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Prev Professional Automotive Repair Technical Discussions for June 14, 2005
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Open Help Requests for GM
Help Request Answers
1996 Buick Century Custom 3.1L cooling fans VIN: 1G4AG55MT6
hay to everybody out ther today making a living the hard way. i have a question for all of you. i am working on this buick and i have no power to the pink wire at the fan relays. from the shop key system it tells me that there is a 10a. fuse taped to the harne...
1997 Cadillac Catera 3.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: W06VR52R0V
I am posting this for another shop. when warm idling has a miss on cyls 1,3,& 5 when cold no miss under load no miss checked for vacume leaks, ckecked compresion checked ignition system all good, runs good all but warm idle. thanks Ron Trouble codes: P0300, P0301, P0303, P0305
1991 Chevrolet S10 Blazer Tahoe 4.3L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13Z0M
I cannot get this truck to go into closed loop fuel control. The only scan data that doesn't make sense is O2 voltage. Snappy scanner shows .453 mv, never changes, regardless of engine temp or engine rpm. By backprobing near the computer(bed-of-nails clip on g...
1992 Chevrolet K1500 Suburban 5.7L t.v. pressure VIN: 1GKEV16K6M
i have a 700r trans that i just rebuilt. its back in the vehical. it shifts fair with a soft 2/3 up shift not a big concern could be better.with a pressure gage on the unit min.tv pressure is 75 psi in park,nuetral, od and man 3rd.pulling the tv cable to max p...
1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L Surge, Misfire VIN: 2G1FP22PXP
Hello again and thanks for taking time to read this. This Camero has a chuggle at 45 MPH approxmately 1500 RPM. This is shortly after shifting into fourth gear and the converter is locked in. If you go above 50MPH the symptoms are gone. It doesn't feel like a ...
1994 Chevrolet S10 4.3L Poor Idle Quality, Surge, Stall, Misfire VIN: 1GCCS14WXR
This vehicle came in from another shop with a poor idle, misfire,surging and stalls. Initial inspection turned up an open plug wire and badly worn plugs. After tuning up car it ran better but still has intermittent misfire at idle, kind of like a cylinder drop...
1996 Chevrolet Lumina 3.1L Misfire, MIL Lamp on VIN: 2G1WL52M6T
hi guys any info on this would be appreciated.the car came in this morning with a PO300 cylinders 2 and 5 were misfiring.i swapped out the 5,2 coil still no spark put on a control module still no spark left the module on and put a new coil on 5,2 and we got sp... Trouble codes: P0300
1996 Chevrolet Corsica 2.2L compressor VIN: 1G1LD5549T
After the second reman compressor went out (each fried the bearing after about 10,000 miles) I put on another by a different manufacturer. I flushed system and replaced receiver/drier. After charging, I have high readings on high side pressure, and if I bring ...
1998 Chevrolet Express 3500 5.7L rear brakes VIN: 1GBHG31R5W
The vehicle came back about a week later with sticking and pulsating rear brakes. We turned drums and sanded shoes. Came back a week later with same problem took it apart -still nothing visibly wrong. Then, set star adjusters all the way in, vehicle cam back n...
2000 Chevrolet Monte Carlo LS 3.4L air vents VIN: 2G1WW12E2Y
a\c and htr -- air only blows on floor vents.defrost air still only on floor. a\c sys. was completely empty.charged system and saw problem.very little air comes out of top vents,does not matter where control knob is set.any help would be apprieciated!
2000 Chevrolet Impala 3.8L Misfire, MIL Lamp on VIN: 1G34786K3Y
This impala is driving me nuts..cust came in with simple complaint that has steadily spiraled down hill!check eng lighton. Drove car in & immeadiatly new it had a misfire code. scanned for codes found cyl#4 dead. cehcked basics spark ok,pulse to inj ok,removed... Trouble codes: P0300
2001 Chevrolet Prizm 1.8L compressor VIN: 1Y1SK52881
tested voltage readings to ac control module. all voltages are correct except pin 3. should read 10 -14 volts with ac switch on and ac engaged. this is the pcm ac cut out. the computer is grounding this wire and wont let the compressor turn on. the parameters ...
