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Prev Professional Automotive Repair Technical Discussions for January 16, 2009
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Open Help Requests for GM
Help Request Answers
1991 Buick Park Avenue 3.8L MIL Lamp on
Performed original repair timing set and cam magnet for cam sensor code, noted history code 26, first problem repaired. vehicle returned with no start were able to get running with ignition module and coil pack, while test driving to confirm repair noted ses l... Trouble codes: 26 (Quad Driver Module)
1990 Cadillac DeVille 4.5L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, Poor Fuel Economy VIN: 1G6CD1333L
Here is the story. Was running real rough and we changed the plugs thinking they were fouled but found that they were soaked with gas. We then plugged into the computer and found that the MAT was at -36 degrees and the CTS was at -34 degrees. After a few chec...
1991 Chevrolet Cavalier RS 2.2L shifting in cold weather VIN: 1G1JC14GXM
Well got down on my luck and previous tech I worked with gave me this car. Runs ok but when itscold you cant move shifter forward or backward with out beating it till it frees up. Have been thinking it was shifter cable but replacement is out for now as they a...
1995 Chevrolet Corsica 3.1L No Start, Misfire VIN: 1G1LD55M5S
Car was brought in hard to start. fuel pressure regulator was leaking, replaced it. Car started great. Came back next day. Hard to start and misfiring until idle got above 1100 rpm, the car would smooth out and stay running fine until it sat over night. The co...
1998 Chevrolet C1500 Suburban LS 5.7L Radiator VIN: 1GNEC16R8W
I have replaced the water pump, radiator,hoses,flushed system,this was done in June 07. I have since replaced the radiator in this suburban 4 times. They have been lasting about 6 months before they go to leaking. Has anyone run into this problem with radiator...
2000 Chevrolet K3500 5.7L Cuts out VIN: 1GCHK34R6Y
need some help. this is the third 2000 chev with a 5.7 gas engine that has been brought to me for this problem. the only common link is the problem started right after the fuel injector system was replaced. we did not do any repairs on these vehicles. the prob...
2000 Chevrolet Express 1500 5.0L power steering pump VIN: 1GBFG15R4Y
Van came in with no power steering. I found the belt and fluid in good condition. I found that the shaft was broken about 3 inches into the pump. Replaced the pump with a rebuilt napa unit with steering working perfectly. The next day I get a call that the ste...
2000 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GNEL19W6Y
came in with Random misfire code---found intake leaking coolant-worn distributor gear fixed the rough idle at all times-put in new injectors--misfire on cyls 2 and 3 found partially collapsed lifter on cyl 2-have check egr etc--do these have valve issues--I ha... Trouble codes: P0300 (random misfire)
2001 Chevrolet Suburban 1500 5.3L transfer case VIN: 1GNFK16TX1
Hello All; I'm looking for a GM 4WD tech here. I have this 01 Suburban that will not engage in 4WD when needed. It came in with no 4WD. I put it up on the hoist and did my testing. The encoder motor was not engaging the transfer case into four wheel drive. I ...
2006 Chevrolet Cobalt LS 2.2L MIL Lamp on, low power VIN: 1G1AK55FX6
This vehicle came in several weeks ago with several codes as well as reduced power message displayed on the instrument cluster. Brought vehicle in and test drove ran perfect but I pulled codes p1516,p2176,p2119,p2431. Cleared codes test drove codes didnt retur... Trouble codes: P1516, P2119, P2431, P2176
1994 GMC K1500 Sierra SL 5.0L Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 1GTEK14H4R
This truck is running rich. Map sensor when idling is 2.4 volts, should be below 2 volts. I've tried new Map sensor with no results, new ECM, nothing changes. I can manually put a vacuum on MAP sensor and bring down to 1.6 volts and truck runs great. I also re... Trouble codes: 33 (MAP high voltage)
2003 Oldsmobile Alero GL 3.4L No crank, radio VIN: 1G3NL52E03
Greetings. I have this alero in the shop. Came in on the hook for no start, no crank. Customer had vehicle running to warm up for a while yesterday morning (-15 degrees out), cranked and started fine. Shut off and went out about an hour later to go to work, no...
1998 Pontiac Sunfire GT 2.4L Theft Deterrent VIN: 1G2JD12T2W
Greetings fellow techs. I have a sunfire that is eating my lunch. It was brought to me after another shop got tired of messing with it. Theft light is on solid as long as key is on, and out as long as key is off. Car will not start at all. Never fires a lick. ...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Buick Regal LS 3.8L no crank VIN: 2G4WB52K94
after further testing we had a voltage drop coming from ignition switch. replaced switch, and all is well now. thanks again for all the replys.
2004 Cadillac SRX 4.6L Stall VIN: 1GYDE63A44
techs: want to thank all the guys that helped me repair this vehicle .ended up finding fault code for coolant sensor in generic. also throttle body was coked up !! tom ilinois,dean ny. allen sc.this caddy has been gone for a week . (like my old boss use to say...
1998 Chevrolet Malibu LS 3.1L high idle VIN: 1G1NE52M4W
Just want to thank Scott and Brett they were right on about the tps and harness. replaced tps and replaced tps connector and about 12in of harness. one thing though after I touched the battery cables together the fuel gauge needle spun all the way around. is t...
2004 Chevrolet Malibu Maxx LT 3.5L Factory Remote Start VIN: 1G1ZU648X4
We finally got this vehicle to fail in the shop. Set a hood ajar code (B3006). Checked hood switch, failed open, so jumped connector so BCM would see it always closed, remote start worked flawlessly. Replaced hood latch/switch assembly (available only throu...
2006 GMC Sierra 1500 WT 4.8L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on, sluggish VIN: 3GTEC14V76
After receiving the first post from Paul 3 min after I posted orig. problem, I thought that he was making alot of sense. I didn't know how the manifold was designed, sharing port vacuum that is. So the first thing the next morning, I checked pre & post bank 1 ... Trouble codes: P0131 (o2 sensor low B1S1), P0171 (System too lean B1S1), P0300 (Engine misfire detected).
1987 Oldsmobile Cutlass Ciera S 2.5L Cuts out, Stall VIN: 1G78MN3FRT
wow...the replies are awsome thnx...many of u nailed it... it was the injector... IATN ROCKS
2001 Oldsmobile Intrigue GLS 3.5L monitors not setting VIN: 1G3WX52H01
First let me thank those of you who have replied & apoligize for not closing this post earlier. We sent the car back to the GM dealer who replaced the computer. I went with one of my techs & showed the service advisor & his tech which solenoid was not being ... Trouble codes: P0410.
1998 Saturn SL1 1.9L Starting VIN: 1G8ZH5284W
we had engine rebuilder take a look at crank shaft and he informed us crank was shot,customer declined fix due to age of car,thanks for advice ,learned alot and customer learned the hard way,thanks again guys
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