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Prev Professional Automotive Repair Technical Discussions for March 13, 2009
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Open Help Requests for GM
Help Request Answers
2000 Buick Century Custom 3.1L power steering VIN: 2G4WS52J9Y
hard to steer to left. car came in with a broken power steering pump shaft. customer complained of hard to steer to the left before the pump failed. we installed a reman pump and bleed system, and we have the same problem of vehicle is hard to turn to the left...
2002 Buick Rendezvous CX 3.4L No Compressor engagement VIN: 3G5DA03E72
Ok folks, this one is killing me. What I have on this one is no compressor clutch engagement. This one has manual A/C not Auto air. The PCM doesn’t seem to be commanding the compressor relay on. When I go into the BCM data the A/C switch states active ...
1990 Chevrolet Corvette 5.7L MIL Lamp on, PINGS VIN: 1G1YY2383L
checked timming it was good , checked for vacum leaks with smoke machine,preformed egr backpressure check ,all checked good. found bare spot in wire and repaired has no ignition clatter know . still have egr code egr passage is clear eney help would be nice Trouble codes: 32 (egr)
1999 Chevrolet S10 LS 4.3L No Start VIN: 1GCDT19WXX
Thanks for any help in advance. This vehicle came in on the hook. Cut out while driving. Cranks but no lite. Has spark and will run if if feed it propane. I checked for injector pulse thru my Solas and no injector pulse. not sure if it is a security problem or... Trouble codes: B2973 (Cant find a code definition. I think driver door switch.)
1999 Chevrolet Metro LSi 1.3L Excessive Emissions VIN: 2C1MR5228X
hi all, i have a dumb question. this car has two cats on it, witch one controls nox ? front or back. front is in manifold, rear is in pipe. thanks, john
2000 Chevrolet Astro 4.3L transfercase VIN: 1GBEL19W2Y
This van came in with the service 4 wheel drive light on. Customer said it had been to another shop they put in an encoder motor. I checked for continuity in the wires from the module to the motor also checked for grounding in same wires all ok. Checked for co...
2002 Chevrolet Monte Carlo SS 3.8L security light VIN: 2G1WX15K22
Good afternoon. We have a 2002 Monte Carlo that the customer states the security light came on one time at start up. (NOTE: We replaced BCM 1 week ago.) Scanned BCM, B1440, B2958, B2964. Passlock sensor voltage 3.57. Vehicle is equipped with a remote start. I ... Trouble codes: B1440 (Power mode mismatch), B2958 (Passlock), B2964 (Key in Ignition)
2004 Chevrolet Silverado 1500 5.3L speedometer VIN: 1GCEK14T74
this is more of a question of will a tech 2 be needed.the problem is speedo will go up to 120 mph the will stick around 80 mph,if you shut the truck off and cycle key on and off it will eventually drop to 0 mph.i believe its the speedo head,if wrong let me kno...
2005 Chevrolet Silverado 2500 HD 6.0L No Start
Thanks in advance for any help. Truck does not start and does not crank. Problem is not starter or ignition switch related, can jump solonoid (crank no run) ignition switch has power at every terminal even disconnected, starter signal wire (yellow)at switch ha...
1992 GMC C1500 Sierra SLE 5.7L Dash VIN: 1GTDC14K5N
Rattle in center of dash area. Only present when vehicle is coming to a complete stop. Goes away after a few seconds. Moving AC/Heater mode doors and fan to different positions does not affect rattle.
1998 GMC K1500 Sierra SL 5.0L Excessive Emissions, Poor Idle Quality VIN: 2GTEK19M0W
do,se 83 psi seem high is afuel return line plugged key on eng off 60psi holds for awhile. also desired idle 650 rpm is that a bit low thought maybe 850-950 would be right .also #2 o2 sensor not communicating. runs rich but might be carboned up because of exau...
2003 GMC Envoy XL SLE 4.2L radio,power windows, power door locks rear wiper VIN: 1GKET16513
when started cold outside temp. below 32 degrees, no radiosound, but radio powers up and reads no amp found. has no power windows, power locks, and no rear wipers. after about 7 miles when vehicle warms up, problem goes away and may not happen again for severa...
2001 Oldsmobile Aurora 4.0L battery light VIN: 1G3GS64C41
Ok i need a new direction from someone relative to this platform. The car was showing a check charging system on info center,check engine oil,dash would go out,chimmer would ding like crazy,all this happens when it wants too.Customer wanted a new alternator......
1992 Pontiac Sunbird LE Value Leader 2.0L Engine VIN: 1G2JC51HXN
I'm doing an engine swap on this Sunbird and am wondering what the best way is to get the engine out. Alldata says to drop the engine and transaxle out the bottom together but it looks to me like it might be easier to lift the engine out from the top and leave...
2000 Pontiac Grand Am SE 2.4L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G2NF52T1Y
Vehicle came in with MIL on P1171, P0300. Would misfire at idle no response on acceleration. I replaced fuel filter due to it being plugged up. Vehicle still has misfire. Fuel trim levels at idle do not go more than 10%-+. Idle Vacuum is about 16Hg. When you d... Trouble codes: P0300 (Random cylinder misfire.), P1171 (Lean condition on acceleration.)
