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Prev Professional Automotive Repair Technical Discussions for December 2, 2008
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Open Help Requests for GM
Help Request Answers
2003 Buick LeSabre Custom 3.8L Cuts out, Stall VIN: 1G4HP52K73
I have checked and rechecked components to and from the pcm. To include the Ignition switch. This car seems to just shut off periodically. It is like someone turned the key off. The power to the dash stays on though. Fires right back up with out turning off th...
1984 Chevrolet Corvette 5.7L battery VIN: 1G1AY0787E
hello everybody im here looking for help ihave done everything i can think of. i have a 1984 chevy corvette and the battery drains over night i have pull every fuse, relay, module, pcm and alternater wires and still has the draw. i pull the facture alarm out a...
1990 Chevrolet C1500 Cheyenne 5.7L Axle Seals VIN: 2GCEC14K4L
I cannot get these Axle Seals to stop leaking. I have tried every brand I can find. The Axle shafts are not worn, everything seems tight. Vent is open. I even used a smoke after installing the last set of seals. No smoke, flow meter went to zero. Also no noise...
1993 Chevrolet K1500 Cheyenne 4.3L Poor Idle Quality, Stall, MIL Lamp on VIN: 1GTEK14Z8P
O.K here's the skinny!! Truck came in to my buddies shop with a stalls at idle condition. Bring it off idle and all is well, but let it idle and it goes very rich and stalls. It will restart only if in clear flood mode. Here's the interesting part, with the MA...
1994 Chevrolet S10 4.3L fork VIN: 3456987654
Hi Guys! This one is making me crazy. It is my business truck, a 1994 chevy s-10 4x4 with 5 speed manual. I changed transmission (new venture 3500 pro rebuild) clutch, pressure plate, throwout bearing, pilot bearing, clutch fork, clutch master, and slave cyli...
1997 Chevrolet Venture 3.4L Timing cover VIN: 1GNDU06E2V
Hey techs. Heres something I haven't had to do before and had a question about it. There is this Chev Venture van with a 3.4L engine and the timing cover is leaking coolant. I even worked as a heavy line technician at a Chevrolet dealer for several years and n...
1998 Chevrolet C2500 Cheyenne 6.5L Poor Idle Quality, Surge VIN: 1GCFC29S1W
Truck idles poor sometimes, no codes, when you give truck a little bit of gas it just takes off and hits the governor. The key will turn the truck off everytime, so its not running away on oil or something else. Its defiantly a fueling problem I graphed the A...
1999 Chevrolet Malibu 3.1L security module VIN: 1G1ND52M8X
Typical GM security light flashing and no-start till light goes off. looking to bypass module. Previously worked at a GM dealer and we would temporarily bypass for movement till module could be replaced. Need to know how to permantely bypass the security modul...
2003 Chevrolet Trailblazer LS 4.2L Automatic Transfer Case VIN: IGNDT13S42
Thanks to all in advance for your time, I know it is valuable and scarce. Customer brought vehicle in, said it was "hopping" around corners like it was stuck in 4 wheel drive.(This is an Automatic Transfer Case vehicle with switch on dash 2wd/Auto/4hi/4lo)She ...
2006 Chevrolet HHR LS 2.2L MIL Lamp on VIN: 3GNDA13D06
Her only complaint is the check engine lite is on, and intermittenly will "lose power-steering assist". I drove it. Seems to run o.k.,shifts o.k., and steers like it should. Freeze frame on the P0700 showed a fairly cold start, (coolant temp was 127 and vehicl... Trouble codes: P0700 (transmission control fault), U0073 (bus line fault)
1999 GMC GMC6500 7.4L brake pedal won't return VIN: 1DGD6H1BOY
help.we got this gmc 6500 u haul truck sent to us,because the brake pedal wont return all the way and won't always release the brakes all the way.they are has 4 wheel disc brakes.someone else has replaced the p/s pump with a rebuilt.and we have cha...
2004 GMC Savana 2500 4.8L steering box (front end) VIN: 1GTGG25V04
Gentleman Ihave a 2004 Gmc Savanna 2500,it has a violent shake in the front end which only comes after usinrg the brakes repeatedly in a short distance,the first application of the brakes is fine but as the brakes are used the shake gets proggressivly worse,it...
2004 GMC C5500 Topkick C5C042 6.6L Misfire VIN: 1GDE5C1184
this truck has a duramax lb7 diesel engine in it i've used the tech 2 to find out that injector #4 is stuck in the open position and causing a bad knock in cyl #4. what i'm trying to find out is which cylinder is #4!!! i dont have the database that gives me an...
