GM Automotive Technicians Technical Discussion and Fixes for Apr 21, 2005

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Open Help Requests for GM

	Help Request	Answers
	1990 Buick Reatta 3.8L Instrument Panel VIN: 1G4EC13C9L ICP Inoperative ECCP OK but will not do self diag. Have checked data line circuit 800 and checks out according to Mitchell and also have Idenifix's help on checking out the entire BCM,ECM ECCM network. Have replaced BCM, ECM. Customer brought in reman. ICP And...	View
	1992 Buick Century Special 3.3L alternator VIN: 3G4AG54N1N gm everyone customer cam in yesterday for battery light fashing once a while and mil light on too once a while. check cahrging and startin system out . found once a while when reveing engine up the battery light came on and saw my meter read 16 - 19 volts up a...	View
	1994 Buick Park Avenue Ultra 3.8L Poor Idle Quality, Hesitation, Misfire VIN: 1G4CU5213R customers' car at idle or acceleration will have a light miss, 1 week ago, we changed the spark plugs, fuel filter and performed a fuel system cleaning, the recommendations were made based on the fact that when the vehicle was scoped, 2 to 3 cylinders were fou...	View
	1995 Buick Park Avenue Ultra 3.8L idle-noise-vibration VIN: 1G4CU5219S Hello fellow Technicans, this car runs well and sounds normal, no vibration at idle, until I replaced the factory (?) plastic idler pulleys (4 worn) with new steel (3) pulleys and (1) plastic ribbed idler, now have a rattle noise and vibration at idle only, th...	View
	1969 Cadillac CoupeDeVille 472CID Fuel Gauge Hi Friends at IATN! I have this Cadillac here that the fuel gauge always reads full. I could use a wire Diagram,If someone can fax me one,or send an attachment. I disconnected wire at fuel tank and still reads full. I then disconnected the the harness conne...	View
	1993 Cadillac Eldorado Sport 4.6L Poor Idle Quality VIN: 1G6EL12YXP I need a copy of the TPS/idle relearn procedure for this car. Trouble codes: P080	View
	1993 Cadillac Eldorado Sport 4.6L Mechanical VIN: 1G6EL12Y5P heard from the dealer that the engine was vehicle specific. This doesnt make a lot a sense to me. I see no reason why I cant put a good used motor in her. any clues for me and is there anything I need to look out for?	View
	1996 Cadillac DeVille 4.6L oil pressure oil pressure light came on, oil level good, no noise from engine sounded good. sensor had some seepage so changed sensor and change oil and filter. no delay in preforming repairs after service engine started knocking lower end. oil pressure test show less then...	View
	1956 Chevrolet C6500 235CID Rear Cylinders VIN: 6B56J01596 This is a truck with the rear wheel cylinders mounted both front and rear so they sit up & down and the bleeder screw is in the middle. The problem is that air gets trapped in the upper part of the cylinders and we cannot get the air out. The cylinders need to...	View
	1983 Chevrolet Chevette 1.6L MIL Lamp on VIN: 1G1AB68C7D Hi, This Chevette has what is called a "Tach Filter" located near the ignition coil. It looks like an old condensor but instead of 1 wire going into 1 end, it has 2 wires, 1 going into each end. I need to replace it but I cannot find a new one. Is their an aft...	View
	1995 Chevrolet S10 2.2L No Start VIN: 1GCC51440S Ill make this short and sweet. Cust bought a used motor for his truck and wanted us to install. We pulled old motor and were going to install used unit and noticed that we had to remove the digital egr and swap with old vac type on engine,no big deal. then we ...	View
	1995 Chevrolet P30 5.7L backfire VIN: 1GBKP32K1S history: vehicle in question was repaired about 1.5 years ago. complete engine assembly. gm good wrench 383 truck engine. came back 3 mths burned up???. install new engine same as before. at that time when setting time had some backfire noise, had to retard ti...	View
	1999 Chevrolet Express 3500 5.7L Converter Clutch VIN: 1GBKP32R0X Good Day All; The TCC will partially apply at idle in any forward gear selection and reverse, occasionally to the point of killing the engine. During overhaul, all electrics are replaced in the trans, along with the converter. The attempts to fix this problem ...	View
