...	View
	1997 Cadillac Eldorado 4.6L head gasket VIN: 1G6EL12Y2V threads are pulled in cylinder block,tried heli coil.Heli coil did not work.	View
	2000 Cadillac Seville SLS 4.6L MIL Lamp on VIN: 1G6KS54Y2Y This car came in with no speedometer.Replaced computer and repaired wiring.Now S.E.S. light is on because crankshaft position not learned.It will not learn with either computer and on Data PID it shows 12 volt fault// 5 volt ref. A fault// 5 volt ref. B fault.... Trouble codes: P1369 (crankshaft variation not learned)	View
	1972 Chevrolet corvette 5.7L wiper system looking for a wiring diagram for this veichle for the wiper system wiring has been cut wipers will work as long as u have the wiper washer button pushed in and you can control the speed of the wiper motor as long as you keep the washer button pushed in we are ...	View
	1989 Chevrolet C1500 Cheyenne 4.3L clutch pedal VIN: 1GTDC14Z1K Due to all of the posts that were in the iatn archives for this particular problem, we went ahead and shotgunned this one with all new gm parts and are still having the same problem. You can drive this truck and as long as you pump the clutch pedal, the pedal ...	View
	1991 Chevrolet Lumina APV 3.1L Excessive Emissions VIN: 1GNCU06D3M during test drive it was also found that on hard acceleration that engine would hold back until throttle was let up on then engine would start running good again. we could duplicate problem in shop and ignition timing would retard to appoximately 60 deg below ...	View
	1994 Chevrolet K2500 Cheyenne 6.5L electronic shift solenoids VIN: 1GCGK29F4R Hello fellow techs. I have a 94 k2500 6.5 dieselwith the 4l80e trans . the 6.5 engine is blown up and we are putting in a carberated 454 gas engine does any know if there is a kit to use the transmission ( 4l80e) with this engine or do we need to replace trans...	View
	1999 Chevrolet Tahoe LS 5.7L engine VIN: 1GNEK13R4X Hello techs, This is my brother-in-laws Tahoe. Had a no start two months ago with security light on and P1626 stored. Diagnosed and replaced bad ignition switch. Last month, he said no start and security light on again. Walked him through the relearn procedur...	View
	2000 Chevrolet Malibu 3.1L power lock.& mirrors VIN: 1G1ND52J0Y Iam trying to find the decklid relay on this car the problem is that I do not have the wiring diagram for this model and I am unnable to find it. retieves codes from the body control module and have B3267 decklid relay short to ground Does any body Knows where...	View
	2001 Chevrolet Silverado 1500 5.3L oil pressure VIN: 2GCEK19T91 This engine has a sort of backwards oil pressure problem. When it is cold, it has no oil pressure at idle. If it is revved up a little the pressure comes up ok. After the oil is well warmed up, it is able to maintain pressure, even at idle. The customer tried ...	View
	1994 Oldsmobile 98 Regency 3.8L MIL Lamp on VIN: 1G3CX52L2R hello techs, this car keeps burning out throttle position sensors, three in the last 2 weeks. it has 4.9-5.02 reference voltage, and the ground at the plug is good. we are using napa echlin sensors. they work for a few days and then they burn out--wont transmi...	View
	1991 Pontiac Grand Prix SE 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1G2WJ14T0M any pontiac geniuses out there ? this vehicle was towed in with a no start condition. we suspection an injector problem and vehicle was flodded. we did get it starter by holding the gas pedal to the floor. we installed new spark plugs and drove the vehicle.it ...	View
	1996 Pontiac Grand Am SE 2.4L 5volt circuit VIN: 1G2NF52T4T Please help! This car is driving me crazy! The 5volt feed to the MAP, TPS, EGR, Fuel pressure sensor & a/c transducer is dropping to 1 volt or less. I checked the power & ground feeds to the PCM( voltage drop test included ). I also checked the gray wire for a... Trouble codes: P0107, P0122, P0335	View
	2001 Pontiac Grand Am SE 2.4L starter VIN: 1G2NF52T81 owner stated car will not start/crank. customer drove vehicle in stating intermittant no crank. they will try to start the vehicle several times and sometimes give up and come back hours later. sometimes it will start on the first try and not act up for days. ...	View
	2001 Pontiac Grand Am SE 2.4L Misfire, CYL 2 ONLY VIN: 1G2NE12T51 HELLO QUAD FOUR FOLKS! We are tired of pulling out our hair on this! we have a intermittant miss on cyl 2 only. we have swapped out everything that we could think of that might be related. the bridge, coils, module, plugs, and swapped two injectors, and still ... Trouble codes: P0302 (cyl 2 misfire)	View