1995 Oldsmobile Aurora 4.0L Pressure Control VIN: 1G3GR62C7S
This car originally came in about 450 miles ago for a harsh engagement from park to reverse or drive. Had a code 76 PCS Circuit. Upon inspection then i found the internal harness leaking externally and a bad pcm. Pulled trans replaced harness and pcs (all oem)...
1986 Pontiac Fiero SE 2.8L Excessive Emissions, Hesitation, Surge, Cuts out VIN: 1G2PF3796G
hello this vehilce has been setting in the paint booth for about 18 months getting painted. about 2 week before the painter was scheduled to be done the customer appoached me and siad he would like a major tune-up with fuel induction. so made appt. and 2 weeks...
1996 Pontiac Sunfire SE 2.2L thermostat VIN: 3G2JB1243T
Hello fellow GM techs,I've just left the GM bench after 22yrs to work at local college. I replaced/students replaced cylinder head gasket with OEM gasket[was leaking externally].Bleed system,have good heat but student noticed radiator is cold at lower hose? Mo...
2001 Pontiac Grand Am SE 2.4L Starting VIN: 1G2NF52T71
Cranking no start, no compression,intermittant.About once or twice a week the engine will crank but have no compression on all cyl's(freewheeling sound,crank is turning).After a few attempts with a few minute delay the engine will start and run fine. This symp...
2001 Pontiac Montana 3.4L pass sliding door VIN: 1GMDX13E81
I am a Toyota dealer tech trying to fix my own Montana! Intermittently the passenger power sliding door won't stay latched. There was a recall for this but it has been done (recall no longer open according to vin). I am confident the problem is the release act...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac Eldorado 4.6L abs and trac VIN: 1G6EL12Y7V
James from RI hit it right on the head. Coolant had leaked into the ABS connector during engine replacement. Washed out the connector and applied a bit of dielectric and the problem is gone. Thanks once again.
1989 Chevrolet S10 2.5L No Start VIN: 1GTCS14A2M
Thanks for all the responses. I had failed to mention we had just replaced the fuel pump at the customers request and the pressure was good. The problem ended up being the PCM. The injector driver was failing causing the injector to not stay open long enough t...
1995 Chevrolet Corvette 5.7L No Start VIN: 1G1YY22P9S
well did not get any replies on this one but what i found should help someone in the future, there are 2 black 20 pin connectors and 2 white 8 pin connectors ok, both white connectors will plug into eachother and also both black also, had both plugged in wrong...
1995 Chevrolet Blazer 4.3L Cuts out VIN: 1GNDT13W2S
Thanks to all for your help alot of good advice. The was the injector pigtail replaced it and runs great. Mark
2001 Chevrolet Express 1500 4.3L transmission VIN: 1GNFGI5WX1
thanks to all for taking time to help me with this van we have replace the transmission and all is well,i really appreciate your help!darrel.
2003 Chevrolet Silverado 2500 HD 6.6L shift inhibit light VIN: 1GCHC29173
I replaced the prndl switch on the side of the trans with a "brown updated version" and that seemed to do the trick. Thanks to all of you who sent me info regarding this repair.
2003 Chevrolet Trailblazer LS 4.2L Cooling Systems VIN: 1GNDD13Z43
I received a wealth of information from all who took their valuable time to respond to my help request. Most said this problem was going to need flashing to resolve. I advised my customer/friend of this and he took it himself to the dealership to have flashe...
2004 GMC Savana 3500 6.0L Dash Cluster VIN: 1GDHG31U54
The "wacky" dash has been solved. Just to add to the mix the daytime running lights would also cycle on and off in corrospondents to the dash freak out. I had isolated all the data lines from all the modules to the splice pack 200 under dash and from there to ...
1988 Oldsmobile Cutlass Ciera 2.5L No Start, Poor Idle Quality VIN: 2G3AJ51R9J
Well I'm not as sharp as I thought.Darryll headed us in the proper direction. Turns out our snap-on scan tool (solus pro) can't read the data stream. Took out the trusty old otc scanner and all ecm inputs are right on. So back to basics. Thanks everyone for ta...
1992 Pontiac Grand Am SE 2.3L Timing Chain VIN: 1G2NE5436N
I think I have got this one fixed, time will tell. I found when I took it apart (the 3rd time!) that I could push the tensioner plunger in by hand. Closer examination revealed that the plunger was turned 90 degrees so the ratcheting mechanism couldn't work. Th...
1997 Saturn SL2 1.9L MIL Lamp on
advised customer to replace fuel pump assembly due to pressure not holding, koeo. released car and customer has not responded to additional repair and diagnosis. THANKS TO EVERYONE WHO RESPONDED! pretty sure it was the fuel pump assembly, usually the hose on t... Trouble codes: P0172.
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