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Prev Professional Automotive Repair Technical Discussions for August 17, 2005
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Open Help Requests for GM
Help Request Answers
1998 Buick LeSabre Custom 3.8L cylinder VIN: 1G4HP52K8W
front head,center cylinder full of coolant,how do you determine if problem is intake manifold or head gasket
1979 Cadillac DeVille 7.0L gas gauge VIN: 6D47599286
Hello friends,we have a real clean 79 cadillac deville 2 dr in for a defective fuel gauge.We were wondering if anybody had any wiring diagrams for the fuel gauge,also how the heck do you get the top dash pad off this boat.We want to check the actual fuel gauge...
1987 Chevrolet G10 Chevy Van 5.0L blown fusible link VIN: 1GNEG25K4J
I need some help here. This van is blowing the fusible link that feeds the ignition switch and the taillight fuse. the owner had installed a fuse holder in place w/30 amp fuse in it and it has blown it 3 times. I checked the wiring harness for any signs of a s...
1989 Chevrolet Beretta GT 2.8L No Start VIN: 1G1LW14W9K
This beretta was parked about a year ago because of a tcc problem and a bad fuel pump. The car sat for about a year then when had need to fix the car the fuel pump, tank, and sending unit were replaced. Car then did not start. Now I have replaced the crank sen...
1993 Chevrolet K1500 Cheyenne 5.7L Petal Feel VIN: 1GCEK14K8P
This vehicle came in with a spongy pedal/low pedal concern. The frong and rear brake linings were all in bad shape (cracked, thin, etc.) I did a complete rear brake job with wheel cylinders, bleed the system, and adjusted them up tight. Front recieved new lini...
1993 Chevrolet Cavalier Z24 3.1L Poor Idle Quality VIN: 1G1JF14TPP
The car runs fine just takes a spell and idle very rough. For about 15 or 20 seconds. The o2 sensor will drop of to 4 mvolt and hang there, idle step will go to 0 , and some times map voltage goes to 2.25 to 2.50. It will suddley sriaghten out and run fine,for...
1994 Chevrolet S10 Blazer Tahoe 4.3L No Start, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GNCS13W5R
Came in on tow. Would start and idle for about 15 seconds then stall. Pushing or Pumping the gas made no difference. Would start, hi idle then cut out. We added propane and it would stay running on propane. We limped it into the shop. By this time it was warm ...
1996 Chevrolet Express 3500 6.5L pressure control solenoid VIN: 1GBLP37FXT
Thanks in advance for any help.I am not the most familiar with transmission problems and I want to make sure I send this customer away happy.He had tranny rebuilt by a national rebuilder(name withheld)And it only made it a month.Was towed to me to diagnose pro...
2001 Chevrolet Blazer Xtreme 4.3L door locks,horn VIN: 1GNCS18W61
Horn Chirps and lock cyle while driving since battery was replaced.Problem happens 6-8 times codes in bcm or ecm everything appears ok with wireing system.Has anyone seen a concern like this? Thank you for your time
2002 Chevrolet Silverado 2500 6.0L ac belt VIN: 1GCHC24U62
The problem is this; When engine is reved up,with the ac on, the ac belt snaps the tentioner to its fully released position repeatedly causing a loud noise. This was the original complaint when it was brought in and it is still doing it after replacing the ten...
2003 Chevrolet Silverado 2500 HD 6.0L srs VIN: IGCHK29U93
This truck came in with a air bag light on. We tried to retrieve codes and could not. We have a snap on MT2500. called Identifix and they said should be no problem with communication snap on diagnostic said the same thing. we replaced module and light is still...
1992 Oldsmobile Bravada 4.3L Surge VIN: 1GHDT13WON
Thanks For Your Help- This truck has a heavy surge at idle, worse with more load. Worse in drive worse w/ a/c on. Tested O2 sensor, very lazy almost inactive, replaced, no change, though it did smell better. Disconnected IAC, surge stopped. Removed IAC and pi...
1998 Oldsmobile Bravada 4.3L Poor Idle Quality, MIL Lamp on VIN: 1GHDT13W2W
Owner brought car in having had it to other shops.Original complaint was for a bad overheat, missing, and MIL on(his daughter was driving the truck).Water pump was put on and a complete tune up. Still missing so it got a crank sensor and ecm and coil. Still mi... Trouble codes: P0300 (Random Misfire)
2001 Pontiac Grand Prix GT 3.8L steering VIN: 1G2WP52K21
Vehicle drove fine at this time. Could not dupl. customer complaint but know this customer doesn't make things up. Wondering if anyone has run across this type of problem before.