	2000 Chevrolet Malibu 3.1L Electronic VIN: 1G1ND52J6Y Hello all. Customer brought this car in complaining of a surge. when i road tested it, i could not get the car to surge, but it was not shifting properly (hesitating and delayed into 4th) with the scanner i could see that the trans range switch, trans fluid pr...	View
	1990 Geo Storm 1.6L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: J81RF2367L Hello and thanks in advance for any ideas. This is my personal daily driver and it started to idle rough and misfire, buck, and cut out under light throttle about a week ago. (It would seem to clear up under more than 50% throttle, but now I think it may just ...	View
	1992 GMC C1500 Suburban 5.7L Stall VIN: 1GKEC16KXP this is strange tis vehicle stalls when at stop and only after warm when i let it sit and run you can get in car and shift from p to r or d wont stall,but go from r to d or d to r it will,when i firts got it in it had map sensor code in it but i replaced with ...	View
	1999 Pontiac Grand Prix GT 3.8L entire electrical systems VIN: 1G2WP12K9X hi everyone,due to the fact i work on ford vehicles mostly,(dealership)and dont have much knowledge of gm cars, i need some assistance.my sisters grandprix will shut off when going over a large bump or rough railroad tracks every thing goes dead. dash lights,p...	View
	2001 Pontiac Montana 3.4L compressor clutch no power VIN: 1GMDX03E11 This vehicle when a/c switch is pressed commands the a/c on on scan tool. I have a negative pressure on the hi side pressure switch. I replaced the hi side pressure switch with dealer switch and nothing changed. I checked the shrader valve and it appears to be...	View
	2001 Pontiac Sunfire SE 2.2L 1-2sol VIN: 1G2JB52401 This car came in mil, trac lights on and no shift. codes are po753,po758 and p1860. clear the codes. In a few sec. The mil trac off and the headlight come on.thanks for any help on this one.	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52K8X First Up, THANKS EVERYONE!!! The fix was the o-ring missing on the PCV valve as I was told by 37 Fantastic Techs...I guess that We (As this was not one I was working on but had tried to help figure out.) are the only ones in the USA that didn't know what w... Trouble codes: P0401.	41
	1989 Chevrolet Camaro RS 5.0L bose radio Hello techs, Finally got this one out our hair (whats Left). Have a buddy that works at Best Buy radio, said he has had to rig these before. Had to remove lower bose kick panels and take apart housings. Inside these have a built in bose amp-cut 2 speaker wires...	5
	1996 Chevrolet C3500 6.5L clutch VIN: 1GBKC34F2S i want to thank every that send there help for this problem the reason the cluth wasent working was because the the cluth plate was to thick. so order a new cluth kit and shimme the flywheel. this took care of the prblem. thank you every body	10
	1997 Chevrolet Venture 3.4L front suspension VIN: 1GNDX06EXV thanks to some of your emails we found that the car had a bad wheel bearong/hub assembly , relacing this part took careof the problem thanks gang dennis	14
	1999 Chevrolet Tahoe 5.7L evaporator Thanks for the replies, Customer never came back, going on vacation for 2 weeks so I will not see the vehicle for at least a month. I will update when I fix it. Thanks again, Bill	6
	2004 Chevrolet Silverado 2500 6.0L Poor Fuel Economy Thank you to all that responded. I think the customer was wrong with 17mpg. From all the responses, it looks like the very best he's gonna get is 14mpg. I will sugest a cat back system and see if this helps him any. Again thank you all!	14
	2000 Pontiac Grand Am SE 2.4L service vehicle soon VIN: 1G2NF52TXY Well the fix as most of you said was a bad DRL bulb, nothing on alldata said anything about it. Had no owners manual either. Even got a call fron Norfolk, VA thank you all Ron [...]	14

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