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Prev Professional Automotive Repair Technical Discussions for May 23, 2004
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Open Help Requests for GM
Help Request Answers
1998 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1G4HP52K4W
Hi Guys, This car came in with all the listed codes & a pile of receipts from other garages. This Buick has an interrmittent MIL that comes on. The three sensors corresponding to the codes are on the same 5V. reference line, although when I backprobe it at th... Trouble codes: P0107 (MAP sensor low voltage), P0122 (TP sesnor low voltage), P0452 (Fuel tank pressure sensor performance), P1107 (MAP interrmittent low voltage), P1122 (TP sensor interrmittent low voltage), P1635 (5 volt reference line)
1998 Buick Century Custom 3.1L abs and master cyl
Did front pads, clean & adjust the rears, and attempted brake fluid flush. I pushed in the piston pushing the fluid back to the master. No fluid will come out the wheel cylinders for anything. If i opened the lines for the rears at the abs unit and no fluid co...
1995 Chevrolet Blazer 4.3L Poor Idle Quality, Cuts out, Stall
Asking some questions I found out there is a fix that works.There is amodification for the EGR valve gasket made by Tomco ,which is no longer in busness.G.M. has TSB to correct the problem,but I can't get a hold of it.Too much carbon is causing the problem.The...
1999 Chevrolet K1500 Suburban 5.7L All Shift when Hot VIN: 3GNFK16R8X
This transmission seems to shift harsh when hot on long trips. Went to LA and after about 4 hours of driving check engine light came on. Had to wait till I got home and pulled P1870. During driving, monitored slip of TC with Modis. Slip is always in spec. Neve...
2000 Chevrolet Tahoe LT 5.3L engine VIN: 1GNEK13T6Y
this tahoe has a slight vibration at idle or a little above in drive.its just like a hose or line vibration on the body.i have cked everything and narrowed it to either the engine or exhaust.i removed the drive belt and no change.anyone had this problem. thank...
1997 GMC C3500 Sierra SL 7.4L Lifter noise VIN: 1GTHC39JXV
Vehicle lifter noise on startup, seems 4 -5 lifters making clearance / ticking noise. Quites a little after warmup, however still there. ??? Recommend Marvel mystery oil / lifters / cam bearings / Rocker studs ??? Oil pressure 20 at idle & 60 when running. T...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Chevrolet C3500 Cheyenne 7.4L Door locks VIN: 2GCHC39N7L
I received one offer of faxed wiring diagram. Also two suggestions of door lock switch failure. Unfortunately I was required to go on the road, for a summer job, before either opening the doors up, or getting the fax. I will get into the repair later this summ...
1995 Chevrolet Corvette 5.7L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G1YY32P5S
Many thanks for the replies. I have added additional grounds to both front ho2s, driven the car 70 miles and all is well-so far. O2 scan activity is flawless, car runs great! I did check items listed in other replies, brought up no new gremlins. Thanks again f... Trouble codes: 63 (bank 2 o2 circuit), 64 (bank2 o2 lean).
1986 Oldsmobile Delta 88 Royale Brougham 3.8L No Start, Poor Idle Quality, Cuts out VIN: 1G3HY693XG
Hey guys thanks for all the helpful replies. Well here goes. The timing chain did jump. Underhood decal shows the correct type of module and coil. The 86 olds 3.8Liter takes a Magnavox type coil. I also installed a new computer due to the fact my injector puls...
1998 Oldsmobile Bravada 4.3L Electronic VIN: 1GHDT13W1W
Thanks to Allen from North Carolina who suggested that I look at the air mix motor. The main gear assembly was cracked, binding up the motor, causing the constant heat problem. New motor is in and system is working great. Thanks to all who replied with their s...
2002 Pontiac Grand Prix GT 3.8L traction control VIN: 1G2WP52K12
We have released thje vehicle to the customer with the explanation (as most of you suggested) that the abs pump is just going through a self check. We did replace the right front wheel bearing due to very slight play which did not change the complaint any. One...
2000 Saturn LS2 3.0L mil VIN: 1G8JW52RXY
well this is going to be called fixed! I was waiting to make sure it was fixed, what happened was after 3 drive cycles the light went out by itself, i still dont know why i couldnt clear the codes with the snap-on red brick, but it wouldnt do it. I seem to rem...
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