2001 Pontiac Bonneville SE 3.8L steering gear VIN: 1G2HX54K12
Hi Everyone: I have this Bonneville when driving on road and go to turn left like on a curve on the highway the vehicle will feel like you just jerked the steering hard left.This happens at about 1/4 of the way through rotation on curve and it is a sudden pull...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac Seville STS 4.6L charge indicator in dashboard VIN: 1G6KY5299T
After looking all over I found a tsb stating this is a normal operation. 02-06-03-008a Thanks to all of you who responded to me..
1996 Chevrolet C2500 7.4L vibration VIN: 1GCGC29J2T
cust has fail to return for two appointments, but I do beleive I'm going to find a out of balance ft rotor.. Thanks for the inputs, when and if I see it again I'll add the fix... Next time Adam
1996 Chevrolet Caprice Classic 4.3L Misfire VIN: 1G1BL52WXT
Turned out to be a fuel pressure regulator. I checked it three times before i asked for help. every time it was fine. I just never saw one cause a dead miss on one cylinder and medium miss on two others with random to no miss on 3 others and two cylinders neve... Trouble codes: P0300.
2000 Chevrolet Lumina 3.1L smell VIN: 2G1WL52J1Y
Thanks for the help guys. We had no idea these regulators were so common to go bad. I don't think we've ever changed one of these before. Although we never did get any proof that it was bad we went ahead and put one on and sure enough it's been a week since it...
2001 Chevrolet Impala LS 3.8L abs VIN: 2G1WH55K21
Thanks so much.Rob,Dan,Tim,John,Ken,Ted and Todd were sending me in the right direction.Although we had fixed the wires when i saw all the responses almost the same i decided i had better look at this one myself.The wire was barely rubed through at the trans e...
2002 Chevrolet Impala LS 3.8L MIL Lamp on VIN: 2G1WH55K22
The problem we had was that the post o2 was moving to fast, hense the code set, the cat was not oe but had a 3yr warranty so we replaced it. The problem was solved instantly, my concern was if anyone had this code set when it wasn't a bad cat. We rarely use oe... Trouble codes: P0420.
2003 Chevrolet Tahoe LT 5.3L headlights VIN: 1GNEK13Z23
Thanks everyone for all your input. Vehicle is repaired. After installing a new BCM, relocating grounds, repairing connector to alternator, etc, and all the hair pulling, found out we had got a bad BCM. Replaced BCM and reflashed again, and all is working corr...
2003 Chevrolet Silverado 3500 6.6L fuel tanks/guage
Hello there my fellow Technicians. After a few long days and hours the problem is corrected on this truck. I apperciate all the open insight to all the possible problems from battery acid causing havoc with voltage drops to customer education,and possible upda...
2004 Chevrolet Silverado 2500 HD 6.6L heater VIN: 1GCHK23104
Customer decided to take vehicle as is until one of us can find a higher temp set of t-stats (which I did not recommend doing but the customer insists on trying). In answer to some of your questions: 1) Both t-stats were replaced 2) I bled the system quite tho...
2004 Chevrolet Impala 3.8L blinker fuse blows VIN: 2G1WF55KX4
the vehicle was a police car and just had a new siren & light control installed I finally noticed when you put the left blinker on the siren would click with the blinker until fuse blew. Once I disconnected the control unit blinker worked fine sent it back to...
2005 Chevrolet Malibu LS 3.5L Rotor VIN: 1G1ZT52895
The primary question on this Malibu was if the front rotors could be replaced with larger OE units utilizing caliper brackets from a similar car that had the bigger brakes. Std. brakes use a 10 7/8" front rotor, optional uses a 11 21/32" rotor. Pads and calipe...
1998 Oldsmobile Intrigue GL 3.8L MIL Lamp on VIN: 1G3WS52K3W
Thanks to all who replied After reading a couple of the replies I went back and retested the ceiling at the pcv valve. I foubd that the o-ring that was supplied did not properly seal the valve and was causing the light to come on. Serched all my o-rings and... Trouble codes: P0171 (system lean bank 1).
1998 Pontiac Bonneville SE 3.8L oil pressure VIN: 1G2HX52K2W
Thanks to all that replied. I took the time to put an oil pump kit in and it raised the oil pressure and smoothed out the mechanical gauge a little. The dinger for the oil pressure alarm is not on any more but I believe the balance shaft is making noise as the...
1999 Pontiac Grand Prix GT 3.8L Misfire VIN: 1G2WP52K8X
every thatrepliedand said it was in the valve train is correct it was 2 broken valve springs. the tool that was made for checking connecting rods was quiet handy and saves alot of work. thanks to everyone that replied greatly apreiciated. Trouble codes: P0300 (random missfire).
1999 Pontiac Grand Prix GT 3.8L Misfire VIN: 1G2WP52K8X
every thatrepliedand said it was in the valve train is correct it was 2 broken valve springs. the tool that was made for checking connecting rods was quiet handy and saves alot of work. thanks to everyone that replied greatly apreiciated Trouble codes: P0300 (random missfire).
2001 Saturn L200 2.2L No Start VIN: 1G8JU52F31
Thanks again for all the help. I was trying to find this information for a business neighbor in the collision repair. To this day, we still have not found the fuel pump relay. All information shows it to be in the underhood power distribution center. It is not...
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