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Prev Professional Automotive Repair Technical Discussions for January 5, 2009
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Open Help Requests for GM
Help Request Answers
1991 Cadillac Fleetwood 4.9L Misfire VIN: 1G6CCB53B4
Hi Guys I am working on a 1991 Cadillac deville tha came in originally for a rough operation (missfire) when warm at about 45 mph. At that time we located a weak injector and replaced it. It ran good when it left the shop, this was about 6 months ago. Just bef...
1996 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD52Y0T
96 Deville 4.6 codes P0171/P0174 air flow runs approximately 4 GPS at 650 RPMs long term fuel trim goes to 37% and locks there. Have blocked all vacuum passages, eleminated EGR, verified cam timing,tested compression,tested and substituted fuel,cleaned injecto... Trouble codes: P0171, P0174
1991 Chevrolet S10 4.3L Vibration VIN: 1GCCS14Z8M
HELP! Can't figure this on out! Vehicle presented with a tranny leak from the bell housing area. Customer declined repair but we also found a water pump leak and a broken transmission mount. These items were replaced, and the truck was returned to the custome...
1995 Chevrolet Cavalier Z24 2.3L Mechanical VIN: 3G1JF12D1S
Originally the engine had to be rebuilt because of a faulty oil pump. This is strange, this engine will peck or knock at idle and if you rev it up but,at exactly 1500 rpm it will stop making the noise anything above or below 1500 rpm it will knock. Also if you...
2000 Chevrolet Blazer LS 4.3L Surge, Misfire, MIL Lamp on VIN: 1GNDT13W2Y
Thanks For Any Help This truck will missfire only on light acceleration up to about 35 miles per hour.After 35 its gone.If you take off hard theres no miss.It will not miss under load in shop.Apears to only miss while moving.All scan data looks ok.STFT is 130... Trouble codes: P0300
2002 Chevrolet Express 3500 LS 5.7L Stall, Misfire, MIL Lamp on VIN: 1GAHG39R12
hi friends,this van came in with a misfiring and a hard start problem.I found that the fuel pump was only puting out 40 it was replace and that took care of the hard start.after installing a new distributor I start having a p01345 code.found ot that the... Trouble codes: P0351, P0300
2002 Chevrolet Express 2500 5.7L vibration VIN: 1GTGG25RX2
body shop replaced above items from deer hit.customer complained of vibration after repairs.when you drive like a idiot the van gets a bad vibration in floor, goes away when trans. shifts but comes back at high rpm's until trans shifts again or you let off the...
2004 Chevrolet Avalanche 1500 5.3L driver's window VIN: 3GNEC12T64
This vehicle came in with both windows going up slowly and having to cool off to raise window completely. Replaced both motors (aftermarket) about two months ago, now the driver's window is in the same condition, and the passenger, though better than the drive...
1997 GMC Jimmy SL 4.3L rear window VIN: 1GKDT13W9V
thanks for looking at this request.jimmy will pop rear glass when shifted into neutral,doesn't work w/switch.has power constant,ground only in n or p.due to age of vehicle cust doesn't want to spend ton of time question is ground seems to run threw ...
1999 GMC Sonoma SL 2.2L Hesitation VIN: 1GTCS1444X
truck came in for a quick stumble or hesitation on acceleration or decel. preformed computer test and no dtc's were found. list's no misfires in data or in mode 6. spark plugs and wires have been replaced. with ac delco parts. used a test module and coil's. ma...
2002 GMC Savana 3500 6.5L Excessive Emissions, Poor Idle Quality, Surge, Cuts out, Misfire VIN: 1GDJG31F72
I work on very few of these so I am not well versed on how GM controls these. I cannot get this pump to time correctly. When it came in the offset was +.09 and under timing enable procedure the DES and ACT were both 0. I adjusted the pump toward the drivers ... Trouble codes: P0238 (Boost sensor circuit)
1993 Pontiac Bonneville SE 3.8L hydralic system VIN: L0P1293859
Car came in with low pedal. Checked all the mechanical on front and rear. I had to bleed with a power bleeder to get the pedal back to normal ( or at least close to it) I have since had to do it again and it's now it need of another bleeding. I looked for leak...
