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Prev Professional Automotive Repair Technical Discussions for September 9, 2011
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Open Help Requests for GM
Help Request Answers
1995 Buick Regal Custom 3.8L Poor Idle Quality VIN: 2G4WB52L2S
This vehicle is killing us. The complaint was when you let off gas pedal the vehicle does not slow down until you press brake pedal. We found sticking throttle cable, replaced it, have checked all sensors, found IAC connector was repaired by someone else with ...
1988 Chevrolet Cavalier Z24 2.8L No Start VIN: 1G1JF31W8J
Alright we have an 88 chevy cavalier that ran when in came in the shop we replaced the engine with a jasper reman and now we cant get it to start the engine spins but wont start we have 175 pounds of compresion it has an injector pulse and fuel pressure it als... Trouble codes: 12 (no dist. ref pulse or engine speed)
1989 Chevrolet C1500 Silverado 5.7L Cruise Control VIN: 1GTDC14K3K
This one has me stumped. The Cruise Is Inop. I found that the switch wasnt working so I hooked up a new switch and still nothing. The switch is functioning right but the servo is not doing anything. So I got a servo from a salvage yard and have the same probl...
1991 Chevrolet Corvette 5.7L Hesitation, Surge, Cuts out VIN: 1G1YY2383M
Hello everyone! I want to thank everyone in advance for the input. This corvette came with a complaint of hesitation on accel. After checking the basics (ie timing, vacuum, fuel pressure) went for a test drive with scan tool and found timing being retarded bac...
1992 Chevrolet Camaro RS 5.0L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1G1FP23E5N
customer stated when vehicle is cold, engine misfires backfires. will not stay running on its own. idle surges up and down.once vehicle warms up symptoms seem to go away. replaced coolant temp sensor, map sensor, iac sensor, wires ,and fuel filter,cap, rotor a...
1994 Chevrolet P30 454CID Steering VIN: 1GBKP37N8P
This vehicle came to us about a month ago with no power steering and no brakes. We replaced the power steering pump and the steeing was ok but the brakes made the pump howl. We then replaced the hydroboost and all was ok. Owner took motorhome and came back abo...
1995 Chevrolet S10 4.3L rear brakes VIN: 1GTCS19Z3S
after repairs customer said rear brakes lock up on lightest touch rechecked an instaaled another set of shoes test drove an no problem customer got truck back 1 week later same problem trucked back in again cant find anything mechanical wrong pulled power from...
1999 Chevrolet P30 5.7L 1.210 VIN: R1X3300882
Cust says the front brake's keep locking up and smoking and he had the front brake hoses and two front calipers and had a tech tell him he needed a hydro booster i think it needs a proportioning valve anyone can help with some ifo it makes more to me to replac...
1999 Chevrolet K1500 LS 5.7L compression VIN: 1GCEK19R4X
no compression in cyliders 4 and 5 I mean 0 but the rest are good puller o2s out changed cap and rotor first thinking it was cross firing so i decided it needs heads but i got to thinking if my timing chain jumped would I only lose 2 cylinders or would it be w...
2002 Chevrolet Silverado 1500 4.3L Severe lack of power VIN: 2GCEC19WX2
I have this silverado with a 4.3l that has a severe lack of power. I am at whits end i have tried every thing i know and are clueless as to why it is so gutless. I have cut holes before the cats to see if it was plugged cats,no change. checked for vacume leaks...
2004 Chevrolet Silverado 1500 4.3L Excessive Emissions, No Start, Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1GECEC14X1
This truck quit going down the road. On check-out it would spit back through intake when cranking. Scaned for codes and got P0016 cam sensor out of time. removed dist cap and found rotr would turn severa(20-30) degrees. Cranked engine and rotor turned about ah... Trouble codes: P0016 (Cam sensor out of time to Crank sensor)
2002 Pontiac Montana 3.4L trac control VIN: 1GMDX03E2D
We replaced it with a used unit and when it was come it was working great. now customer returns and the traction control light doesnt come on in the dash when they switch it off and on mannually. with scanner hocked up and switching it the scanner shows it is ...
2003 Pontiac Vibe GT 1.8L Hesitation, MIL Lamp on VIN: 5Y2SN64L23
car has been coming up with code p0171 on and off for about a year now. has been checked at other shops but doesn't sound like anything has been found ever or replaced. car runs ok but does have slight hesitation only intermittantly when under light throttle a... Trouble codes: P0171
2003 Saturn Ion-2 2.2L Alternator VIN: 1G8AJ52F83
This car came in not charging, with the battery light on. Customer stated that he just had the alternator off and brought it in to the local alternator shop and tested it "said to be good". I received two trouble shooting flow charts and a wiring diagram from...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Chevrolet Blazer 4.3L Surge, Cuts out VIN: 1GCCT19W65
i replaced the fuel pressure regulator and it fixed the truck, thank you all for the help.
1995 Chevrolet S10 4.3L No Start VIN: 1GCDT14W4S
First off i want to thank everyone who replied,we took in to consideration all replies, went over everything again and all looked good, since there were problems with the spider connector we decided to replace it, also the fuel lines had a bit of rust nothing ...
1997 Chevrolet Tahoe 5.7L 4x4 indicator VIN: 3GNEK18R8V
Replaced the select buttons and that fixed it. It must had been making bad contact in switches them selves. Thanks for all your replies.
1999 Chevrolet K2500 Suburban 7.4L lower contro arm bushings VIN: 1GNGK26J1X
the machine shop bored out the bushing holes to make the bushings fit into the lower control arm. allowing us to find the proper bushing for the lower control arm. thank you for your replies.
2003 Chevrolet Silverado 1500 HD LS 6.0L Hesitation VIN: 1GCGK13U13
Upon further inspection we removed the the crankshaft position sensor and inspected the reluctor wheel. We discovered that some of the blades where bent out of shape, some were close to each other and others were spaced apart. We used a flat head screwdriver a... Trouble codes: P0336 (Crank sensor 18/24).
2004 GMC Sierra 2500 HD 6.6L Poor Idle Quality, Misfire VIN: 1GTHK23264
Thanks for all the help. In the end it was a scan tool problem. My modis was telling me that it was turning off #2 injector when actual fact it was turning off #1 (This is why i replaced #2 injector in the first place). I had a fellow tech bring his Tech2 over... Trouble codes: P1223, P1226, P1229, P1232, P1235, P1241.
1993 Oldsmobile Bravada 4.3L Poor Idle Quality VIN: 1GHTDT13W3
thanks for the part number now i no he wont have carbon problems any more also put a new delco egr on it no more check engine light thanks chris Trouble codes: 32 (egr system problem).
2006 Pontiac G6 GT 3.5L Battery draw VIN: 1G2ZH15886
For those who are interested here's "the rest of the story". This car was from another shop who brought it over with the complaint of, "Battery has a draw on it". Visual inspection showed a brand new battery installed in July 2011. I jumped in with both feet ...
1994 Saturn SL2 1.9L No Start, Cuts out, Stall VIN: 1G8ZK5578R
Thanks to everyone that took the time to help, especially Ron, Matthew and Francis. We removed and replaced electrical connectors at ignition module, 6PIN connector PT751/ [...] 5PIN PT1072 [...],we replaced the ignition wires,we tested the car for two ... Trouble codes: 19 (6X Signal fault.), 42 (Bypass line error), 48 (Info flag - reference pluse error.).
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