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Prev Professional Automotive Repair Technical Discussions for January 12, 2007
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Open Help Requests for GM
Help Request Answers
1991 Cadillac Fleetwood 4.9L Brake Pedal VIN: 1G6CB53B1M
We had a customer tow this vehicle in because they said it had no brakes. We found it had a very poor pedal if applied softly and a fairly good pedal if it was hit hard. If you let up pressure after pressing the pedal hard it will sink. It felt like a text boo...
2001 Cadillac Catera 3.0L Mechanical VIN: W06VR54R21
have oil leaking from valve covers - have horror stories about working on this motor and car in general.looking to hear from someone with experience doing this job. thank's in advance for your time.
1990 Chevrolet Corvette 5.7L Misfire VIN: 1G1YY238XL
Hello all, I have a 1990 corvette that has 3 dead cylinders at all times, #5,6,7 CYLINDERS. Have scope tested igntion and even replaced all igniton components except internal distributor parts, have tested compression-good, have scope tested injector pattern...
1993 Chevrolet S10 Blazer Tahoe 4.3L Cuts out, Stall VIN: 1GNDT13W7P
This one came to me after the computer had been replaced, the fuel pump relay, the fuel injector and who knows what else has been done. It will just quit at idle for no known reason. It never loses spark during any of these episodes. Fuel pressure hovers betwe...
1994 Chevrolet C3500 6.5L No Start, Cuts out, Stall VIN: 1GBHC39F2R
Stalls at any rpm with hard restart. Occurs mostly with electrical load. Sometimes won't start and sometimes wont exceed 2000 rpms. Trouble codes: 13 (engine shutoff driver fault), 41 (brake switch fault), 99 (pedal position 2 ref fault)
1996 Chevrolet C1500 Cheyenne 5.7L convertor VIN: 1GCEC19R7T
Got what feels like a torque convertor shudder in this old pickup. All tune-up parts replaces for other concerns. Scanner shows no misfires during event. I'm going to go into this one, but need advice on what to replace other than just a normal overhaul with t...
1996 Chevrolet Cavalier 2.2L Cooling Systems VIN: 1G1JC124OT
good evening. customer brought vehicle in due to overheating.he had installed a new thermostat, but not sure of the bleeding procedure.once in the the shop we checked for coolant leaks, water pump operation, restrictions, cooling system for head gasket problem...
1997 Chevrolet Blazer 4.3L No Start, Stall VIN: IGNDT13WIV
I am about to pull my hair out on this one. She calls every couple weeks or so. Won't start. I get there starts right up. Made her leave it with me for 4 days, could not get to not start. Have checked everything I can think of. All things check out okay. The o...
2002 Chevrolet Impala 3.4L radio VIN: 2G1WF55K72
Radio works normal most of the time. Occasionally however the radio will display "locked" and not work. If you shut the key off and then restart sometimes it will come again normal and sometimes still stay locked. The custemer doesn't do anything other than re...
2002 Chevrolet C3500HD 6.5L alternator VIN: 1GDJK33122
good morning techs. just looking for some quick info on this duramax i have been working on and alldata is nodata on this charging system. when you start the truck for the first 15-20 seconds the alt will not charge then it charges like it should. tested alt. ...
2003 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J63
Vehicle towed in over night. I went out and it started right away. Checked basics, fuel and tune appear good at this time. Called customer, he tried to start if for some time. Even had it jumped to keep trying. He says it cranked fine but did not start. I have... Trouble codes: U1000 (State of module health)
1998 GMC Jimmy Envoy 4.3L flasher VIN: 1GKDT13WXW
I known I'll kick myself once the problem is found, but I'm missing something small. After the brake petal is pushed, the flasher starts to click. Sometimes contiues, sometimes stops by itself. When flashing, only way to stop is to disconnect rear brakes light...