2001 Chevrolet Cavalier LS 2.4L 1-2 2-3 3-4 shift VIN: 1G1JF52T91
Help me please. This thing shifts very hard all the time. The fluid is full and clean. I took it to the trans shop and they noticed that the load value was staying high,90% and told us to try a MAP sensor. Well it didn't work. According to the scan tool the ...
2001 Geo Prism 1.8L Hesitation VIN: 1Y1SK52881
This Geo ( Toyota ) has a tip in hesitation exactly like an old carb engine with a bad accel. pump, or a dead vacuum advance. Its worse on first start up, but never goes away. Low mileage car, I checked the basics, no codes. Thanks for any insight.
1998 GMC K1500 Sierra SL 5.7L No Start, Poor Idle Quality, Misfire VIN: 2GTEK19R0W
Here we gooooooooooooo!!!. This truck had an intake leaking really bad. It was unknown about how much it overheated. Replaced the intake gskts and it had a rattling noise when started. After further testing the owner wanted a reman. I pulled the engine, cleane...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick LeSabre Limited 3.8L tcc lockup VIN: 1G4HR52K2V
After a lot of searching and some good replys from others, we definintly have something wrong in the valve body. When the customer brings back the car we will have to pull the trans again. Most likely we will be getting a new valve body for it. One good post s...
1999 Cadillac Seville STS 4.6L Modules VIN: 1G6KY5491X
Thanks to all who took the time to reply to this problem. As it turns out due to the intermittency of this problem we talked the customer into leaving the car with us for a week. We exposed & disconnected 10 different modules & tested the following morning for...
1982 Chevrolet Corvette 5.7L No Start VIN: 1G1AXY878L
Well, its fixed. Back to the basics. After I sent the update, I thought there has to be a clue in the MAP. As I said, there was no change with removal of hose. Since I know these old computers are slow & scan data is even slower to show up. I previously disreg...
1988 Chevrolet R30 Silverado 7.4L Poor Idle Quality VIN: 1GCHR33N5J
thank you guys, great help. alot of you guys nailed it on the head. the min. air was set to high, even dough the plug was still their, someone had raised it with channel locks from the backside of the stop screw. used the thexton idle air plug to block the hol...
1997 Chevrolet Astro 4.3L limp home VIN: 1GNEL19W5V
thanks for all your help. the main plug was loose on the trans. pushed it on tight and fixed van. go figure..
1997 Chevrolet Monte Carlo LS 3.1L No Start, Cuts out VIN: 2G1WW12MXV
I am amazed at the response within a few hours. And every reply hit it on the nose. I also got several good ideas about how to check for volume, amperage draw, and pump speed. Unfortunately I didn't get to try any of them because when I tried to move the car M...
2002 Chevrolet Trailblazer LS 4.2L blower moter VIN: 1GNDS13502
hello fellow techs. finnally got a complete failure from ignition switch lost feed from ignition switch feed from terminal g to system bus on rear fuse panel witch also feeds abs module looks like this will be a common problem with this vehicle and yes Martin ...
2000 GMC Jimmy SLS 4.3L Hesitation, Cuts out VIN: 1GKCT18W9Y
thanks to all most of you all said fuel pump but to me 60psi is in spec took car for ride and when it started bucking i unpluged the maf sensor and it ran better so i took achange so for 3 days now no problems so thanks to all again all of you are great
1996 Pontiac Grand Am SE 3.1L Stall, Misfire VIN: 1G2NE52M5T
thanx to all the guys for the input i sat back and thought about this one and figured maybe a module? well sure enough took module off and found several cracks replaced it now car runs perfect. so thanx for all the input
2002 Saturn L200 2.2L engine "rev" limit VIN: 1G8JU54F42
well, my wife gave me the saturn to look at. under load the engine vacuum did not come back. I loosed the manifold connection at the inlet of the converter, test drove with all the power in the 2.2 is designed to muster. The mileage is 46k so off to the dealer...
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