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Prev Professional Automotive Repair Technical Discussions for October 6, 2005
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Open Help Requests for GM
Help Request Answers
1986 Chevrolet K10 Suburban Silverado 6.2L Stall VIN: 1G8EK16C3G
We replaced engine with a used engine 6.2 diesel.We were able to get it running but when accelerate and let off (decel ) it will stall everytime. We have very limited diesel experience and are looking for some suggestions of how to go about diagnosing this con...
1992 Chevrolet kodiak 8.2L Poor Idle Quality VIN: 1GB6H1J1NJ
Hello Everyone I have a 92 cheverlet Kodiak with a 3116 cat engine. This old truck runs good if it is driven everyday, but if it sets 2 days or longer when it is started its hard to start like it has air in fuel systym, and wen it starts it will have heavy whi...
1995 Chevrolet Astro 4.3L fuel pump VIN: 1GNEL10W5S
I have this Astro van AWD that is driving me crazy. The fuse for the fuel pump always blows. I changed the fuel pump module with a new one, no change replaced it with a known good one, still blows fuse. checked the wiring didn't find a short . disconnect the f...
1998 Chevrolet Cavalier 2.2L theft VIN: 1G1JCS246W
replaced heater core theft light stayes on
1995 Geo Metro 1.0L Cuts out, MIL Lamp on VIN: 2C1MR2262S
This lil car runs fine [for one of these] for a few minutes, then the check eng lites comes on and it runs like crap! We suspected the tps, but it tests ok. When we try to retrieve codes it flashes code 12 [G.M.] for everythings fine? We cleaned computer groun... Trouble codes: 12 (all is well)
2001 GMC Yukon Denali 6.0L ride control VIN: 1GKEK63U31
Mr Goodwrench. we have a Denali with the "Service Ride Control" message on.I much rather work on Euro/Jap cars,but this was parked in my bay. We are currently testing a TECH 2 because we are tired of not getting to access body controls. Anyhow, voltage is pres...
1995 Oldsmobile Aurora 4.0L water pump VIN: 1G3GR62C3S
trying to replace leaking water pump. i have the gm socket to remove the pump but it won't move in either direction, according to shop manual & alldata it is suppose to turn clockwise to come out. i have a 3/4" 3 foot rachet on it but it still will not move. h...
1997 Oldsmobile Aurora 4.0L Stall VIN: 1G3GR62C8V
when the car is cold it starts to bogg down then dies but not often. got it in the shop and hooked it up to genysis and checked datastream nothing. car ran for about an hour and after it got hot anytime i put it in drive with brake on about 5 to 10 seconds lat...
2000 Pontiac Grand Prix SE 3.1L ignition key VIN: 1G2WJ52J2J
new to us -key stuck in ingition -replaced cylinder- worked fine for 2 days -then back- 1st.wire is okay between fuse to ign swth-12 volts at btsi fuse when the key is at on position - new column solonoid and ign sw.if you manually push the solonoid the key wi...
2004 Pontiac GTO 5.7L body VIN: 6G2VX12G64
Customer has had a idle vibration felt in the seats when in drive or reverse when engine is warmed up, worse with a/c on. Only does it at idle, if you raise the engine speed up 100 rpm then the vibration goes away. The dealer has attempted repairs 2-3 times. T...
1998 Saturn SW1 1.9L Excessive Emissions, MIL Lamp on VIN: 1G8ZH8286W
In MA they do a OBD II check for emmissions, i.e. readiness monitors and codes, the vehicle came to us with a code for P0420A Catylitic converter below efficency. We checked the oxygen sensors and both were switching at the same time, cat not functioning prope... Trouble codes: P640, P641

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Park Avenue 3.8L Charging VIN: 1G4CW52K9S
Thanks for all the help. Replacing the instrument panel took care of the light. Still not charging at idle with load. Running out of time, so customer picked up vehicle. If he returns I will try a smaller pulley on alt. In 30 years, I never had a problem like ...
1994 Cadillac Seville SLS 4.6L Hesitation, Stall, Misfire, MIL Lamp on VIN: 1G6KS52Y3R
Well, finally this is done. The repair was a used PCM. Can you believe it. Three bad PCM's from GM/AC DELCO. We tried a used one as we really believed the PCM to be the problem. Each time we replaced the PCM we cured the current problem but invoked a new one. ...