	1998 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5274W This DOHC Saturn came in with the MIL on and a code P0133 stored. The scan tool shows a 0(zero) voltage reading at the upstrean O2 sensor all the time, no matter if fuel is added. It does not move from zero. We hooked up the DVOM and lab scope at the sensor an... Trouble codes: P0133 (o2 signal slow bank 1 sensor 1)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Buick Roadmaster Collector's Edition 5.7L heater VIN: 1G4BN52P8T finally got it fixed thanks to all who helped problem was a combination of things after flushing heater core had better heat but had a large air pocket trapped after changing thermostat for 3rd time got all air out switched to different t-stat that had bleed h...	19
	1998 Buick Park Avenue 3.8L vibration VIN: 1G4CU5211X was unable to fix. the customer took as it was. I think that thje bracket that I moved may have caused the vibration. thanks for all the help	12
	1998 Buick LeSabre Custom 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G4HP52K2W Thank you to everyone who replied. The replies were mostly split between an ignition problem being wires and plugs or a injector problem. One said put computer in refrigerator. A couple mentioned the intake being a problem. Code P0303 returned again and I de... Trouble codes: P0303 (misfire cyl 3).	14
	1992 Chevrolet G30 Sportvan 5.7L Poor Idle Quality VIN: 2GAG639K2N We found 3.7 volts at the ALDL connector serial line at one time and decided to trace the wire back to the computer. At the computer we had the 5 volts that are specified. I then traced the wire and found that about 10 inches away from the ECM. The line to the...	6
	1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on, Low vacuum VIN: 1G1JC1244V Greetings, I received 6 help replies on this post and all six nailed the problem. The timing chain tensioner had broken and allowed the chain to slip two teeth out of time. It did not bend any valves. The customer had not been doing the regularly scheduled oil...	7
	1997 Chevrolet S10 2.2L cranks, no start VIN: 1GTCS1944V thanks for all the suggestions guys! i was lucky enough to find it shortly after post. you know how distinct crossed plug wires sound when cranking, (popping almost starting). well thats what this one sounded like which kept eating me. the only thing controlin...	7
	2000 Chevrolet Express 2500 5.7L Poor Idle Quality VIN: 1GCGG25R6Y Thanks for all of the suggestions. We checked motor and trans mounts OK. We can not duplicate the problem at will. We replaced the IAC again and also replaced the connector this time. There was some question on one of the connector terminals. Maybe there was a... Trouble codes: P0507 (Idle Control System High RPM), P1509 (IAC High RPM).	5
	2000 Chevrolet Malibu LS 3.1L radio VIN: 1G1NE52J2Y Thanks to all that responded to my plea David ,Kevin ,Doug , and Lester [...] all hit it on the Head ! Thanks again to all the responded and willing to take the time and effort to get me the Code ! . My son and grandson are now singing with the Sesame Street Gan...	19
	2001 Chevrolet Silverado 3500 LS 8.1L Fuel Gauge VIN: 3GBKC34G41 Hi and thanks to all who replied. after tearing my hair out on this, it turned out to be the rear tank sending unit. It was very rusted so I was afraid to take it out of the tank to test it,I ordered one, plugged it in and disconnected the battery for 15 mins ...	7
	2002 Chevrolet Silverado 1500 4.3L distributor cap and rotor VIN: 1GCEC19W02 Thank you everyone!!! I removed the vent, insulated the screen and turned off the compressor for the winter. I guess everone has seen this problem but me, I look foward to helping you all ouy in the future, Best Regards, Robert	37
	1994 GMC K1500 Suburban SLE 5.7L Instrument cluster guages VIN: 1GKFK16K6R Thanks to all who replied to my plee for help..I ended up finding the most obvious of grounds being the culpret..Right beside the battery. I found a broken motor ground aswell, but it was not the problem. Thanks again guys	9
	2000 GMC Safari SL 4.3L Rear Diff? VIN: 1GKEL19W9Y We ran out of the customers money to further effect a final repair. It was time to stop. After receiving several replies about bad diff side bearings, we again pulled cover and looked, and pried to and fro at carrier and all was tight. The noise wasn't a tradi...	14
	1997 Pontiac Firebird Formula 5.7L MIL Lamp on VIN: 2G2FV32P2V sorry it took so [...] to reply to this repair as suspected it had a bad pcm no voltage to vac switch replaced pcm reflashed pcm sent the customer on his way thank's to all who replyed . tip:when these come in for evap first check for charcoal inside switches a... Trouble codes: P0441.	3
	2000 Saturn SC1 1.9L Excessive Emissions, Poor Idle Quality, Surge, Misfire, Poor Fuel Economy, MIL Lamp on, stuck in open loop VIN: 1G8ZN1288Y Sorry for the slight delay in closing, I had to get vehicle back to shop. Charles [...] hit the nail on the head. The coolant temperature sensor was not reaching 175 deg F so ECM would not allow closed loop. The ECT sensor was faulty. Replaced sensor and all... Trouble codes: P1599 (Stall Condition).	7

(Also Available: All, Asian, Chrysler, European, Ford, GM.)