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Prev Professional Automotive Repair Technical Discussions for October 30, 2006
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Open Help Requests for GM
Help Request Answers
1985 Buick Somerset Regal Limited 3.0L No Start VIN: 1G4NM27L7F
Cranks no start cold, will start warm if you can get it to run, but lacks power and stalls, runs rough and rich. C3I ignition, type 1. new coil and wires. checked crank and cam signals at ign module w/voltmeter when cranking, both fluctuate between 2-4 volts. ...
1988 Buick Century Limited 3.8L Poor Idle Quality, Cuts out, Stall VIN: 1G4AL513OJ
We have a 1988 Buick Century 3.8 thats turned into a headache, car came in for a no start (very hard to start)condition, during our first attempt to start we found that it would start if you held the gas pedal to the floor. Once started the car would run poorl...
1994 Buick LeSabre Custom 3.8L Misfire, MIL Lamp on VIN: 1G4HP52L1R
Hey group,got G M troubles again,came in missing while driveing under a load, can also power brake in shop and get same concern.checked for TSBs none found for this concern.looked at pids found tp sticking so we replaced that knowing it would not fix concern b... Trouble codes: P0755, P0123, P1406
1994 Chevrolet Camaro 3.4L Excessive Emissions VIN: 1GCNCR2345
Posting for another shop so I apologize for the lack of info. Car failed dyno emissions test for high nox at both speeds. Cat was replaced with an aftermarket cat with no change. Tech can energize egr solenoids on the dyno and drive the nox down to 300 or 400....
1995 Chevrolet Monte Carlo Z34 3.4L Poor Idle Quality, low power VIN: 2G1WX12X2S
Dear Fellow Techs; This car was in a couple weeks ago for a water pump and timing belt. We have the special tools to lock the cams and used them to time the cams like the repair information gives; with crank pulley at TDC, loosen the cam sprokets, time the rea...
1995 GMC K2500 Sierra SL 6.5L No Start VIN: 1GTGK29F1S
This pickup has a shorted fuel solenoid,it will pull 27 amps.I can make it start by powering up the solenoid with a jumper but the wires get hot fast.The local diesel specialist tells me that I need a rebuilt pump because i can't just replace the solenoid.Is t...
2000 GMC Yukon XL 2500 SLT 6.0L Fuel Gauge VIN: 3GKGK26U9Y
I have a Yukon XL that has a gas gauge that stays on Empty and the low fuel light is on. Usually this is a no brainer either sending unit is faulty or the little motor that drives the gas gauge is bad, not this time. I have swept the gauge with the Tech2 it wo...
2000 Saturn SL1 1.9L engine VIN: 1G8ZH528XY
Car came in for oil change. We found coolant contaminated with oil. Found no reason except for possible head gasket. Disassembled and inspected head gasket. Partial deterioration on gasket near coolant port. Had head resurfaced and pressure tested to hold 90 p...
2005 Saturn Ion-1 2.2L No Start VIN: IG8AF52F85
I have TechII tool updated, but I need to know the exact procedure used to program a new PCM. I've been told by some other people that this is a tricky one procedure, and It has to be programmed using pass thru procedure, but this is my first time doing it and...

Fixes & Summaries for GM
Fix/Summary Answers
1986 Chevrolet Corvette 5.7L Excessive Emissions, Surge, Misfire VIN: 1G1YY078XG
hi group, we performed a cylinder contribution test and found that #5 was not doing much, pulled plug wet with oil, compression 185 psi dry, wet compression 245 psi, cleaned plug off and reinstalled and now cylinder works for a little while then dies again, sp...
1991 Chevrolet Astro CL 4.3L Poor Idle Quality, Hesitation, Cuts out VIN: 1GNDM15Z1M
It seems that an ECM fixed the problem it was intermitantly dropping one injector driver. Trouble codes: 13 (o2 sensor short/bad), 33 (map sensor circuit high).
1999 Chevrolet Blazer 4.3L Encoder Motor VIN: 1GNCT18W6X
Tranny shop found bad bearings inside the transfer case and also found a bad wire I must have missed. Didn't really make sense on why it wouldn't still pop the fuse with the motor disconnected, but it's fixed now. Thanks to all that gave their time and info.
2003 Chevrolet Impala 3.4L Rocker arm bolt VIN: 2G1WF52E13
Thanks to all that replied. It seems most replies mention a valve sticking causing this problem. Others suggest that the mileage on the car is the culprit. One thing that is certain, it never bends a pushrod and the pushrods were installed properly. It turns o...
2007 Chevrolet Tahoe LTZ 5.3L radio/chime/window locks VIN: 1GNFK130X7
oh well this one is not a fix. I could not program this vehicle and I believe the radio was defective but without any kind of resources on a 2007 and no dealers around I couldnt help this customer. I would like to still fix it if anyone could offer any other i...
1995 GMC Jimmy SL 4.3L no start VIN: 1GKDT13W8S
I want to thank you all for your replies. It turns out the problem was with the distributor. Where the rotor mounts to the shaft has come lose, it was tight enough to turn and give spark but lose enough to move and throw timing off, I noticed it when I went to...
2000 GMC Jimmy Diamond Edition 4.3L Poor Idle Quality, Misfire VIN: 1GKDT13W7Y
Thank you to everyone who replied to this problem Jimmy. I'm glad to say that this vehicle is back on the road and running well. A few of you had mentioned that maybe the egr was stuck open with a piece of carbon. I failed to mention that I had already checked... Trouble codes: P0303 (Cylinder Misfire 3).
2001 GMC Jimmy SLE 4.3L turn signals and interior lighting VIN: 1GKDT13W81
Thanks for all the help it saved me a lot of time. It was a bad turnsignal switch that fixed the clicking turnsignal relay. I did not fix the interior lights staying on problem he just uses the interior ligtht over ride switch, because he did not want to spend...
1989 Pontiac Grand Prix SE 2.8L Excessive Emissions, Poor Idle Quality, MIL Lamp on VIN: 1G2WP14W1K
Thanks for the replies. But only one of you really helped me. I think that you people need to read the articles a little closer. My problem did not arive till I replaced the IAC. So what i came up with was The computer was not controlling the IAC. I had power ... Trouble codes: 33 (MAP voltage is high).
1991 Pontiac Grand Prix SE 3.1L Hesitation, Cuts out VIN: 1G2WJ54T8M
I got the car to dye out and not start and I removed the upper plenum and ohmed all my injectors and only one to be at the spec of 12.2 ohms the rest of them were ranging any wheres from 9 ohms to 1 ohm.At this point I replaced all 6 injectors and all is well,...
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