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Prev Professional Automotive Repair Technical Discussions for November 20, 2009
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Open Help Requests for GM
Help Request Answers
1994 Buick Park Avenue 3.8L Cuts out, MIL Lamp on VIN: 1G4CW32L6R
I teach high school auto shop. this car belongs to another teacher. Has stalling problems on decel. My students and I have tried 3 different scanners and all state NO COMMUNCIATION for any of the systems (pcm, trans, abs, etc) (snapon solus, mt2500 and Genisis...
1995 Chevrolet K1500 Silverado 5.7L Hesitation, Cuts out VIN: 2GTEK19K3S
this truck runs fine when idling hot or cold but when put in gear it falls flat on it's face we have checked everything in fuel system and the ingnition system and all checks out as great anyone ever run into this problem before or have any ideas as to what el...
1995 Chevrolet Lumina 3.1L tcc VIN: 2G1WL52M2S
Please help. This transmission shifts fine except for tcc. At highway speeds if you are coasting if will go into 4th gear but as soon as you touch the throttle it downshifts to 3rd. Scanner shows it on and off. Have disconnected the wire to engage tcc and stil...
1999 Chevrolet Tahoe 5.7L Steering VIN: 1GNEK13R3X
I have a 1999 Chevy Tahoe that has the "Death Wobble". Around 45 mph after hitting a bump. The vehicle steering wheel shakes so bad, you have to pull over to regain control of the truck. I've checked the whole steering/suspension. I found very small play in th...
2001 Chevrolet Silverado 2500 HD 6.0L No Start VIN: 1GCHK24U04
Thanks for any help I can get. This truck came in on the hook with a no start. Customer stated that all gauges except tach quit working and all warning lights on cluster came on. When truck was turned off it would not restart. I attemped to scan with Tech 2 bu...
2003 Chevrolet Tahoe LS 4.8L Electronic VIN: 1GNEK13V03
Truck came in with a bad slippery transmission, install complete reman from the dealer a week later customer came back & his complian is the 4WD light is on & the front axels are engaging on & off & feels that when he's turning, & he insist he never had that i...
2004 Chevrolet Silverado 2500 HD 6.0L monitor will not se, VIN: 1GCHK29U64
thanks to all in advance. This one has been giving me a hard time for 3 days. Vehical came in with po442 code and po455 code, smoked system three times and no leaks found.Changed gas cap and vent solenoid, still no monitor set and tighten gas cap will display ...
2004 Chevrolet Colorado Sport 3.5L No Start, Stall VIN: 1GCCS19684
Customers complaint was engine dies intermittently dies at stops, start and immediatly die, no crank, check engine light on, power reduction message. Scanned and found multiple codes CO899, V1064,PO601A, PO601. Suspect bad PCM, archives have simalar fix with n... Trouble codes: C0899, V1064 (Communication Loss with BCM), P601, P0601
2005 Chevrolet Silverado 1500 LS 5.3L Poor Idle Quality, MIL Lamp on VIN: 1GCEK19B95
ok guys this one is driving me crazy 2005 silverado w/5.3l. vehicle came in with complaint of running rough when cold. scanned vehicle and found misfires on #3 and 4 cylinders. checked compression on every cylinder and found 160lbs on all. checked for injecto... Trouble codes: P0300
2006 Chevrolet Uplander LS 3.5L headlights VIN: 1GNDV23126
Hi guys, This uplander here came in with a complaint of "headlights going dim". Checked out and found battery voltage fluctuates from aroud 13V-14.5V. Unplug signal wires going to alternator, Voltage stabilizes, but obviously stops charging. We replaced altern...
1994 Geo Prizm LSi 1.8L MIL Lamp on VIN: 1Y1SK5385R
This vehicle is in for a check engine light and knock sensor code. That is the only code. Customer installed a knock sensor (dealer part) and brought it to me because it did not fix it. The mil is random and inconsistant. My question is... I unplug the wire to...
2000 GMC Sierra 1500 SLE 5.3L power to truck VIN: 2GTEK19T6Y
thanks for any help that i may get on this! intermitenly when the truck is off and you go to start it the second the key hit the start posission on the ignition all the power in the truck goes out /no power to any thing. after this accures if you disconect th...
2004 GMC Yukon Denali XL 6.0L poping noise VIN: 1GKFK66U24
This Denali is kicking our butts. The engine runs great, no drivability concern, no codes in any system, Truck really runs great. However, after its warm and cruising or just driving normal there is a poping noise coming from front (as far as we can tell) it s...
2003 Saturn Ion-1 2.2L blower motor VIN: 1G8AF52F03
I dont have any power at the blower motor unless i put it on high there is no power to the resistor on any speed . there is alot of posts about burnt wires and such but i looked everywhere on all connectors and i see no burnt anything . has one seen a bad bcm ...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Century Custom 3.1L abs VIN: 2G4WS52JX2
Ah yes, just a little more patience on this one without a rush to judgement. I instructed the tech to tear apart the harness and [...] and behold- a compromised wire about 5 inches from the H&B assembly. What is strange, is that yesterday we load tested the wire...
1994 Chevrolet C3500 Cheyenne 7.4L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1GCGC34M9R
Installed a stage 1 Jet Performance prom and the truck runs and accelerates great! I was a bit concerned because it is a piggyback style and was afraid the wrong prom was going to effect it but it doesn't. Runs clean enough to pass our State's asm emission tes...
2004 Chevrolet Silverado 1500 LT 5.3L mode door actuator VIN: 2GCEC13TX4
As an instructor I should be more observant of my students information. When he told me he only had two of the three bolts in the actuator I assumed it was installed in the vehicle. The problem is when it runs self calibration it goes over the limit and locks ...
2005 Chevrolet Express 3500 6.0L spark VIN: 1GBJG31U95
thanks to everyone we finally seen the truck agian.the problem was the ignition switch!we also checked the wire over the fender well it was not broken yet but it would have if it wasn,t for all the great replies!once agian iatn saves the day hope to help out s...
1991 GMC S15 Jimmy SLE 4.3L clutch fork VIN: 1GKCT18Z2M
Thanks for your help. I replaced the flywheel and clutch fork. The flywheel had been resurfaced, (too thin) and the clutch fork had small cracks at the pivoit point and some wear at the contact area of the throw out bearing. I could not get much info from the ...
2001 Pontiac Aztek 3.4L Information display VIN: 3G7DA03E01
Took car to dealer for second opinion to show the customer we are not hiding anything and the battery replacment was not cause. The dealer diagnosed BCM failure (voltage problem to alternator). BCM requires replacment but customer declined repair and still...
2001 Pontiac Grand Am GT 3.4L Hesitation, Surge, Cuts out VIN: 1G2NW52E21
Thanks for all the info from everyone. Found out balancer was replaced a month ago and car was not driven much. I even replaced the balancer because it looked like a new part, and i thought that it might have been the problem. But I replaced it with a Dorma...
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