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Prev Professional Automotive Repair Technical Discussions for July 24, 2004
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Open Help Requests for GM
Help Request Answers
1996 Cadillac DeVille 4.6L Poor Fuel Economy VIN: 1G6KD52Y0T
All 02 sensors, changed by someone else, due to a MIL, and code set. Since that time customer complaint of poor fuel mileage. Says mileage has gone from mid 20's to 16-18 mpg. Customer is going by the onboard display. Road test seems fine. Car goes like ganbus... Trouble codes: RF256
1984 Chevrolet Camaro Berlinetta 5.0L Poor Idle Quality VIN: 1G1AP87611
The problem is the idle quality is poor. It only has 8-10 in. vac. at idle-700 rpm. If reved up to 1500 it will raise to about 12. What do you think could cause the poor vac. The cam is for an HO but it isn't that big. The vac. is also steady. No major vacume ...
1997 Chevrolet Monte Carlo Z34 3.4L Poor Idle Quality VIN: 2G1WX12X4V
WHEN THIS CAR FIRST CAME IN IT HAD A IDLE OF 1356RPM,THROTTLE AT 7%/tps at .56v. replaced tps with 2 different ones from napa,no change,so i got a gm tps having same problem.i unplug sensor and it idles down around 800rpm.i jumpered connector see voltage chang... Trouble codes: 122 (tp sensor or app sensorb ckt short), 1122 (tp ckt intermittent high voltage)
2000 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC1243Y
This vehicle came in with the MIL on and the code P0141 stored. Followed alldata testing procedures and verified proper operation. All was well with O2 and its circuit. Test revealed PCM issue. tested all powers and grounds for PCM. Replaced PCM resolving issu... Trouble codes: P0141 (O2 Heater circuit)
1992 Pontiac Grand Prix SE 3.4L No Start, Stall VIN: 1G2WJ14X2N
I have the above Grand Prix in for stalling and failing to restart when hot. Once it stalls there is no cranking RPM indicated via scanner and there is no spark. I ran GM test A-3, Engine Cranks, Will Not Run and everything checks out fine. I have proper readi...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick Century Custom 3.3L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G4AH54NL6
Thanks to all 11 respondents; general consensus agreed with what I was thinking. A reman'd ECM from Auto Value did the trick. Disconnected battery,(connections were very clean), removed old ECM, switched proms, reinstalled new, hooked up batt., and it fired ri...
1995 Buick Park Avenue 3.8L battery, Alternator not chraging VIN: 1G4CW52K9S
First I would like to thank everyone who responded! I found that the pcm was the fault, I got another pcm from another buick and swapped them. Both of them were from the same year. The pink wire from the pcm was indeed a control for the alternator. The pcm pin...
1993 Chevrolet Cavalier RS 2.2L No Start, Stall VIN: 1G1JCI442P
Hello, I'm sorry but I don't have an actual 'fix' for this car. After posting I went to work the next morning and everything worked fine. I drove the car twenty miles and the boss drove fifty miles over 2 days. Returned vehicle to customer and they have had no...
1995 Chevrolet K2500 Cheyenne 6.5L clutch pedal VIN: 1GCGK24FE3
well, this one is finally fixed, customer stopped by to say it's been fine, thanks to all you guys that responded with help, I found that you do have to push the pedal slowly down when your bleeding these or it seems you make air bubbles, I also found if I jac...
2000 Chevrolet Prizm 1.8L Lighting VIN: 1Y1SK528XY
The headlamp switch provides a ground through the light module to control beam function. Our switch was dropping the ground on high beams, replaced the switch and cured the problem.
2001 Chevrolet Silverado 1500 5.3L No Start, Cuts out, Stall VIN: 1GCEC19T61
Hey all, I was headed in the right direction! It was a bad fuel pump module. I was told to check with a vantage the amp pattern, I did and it was good compared with another truck of the same year (my personal). I was also told to check for a pinched wire har...
1995 GMC Pickup K3500 6.5L speedo
thanks again for all responses. the majority went for the drac(buffer), which turned out to be o.k. other good responses said to check for a loose reluctor in the transfer case, or scanner reading '4wd engaged' when in 2wd. thanks to tommy [...] for clearin...
1995 GMC g10 .0L chack ball locations for 1995 4L60e
I recieved a pic of the check ball locations..transmission is back together.will be installing today..Tahnks
2001 GMC Sierra 2500 HD SL 8.1L Valve body VIN: 1GTHK29G91
First, I want to thank all for the replies to this post. After checking the line pressures, dropped the pan, checked voltage drops on solenoids, and looking for any out-of-the-ordinary wear, debris, etc... I decided to change the fluid and send to dealer. (sti...
1995 Pontiac Bonneville SE 3.8L Cuts out VIN: 1G2HX52K4S
It was my gut feeling that this was an intermitant electrical problem and as the parts replaced at another shop were still under wrty I advised the customer to return to the first shop. They replaced the FP with a GM pump, also the cam sensor etc still no fix....
1997 Pontiac Firebird 5.7L headlight motor
thank you so much too all who replied.well,after some more testing,i hooked the right side wiring up to the left side light,it still stayed on.replaced motor and all is well. thanks again,you guys are great.
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