1983 Chevrolet Monte Carlo CL 5.0L electric window VIN: 1G1AZ3772D
good day! i replaced the 'master switch' on drivers side, fixed problem! thanks to all who responded to my problem.~ john [...]
1986 Chevrolet Celebrity 2.8L vacuum pump VIN: IG1AW19W5G
Thank you everyone who responded. Several people mentioned a vacuum pump for a big-cam engine, I hadn't thought of that. Kieth Mackley had the magic # for Collectors Auto Supply, 1.[...]. They have the correct part # in stock, but my customer doesn't ha...
1994 Chevrolet S10 Blazer Tahoe 4.3L pcv VIN: 1GNCS13W7R
Thank You All who answered. We finally got more history on the vehicle and found out that the customer had gotten the vehicle hot. We found that the rings were loosing seat and causing major blowby intermitantly. WE put Rislone in the oil and drove it hard for...
1994 Chevrolet S10 Blazer 4.3L Hesitation, Surge, MIL Lamp on, Code 43 -ESC Problem
Well, I wanted to post an update last night, but I see you can only do one update. Yesterday morning I had a 'no start', which it had done a few times in the few days it has been at the shop. A quick shot of brakleen and it would fire and stay running. This ti... Trouble codes: 43 (ESC problem).
1995 Chevrolet Blazer 4.3L Poor Idle Quality VIN: 1GNDT13W8S
Thanks to all that took the time to respond!!! This one is fixed. We had checked vac and found we had vac at oil cap... we then removed upper and found the lower intake bolts loose... One of them was laying inside. We replace intake gaskets and all is well. Th... Trouble codes: P0507.
1996 Chevrolet Blazer 4.3L Engine R&R
Thanks for all the replies! I was able to swap the engine without raising the body or lowering the front diff. Here's what I did: Removed the intake manifold and both valve covers and was able to gain access to the two top bell housing bolts. After breaking th...
2002 Chevrolet Monte Carlo LS 3.4L Cooling Fans VIN: 2G1WW12E02
We replaced the Body Control Module and that fixed it. It was a process of elimination. We checked the CTS, level sensor, relays, wires, power feeds and grounds, a/c, and tried leaving the PCM disconnected over night. A GM dealer replaced and reprogrammed the ...
2002 Chevrolet Monte Carlo LS 3.4L Coolin Fans VIN: 2G1WW12E02
We got it fixed by having the Body Control Module replaced at a GM dealer. They could not find the problem either but replaced the PCM, reprgrammed and when that didn't work they replaced and reprogrammed the BCM and that fixed it.
1996 Geo Prizm LSi 1.8L Hesitation, Cuts out, Misfire VIN: 1Y1SK526XT
Crank sensor ended up fixing this car. I did not pay close enough attention to the crank sensor scope pattern when i originally looked at it. the reluctor has 32 teeth and was dropping 2-10 teeth when the problem was happening. Thanks Dave.
1995 GMC C3500 Sierra SLE 6.5L Poor Fuel Economy, gutless VIN: 1GDKC34F5S
A new ECM returned my wastegate solenoid control ,only time will tell if it stays fixed.My sincere thanks to all who replied , Ted. Trouble codes: 78 (wastegate solenoid problem).
2001 GMC C3500 HD 8.1L left front speed sensor
After changing lf brake hose we test drove truck and still he left front backing plate was 100 degrees hotter than the right, we then noticed that when we pushed on the caliper it stuck at the slides, it turned out the sliders we ot the correct ones on the lf,...
1967 Pontiac GTO 428CID TH400 tail bushing
Thank you for your input. Overwhelming majority of replies pointed out what I hadn't come across; that (from the factory) most, if not all, 4x4 units (and some Oldsmobiles) came with a core/freeze plug in place of the speedo drive. Apparently the governor will...
1996 Pontiac Grand Am SE 3.1L spedometer VIN: 1G2NE52MXT
Thanks Eric [...] for you help. The cluster like you said have different code- I write the instruccion again. Key on and try to start vehicle. Vehicle will fail tp start. Leave key on and wait until thef lite stop flushing ( up to 10 minutes) THANKS ON ...
2001 Saturn SC2 1.9L Cuts out, Stall VIN: 1G8ZR12761
Hello again, I got misled when I thought the computer was turning off the f/p relay, it was not, I back probed dkgrn/wht wire coming out of ecm to relay and it never lost power. So after removing head from anal cavity I figured it must be the new carter fuel p...
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