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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 28, 2008
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Open Help Requests for GM
Help Request Answers
1993 Buick Roadmaster 5.7L Brake pedal VIN: 1G4BR8779P
Vehicle was towed to the shop with the brake line rusted through and leaking. We replaced all the lines along with a reman booster and master cylinder, ABS module,and rear wheel cylinders. The brake fluid comes out of all four bleeders with good pressure when ...
2003 Cadillac DeVille 4.6L engine VIN: 1G6KD54Y13
this car started burning oil about 6000 miles ago. at least that is when it was brought to our attention. the car is using at leat 1 qt per 1000 miles. once it used 3 qts in about 1500 miles. there is no signs of external leaks and the pcv system is clean with...
1993 Chevrolet Lumina 3.1L Poor Idle Quality, Hesitation, Surge, Stall, Misfire VIN: 2G1WN51T3P
when checking data stream voltages are all out of soec also shows vecile speed at idle in park i was thinking it had bad ecm or bad ground check all and still have same problem please help fellow techs Trouble codes: 34 (map sensor circut), 42 (est circut), 35 (iac circut)
2000 Chevrolet Silverado 1500 5.3L fuel gauge/odometer/message center/cruise control VIN: 2GCEC19T7Y
inop. fuel gauge,odometer,message center, tech assumed cluster failure. replaced with o.e.m. reman. same problem, checked further & found cruise control fuse blown. replaced fuse & everything worked fine.test drove using cruise fuse did not blow.released to cu...
2002 Chevrolet Monte Carlo LS 3.4L No Start VIN: 2G1WW12E12
Car will not start with key, Code P1626 will not clear and no communication with BCM at all. Checked connections at BCM, ignition switch and PCM. Have battery power at start relay but no ground from PCM. I can ground start relay and car will run for a few seco... Trouble codes: P1626 (Anti-theft system Fuel enable circuit)
2002 Chevrolet Suburban 1500 LT 5.3L Dome light VIN: 1GNFK16ZX2
I have stumper here. Customer complaint of no DRLS. Our inspection found a bad BCM. The BCM was replaced with a GM unit and programed by the dealer. All was well for a couple of days, now the customer says the dome lights stopped working. We diagnosed the vehi...
2002 Chevrolet Silverado 1500 4.3L Poor Idle Quality, Stall, Misfire VIN: 2GCEC19W82
This was towed to us from another shop ( my Favorite ) with a no start . Other shop said plugs were gas fouled. They replaced plugs & pulled dist to Clean (?), still no start & kicks back like out of time. We checked & dist was out by 1 tooth & they had broke ... Trouble codes: 300 (Random Missfire)
2004 Chevrolet Avalanche 1500 Z66 5.3L Hesitation, Surge, Cuts out VIN: 3GNEK12T74
This truck came in on the tow truck,customer had filled tank w/gas ran 3 miles and truck cut off. He thought he had water in his gas. My test found the fuel pressure would drop (KOEO)FROM 60 TO 0 PSI. Pulled the fuel tank and found the plastic hose had a hole ...
2001 GMC Sierra 2500 HD SL 6.6L Cuts out, MIL Lamp on VIN: 1GTHK29171
This truck has bounced from shop to shop. GM dealers will not help customer so he came to me. It will go into limp mode under acceleration when it shifts into higher gears. I have watched actual and requested fuel rail pressure with my OTC Genysis. I don't see... Trouble codes: P0093
2002 GMC Yukon XL 1500 SLE 5.3L oil pressure gauge VIN: 3GKFK16Z02
customer is complaining that his oil pressure gauge reads pressure when he turns the car off, all other gauges go to 0. when he turns the ignition from off to run the gauge goes to 0 but if he turns it off again the pressure goes up. we verified that the gauge...
2000 Pontiac Grand Prix SE 3.1L Hesitation, MIL Lamp on VIN: 1G2WJ52J4Y
This car, Original complaint was that check eng lite and trac light were on. I drove the vehicle and found that the car was surging and that the tachometer would drop to 0 then back up again. I replaced both crank sensors, did CKP relearn a couple of times and... Trouble codes: P0336 (24X reference signal lost)
2003 Saturn Vue 3.0L Misfire, MIL Lamp on VIN: 5GZCZ63B83
Vehicle was towed to me because check engine light was flashing. Scanned computer and found misfire codes for 1, 3, and 5. All of these are on the same bank. Vehicle has over 100,000 miles and has had no maintenance work to it. I removed the Intake and changed... Trouble codes: P0300, P0301 (1 Cylinder Miss), P0303 (3 Cylinder Miss), P0305 (5 Cylinder Miss)

Fixes & Summaries for GM
Fix/Summary Answers
2002 Cadillac DeVille DHS 4.6L Misfire VIN: 1G6KE57Y12
David [...] had the correct solution for this problem; perform decarboning with top clean. I used BG 44K and let soak overnight and the next morning, ran the guts out of it. After the 3rd passing gear full throttle, this thing came to life and misfire counte... Trouble codes: P0300 (Random Missfire).
1984 Chevrolet Corvette 5.7L brakes locked up
thanks everyone. I sucked out the fluid out of the master cylinder and could see the debree from the hoses. I replaced the master cylinder and and blew out the brake lines with shop air. All kinds of trash came out of the lines. Filled up the master cylind...
1995 Chevrolet Blazer 4.3L extended crank/start VIN: 1GNDT13WXS
this vehicle had no visible drips or leaks when we removed upper plenum. fuel pressure held steady but after 5 minutes it dropped to 45 psi with the key off. this was the first time the fuel pressure dropped.i went ahead and replaced the injector spider assemb...
2001 Chevrolet Cab & Chassis Silverado 3500 6.0L Fuel pump operation VIN: 1GBJK34U51
Thanks for the help. After working on the new style system its not that complicated. Just not used to not having a frame mounted pump or a switch in the cab to switch tanks. But anyway we replaced the relay and everything is working fine. Thanks again.
2001 Chevrolet Malibu 3.1L Poor Idle Quality VIN: 1G1ND52141
This one I'm not really sure about-I never did get to experience the "stuck throttle" after customer left car with me. I drove the car literally 100 miles over a 5 day period. Customer was very understanding and decided to replace iac for good measure.It has b...
2002 Chevrolet Trailblazer LS 4.2L Ipc/Radio VIN: 1GNDS13S72
The draw was caused by ceartain modules not being powered down, the culprit was the lift gate module, if i pulled the power feed wire from it the other modules powered down after 30 seconds or so. The fix was replacing the lift gate module, as for why the lif...
2004 Chevrolet Silverado 1500 LS 5.3L ipc odometer VIN: 2GCEK13T54
Thanks to everyone that replied. You need to either have tis web to program this or send the vehicle to the dealer. Since I couldn't get a return phone call from my local gm dealer's service advisor to schedule a time to come in, I called back the parts dept...
2000 Pontiac Grand Prix GT 3.8L headrest VIN: 1G2WP12K0Y
Thanks to the 4 replies who put me on the right track, all were correct. Pushing the plastic retainer on the seat portion and removing the head rest rods and all is how it comes out. The retaining clip on the rod closest to the door proved to be a bit of a s...
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