1998 Pontiac Grand Am SE 2.4L Charging VIN: 1G2NE12T7W
Hello and happy new year to all,I have this car that was driven to my shop on new battery and new alternator that was replaced by the customer.I checked the fuses and the fuse was blown for the alternator so I tought well that is an easy one,after replacing th...
2008 Saturn Aura XR 3.6L Tire VIN: 1G8ZV57748
Tire pressure light turned on for a low tire. We aired tire up and cant find reset procedure forlight. Thanks in advance.

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52K4V
Sorry for the long delay, the original diagnosis of a bad crank sensor was correct, what was not correct was that the scanner lied to us and said we were getting no signal after we replaced the sensor.This led us to finding out why and in the process blew a fu...
1999 Buick Regal LS 3.8L valve noise VIN: 2G4WB52K6X
First of all, let me say that I appreciate everyones support in this matter. We will not be able to correct this vehicles problems as the owner has chosen to take us to court. Since the owner initially paid the bill by charge card then had the payment witheld ...
2006 Cadillac CTS 2.8L Filler tube VIN: 1G6DM57T66
Thanks to all the responses. The majority of them said to check the filter in the canister. There is a bulletin from GM concerning this but that wasn't the problem. We eliminated all the other issues and determined the tank had to be dropped due to a restricti...
1994 Chevrolet S10 4.3L shifter VIN: 43568973EW
still can't get it to shift into and stay in 4th gear. It grinds a bit and then goes in gear. appreciate any new ideas
1995 Chevrolet Blazer 4.3L No Start
hey guys it turned out to be the IDM now i've got pulse and the truck runs fine thanks to all the responses.
2000 Chevrolet Silverado 1500 5.3L 2-3 shift VIN: 2GCEK19T0Y
2001 Chevrolet Silverado 2500 HD 6.0L Spark plug VIN: 1GCHK209V7
We pulled the exhaust manifold and had good access to the spark plug hole. The threads were mostly gone, but no other damage. I had several recommendations for a company called Time-Sert ( to get a kit for this repair. The California distribut...
2001 Chevrolet Cavalier 2.2L No Start VIN: IG1JC52401
Happy new year to ALL. Thanks to all who replied. The replies were fantastic. Several replies said the theft light was working as should. I guess there is no way to manually test for the ecm receiving theft signal bcause that is communicated through the "buss"...
2002 Chevrolet Silverado 2500 HD 6.6L Cylinder Head Surfacing VIN: 1GCHK29162
Sorry about the long wait for closing. We were on a long waiting list for the gasket set, apparently Fel Pro & GM were both on national back order. We looked at a picture of Fel Pro's offering & thought it may not be the quality we were looking for (perforated...
2004 Chevrolet Venture LS 3.4L heater VIN: 1GNDX03E34
Had a few replies on this, a couple said to check the blend door which I had already done. Also had a couple suggestions of air pockets, I dont think it is this because it is not overheating and it is still having the heating problem after being driven several...
2004 Chevrolet Tahoe LS 5.3L traction control activating VIN: 1GNEK13TX4
hello and thanks for all your help we have opted to try replacing the front bearings and sensors however the customers schedule is such that i cant get the truck back before i must close my request thanks again iatn is a great tool for all of us happy new year...
1998 GMC Safari SL 4.3L Hesitation VIN: 1GMHM1GW1G
Well thanks to all that replied, your information was very helpful. The fix to my problem was a stripped out stator shaft on the front of the transmission. There is a bulliten related to this concern which has you inspect the stator shaft and replace it alon...
2001 Saturn L300 3.0L horn VIN: 1G8JW54R1Y
thanks for the responses--vehicle was not returned to the shop, but here is a summary of the possible fixes; 1 heat the bcm with a heat gun. 2. I dealt with a similar issue today it was on an 03 saturn ion. had no crank no start intermittent horn blaring. ...
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