1997 Oldsmobile Aurora 4.0L interior lights VIN: 1G3GR2C8V4
no true repairs or testing done to car code cleared and driven bad ground? bad module? a starting point? any advice or info appreciated guys`

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Limited 3.8L Unknown VIN: 1G4HR52L7R
Thanks to all who responded. I have learned to leave the trans to the trans guys. Split a seal while installeing piston. Guess we all learn the hard way sometimes. Thnaks for all the replies.
1999 Buick Park Avenue 3.8L trunk VIN: 1G4CW52K4X
sorry to say i did not get this vehicle back to work on it .They will contact me as soon as its possible, all replys are helpfull though.
1998 Cadillac Eldorado ESC 4.6L Drive-axles VIN: 1G6EL12YXW
Thanks to all who read this help request. Four people had the right answer and I really thank them all. It was the starter. I could not believe it considering we installed one less then a year ago (And it came from the dealer). This site is truly helpfull and ...
1954 Chevrolet 3100 235CID heads
Thanks to all who replied. After some time with a starter rebuild, we were able to start this engine to get it hot. We took the average of all suggestions. We set the intakes at .007 and the exhaust at .014. The truck runs smooth as glass. Timed it out and the...
1987 Chevrolet V30 Custom Deluxe 7.4L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GCHV33N6H
This truck has dual tanks and the tank switching valve is restricting the return fuel. Thank you al for your help hope I can help you some day. Thank You Mark
1994 Chevrolet Cavalier RS 2.2L tensioner VIN: 161JC1446R
Liftoff!! The cavalier is gone! done! We took the advice of Bob [...] and bought the 150 coco Gates alignment tool. We really needed a DEFINATE answer!! All pulleys were in line except the tensioner. All bearings were good, crank end pla...
1997 Chevrolet Corvette 5.7L Vent system VIN: 1GYY22P3T5
Well gang i will call this one fixed. I first want to thank all for the replies I first checked supply vacuum at the HVAC programmer had plenty. Upon switching modes there was no supply vacuum to any solonoids, i knew all of the doors were free and could be mo...
1998 Chevrolet Lumina 3.1L No Start VIN: 2G1WL52M6W
Thanks to all that have offered assistance. The customer has declined further diagnostic time, so we buttoned it up. All suggestions were good and we double checked as they came in. we had opportunity to look at another 3.1 although it was a 2000. As suspected...
2001 Chevrolet Silverado 2500 HD 6.0L Poor Idle Quality VIN: 1GBHK24U21
thanx for the help the intake was leaking.found a vacumn leak and we tested it by smoke test.
2005 Chevrolet Cab & Chassis Silverado 3500 6.6L no fuel transfer VIN: 255E195930
Thanks for all the help guys. I don't normally work on diesels so this was an education. Information: The rear transfer pump on this vehicle is not activated until the front tank gets below 6.6 gallons. The gauge reading is an average of both tanks. The pump o...
1994 GMC Sonoma SLE 4.3L transfer case VIN: 1GTDT19W9R
From: John from North Carolina Date: Dec 12, 2006 5:21 PM disconnect the harness at the transfer motor and jump it to see if it will engage and disengage, if so it is the electronic box. This is not easy to get to but it will tell which is the problem. it he...
1996 GMC K2500 Sierra SL 5.7L Air/fule metering system VIN: 1GTGK24R1T
Thanks to everyone that responded. We ended up finding a ground on the t-stat housing that was not making good contact. That fixed the idle issue. Also for the MIL on issue we replaced the ECU and test drove, ok for now. Vehicle has not been back. Thanks again
2000 Pontiac Grand Am SE 3.4L computer? VIN: 1G2NF12E2Y
first off thank you to all those who took time to reply, this one had somehow escaped the cinfines of my sometimes feeble mind, and your many suggestions pointing to the same general direction jump started a revolution of gigantic porportion. I don't know why ...
2001 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HX54K21
We finally fixed this one. The challenge was that it would only act up for about 30 seconds at a time. We found a faulty ignition switch causing all of the problems we have. A new switch and all is well. Thanks to all who replied. Trouble codes: P1626.
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