1996 Saturn SL1 1.9L Cooling Systems VIN: 1G8ZH5286T
this vehicle came to our shop with engine oil mixed into the cooling system .pressure test revealed nothing, no loss of pressure . diagnoses ( experence & phone calls to the machine shop ) was that there is a head / gasket problem. we replaced the head gasket ...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Regal LS 3.8L 3-4 shift VIN: NO VIN
I would like to thank each one of you that replied to my request for help. They were very informative and helpful in making my decision to replace the trans with a known good used unit. I replaced the trans along with the filter and test drove. Everything is b...
1992 Cadillac Fleetwood 4.9L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Stall, MIL Lamp on VIN: 1G6CB53B9N
Well its Fixed the caddie from heck is done, The fix was to replace the coolant sensor and to replace the main computer, The replies were to many to single out. But everyone seamed to have seen this before. Thanks Again Mark Trouble codes: 12 (codes 1519 21 26 31 38 52 53 73 74 97 99 stored).
1990 Chevrolet Cavalier Z24 3.1L Poor Idle Quality, Cuts out VIN: 1G1JF14T1L
It turns out that after checking and rechecking all of the wiring that the injector power circuits for BOTH banks were nearly broken inside the insulation. The wires were hanging by literally one strand, but the insulation was not even suspect. I just got luck...
2000 Chevrolet S10 2.2L abs module VIN: 1GCCS195XY
hi group got a couple of responses heres what we found, went back and rechecked signal at pcm with labscope on speed sensor lines ok no drop outs or glitches, rechecked all power and grounds again, signal out of pcm to abs module looked great also, so bit the ...
2001 Chevrolet Express 1500 4.3L Stall, INTERMITTANT STALL VIN: 1GCFG15W91
WE CHECKED OVER AL [...] WHO READ!! Trouble codes: U1016 (loss of comunication).
2003 Chevrolet Express 1500 4.3L Distributor VIN: 1GCFG15X93
Thank's for all the replies!! We checked cam gear and oil pump, everything seems to be fine. Most everyone has replaced distributor without any trouble, thats what we chose to do. Several replies said it was from lack of oil changes and or soft gear metal?
2003 Chevrolet Silverado 2500 6.0L Poor Idle Quality, Stall VIN: 1GBHC24U23
wow everyone but one said to clean the trottle body yes it was very dirty and the truck idles great thanks for everyone that took time to help
2002 GMC Envoy SLE 4.2L Hesitation, MIL Lamp on VIN: 1GKDT13S82
Sorry to end this way but time is running out. I spoke with customer and after a dealer reflash and cmp sensor there seemed to be no improvement. Thanks to all the replies like bad ignition swiths and the o2s causing the hesitation and these trucks seem to hav... Trouble codes: P0340, P1523, B1440, B2961, P0171.
2000 Oldsmobile Intrigue GLS 3.5L evap case VIN: 1G3WX52H1Y
It' done. Thanks for taking the time to look up the procedure and send it to me. The problem was the brake pedal pivot bolt. After I removed it things went rather smoothly. What a job though, I must have cut my self 10 times on the cross beam. Thans again.
2002 Pontiac Grand Am GT 3.4L front right hub VIN: 1G2NW12E22
Thanks again for all the input. Seems the noise must be in the brake system. They drove the car for a week and called and said the noise was gone. i Balieve it has to do with aftremarket brake parts. The bearing was fine no change when it was loaded by turning...
1991 Saturn SC 1.9L No Start VIN: 1G8ZG1470M
I would like to thank all those who have replied. This one is still kicking my butt. It ends up that it has several problems. I got the ignition system working. It had one shorted coil and a bad module. After getting the ignition working it still would not sta...
1997 Saturn SL2 1.9L Electronic VIN: 1G8ZK5276V
We relaced both vss & oss with new sensors,still had the concern we ohm out wireing from each sensor back to ecm in dash,all wireing check out ok,we found after putting back together that concern was much more frequent,so we took a closer look at wires and fou...
2000 Saturn LS2 3.0L Misfire, MIL Lamp on VIN: 1G8JW52RXY
that you for all the help. when we pulled the top off to check coil for 2 4 6 we did a compression check and found 90 or less on all 3 cylinders. needed a timing belt and tensioner was bad and let the belt loosen enough to loose compression. Trouble codes: P0300, P0302, P0304, P0306.
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