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Prev Professional Automotive Repair Technical Discussions for April 30, 2010
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Open Help Requests for GM
Help Request Answers
1990 Chevrolet Lumina 3.1L Cuts out, Stall VIN: 2G1WL54T5L
Hello everyone. I've got a pandora's box here and I would appreciate any assistance you can render me. I have this 90 Lumina 3.1 (non van) and prior to this problem it ran perfectly. This vehicle will start and run perfectly until it is accelerating. Once you ...
1990 Chevrolet K1500 Scottsdale 4.3L Excessive Emissions, Surge, Poor Fuel Economy VIN: 1GCDK14ZLE
Greetings techs. I really hate to post this request but this thing has eaten our lunch all afternoon. Came in with the complaint of suddenly having very bad surging/bucking, black exhaust, not able to get over about 40 mph. Heck this should be simple but NOOOO... Trouble codes: 45 (Rich)
1991 Chevrolet S10 Blazer 4.3L Poor Idle Quality, High oil pressure VIN: 1GNCS18Z7M
Hey everyone. Just a quick question for you guys. I have a 91' s10 with the TBI 4.3 and the complaint is unusually high oil pressure. The pressure starts off at about 40 then after 10 minutes it climbs to 80 under acceleration. While at idle or when off the ac...
2003 Chevrolet Avalanche 1500 Z71 5.3L Heat VIN: 3GNEK13T33
Hey guys need help with this one. Got this one from another shop. Vehicle has dual zone automatic heating/ac system and customer complaint is that if you turn both knobs to full heat (90 degrees)everthing is great...verified by putting temp gauge into vent and...
1997 GMC K1500 Sierra SLT 5.7L MIL Lamp on VIN: 2GTEC19R9V
I replaced the intake manifold gaskets on this vehical,it started right up and runs great but the check engine light came on right away with and code of p1345 ckp/cmp correlation problem.ok i think that I did not get the dis back in correctley.@nd problem is t...
2007 GMC Sierra 1500 Classic SL 4.8L Poor Idle Quality, Cuts out, Stall, Misfire VIN: 1GTEC19V97
Help just had a customer drop off his truck, wont idle and stalls,has misfire on scan tool cyl 1,3 and [...] or 8 but mainly 1&3 assumed cat was plugged pulled 02 was quick and easy ,not the problem, plugs baddly fouled plugs had replaced them first, same... Trouble codes: P0300 (multiple misfire)
1994 Pontiac Bonneville SE 3.8L cluster lights VIN: 1G2HX52L5R
When i key the vehicle up and turn the running lights on the cluster lights flicker for about one min, then they will stop and act as normal. if i turn the lights off and try to make it act up again it wont, the car has to sit for arond five min off in order t...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP54K91
Pulled no. 6 plug and done compression test. Have 100 psi which is min. compression for this engine. Compared to no. 1 which is 160psi. Misfires have dropped to single digits andis not setting a misfire code . Customer has decided to drive car the way it is. T... Trouble codes: P0300.
2005 Buick Terraza CXL 3.5L Steering VIN: 5GADV33L75
Thanks for the replies to our request. The fix turned out to be a rack and and pinion from GM even though we had the existing rack rebuilt locally. The lines were replaced too even though we could not verify any restrictions. But even after the hoses were repl...
1991 Chevrolet Camaro Z28 5.0L break out box VIN: 5123263881
i was having problem with knock sensors but wound up using a volt meter taped into wires had a bad knock sensor
1995 Chevrolet Astro 4.3L Poor Idle Quality, Surge, Cuts out, Stall VIN: 1GKDM19W3S
Thanks to all who helped on tis one. I think my next investment is a secondary pickup for my Vantage one. I think I could have determined that it was fuel and not spark. Anyway this van was heavy with soot all through the intake and after cleaning it runs fine...
1997 Chevrolet K2500 Silverado 5.7L Fuel Guage problem VIN: 1GCGK24R2V
Hey guys... Thanks so much for all your help. It did end up to be the IP cluster. From what I understand from TSB 73-83-15 the anti slosh module is in the IP cluster.I got one from the bone yard and it smoothed it out perfectly.I put the old sender in and w...
2001 Chevrolet Malibu 3.1L Water pump VIN: 1G1NE52J31
Thanks for the replies. Turned out I went with my gut feeling on this one and replaced the front cover. and the noise is gone. There was a very slight rub mark dead center on the back of the housing where the shaft was making contact. My guess is housing wa...
2001 Chevrolet Silverado 1500 LS 5.3L drops into neutral at cruising speed VIN: 2GCEK19T41
Some times we just overlook the obvious cause it would be to simple what I found was the rear third member is shot have not tore into it yet but apparently ther is enough slop in it that it will let the truck coast and then grab again funny thing is the rear a...
2003 Chevrolet Silverado 2500 HD 6.0L Charging VIN: 1GCHK29U33
sorry it took so long but i can never get in touch with this lady.the new alternator was bad. replaced with oem part. all is well. thank you for all your help.
2002 GMC Yukon Denali 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GKFK66U92
finally got this one fix sorry about the delay the problem was when i looked at the fuel trim it was at +52 on the right bank which led me to o2 sensor air and fuel when i disconected it the car level off so i replace o2 and that fix my problem thanks to all w... Trouble codes: P0300 (Multiple random misfire).
2003 Hummer H2 6.0L Temp Gauge VIN: 5GRGN23U13
Most replies indicated that the instrument cluster was most likely at fault. One key indicator to suppport a bad cluster was if the gauge did not drop to 0 with key off. Customer has not returned vehicle and proably won't. I will reopen if he does. Thank you t...
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