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Prev Professional Automotive Repair Technical Discussions for July 1, 2005
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1997 Buick LeSabre Custom 3.8L spedo VIN: IG4HP52KOV
Spedo seems to be reading about twice as fast as you are really going,when you are doing 20 mph its reading 40 mph on the dash. I replaved the vehicle speed sensor,no change. The guages and spedo are not digital.
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1997 Cadillac Catera 3.0L lifters VIN: W06VR52R8O
vehicle was at another shop they gave up. Appears to have noisy lifter on rt side. They got replaced,at 50.00 each, same noise.Vehicle has 80 psi cold, 40 psi hot. Noise is defently coming from under valve cover sounds like old chrysler 6 cylinder. Have timin...
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2001 Cadillac DeVille DTS 4.6L Mode Actuator & Doors VIN: 1G6KF57991
Checked codes and data, data shows command and actual readings are not matched for a/c / defrost mode door and air inlet door. Located faulty a/c / defrost mode door actuator but I am unable to get the new one working properly. I know I am having a hard time b...
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1989 Chevrolet Blazer Silverado 5.7L Poor Idle Quality, Stall, Leans out at idle VIN: 1GNEV18K5K
The only way to keep the engine idling is to diconnect the timing advance connector or select backup fuel/spark with the mastertech scanner. The engine is leaning out at about 1500 rpm just before it stalls. The timing maks advance normally when the timing is ...
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1997 Chevrolet C2500 Cheyenne 6.5L drive line VIN: 1GCGC24F6V
Diesel techs, help! We have a truck that is used for going out in the county and picks up stray animals. This truck pulls a goose neck trailer. It jerks when you gain speed and won't upshift from second until you reach about 45 to 50 mph. The transmission has ...
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1999 Chevrolet Tahoe LS 5.7L shifter VIN: 1GNEK13R4X
We have several customers with the same problem. The shifter lever on the column is very hard to move. It is happening in all Chevrolet/GMC trucks and SUV's. If anyone has seen this let me know. I have unhooked the cable and the column and the lever moves free...
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2000 Chevrolet Silverado 1500 4.3L engine VIN: 1GCEC14WOY
truck came in with no compression on cyl 1 & 6.Found camshaft worn out -Customer opted for new engine. we installed rebuilt engine and started right up, but still misfire on # 6 and sometimes # 1. Checked dist to cam timing and found to be +34 degrees. pulled ...
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1992 GMC K1500 Sierra 5.7L Hesitation, Misfire VIN: 1GTEK14K3N
this is probably an easy one for you chevy guys this truck stumbles on light acceleration when the egr valve opens if the vacuum is disconnected from the valve it runs great the read out on the scan tool indicates the valve is doing what it is supose to but it...
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1995 GMC K2500 Sierra SL 5.7L tps sensor VIN: 1GTFK24K7S
Can someone tell me what the tps sensor voltage is suppose to be. I am have tranny problems and I believe this is keeping the pressure too low. Len.
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1993 Oldsmobile Silhouette 3.8L hi. idle VIN: 1GHDU06L3P
I have a ramdom high idle of about 1600 to 1800 rpm's. if you cycle the key off at times it will have a normal idle.I can control the idle with the master tech as long as the idle is normal on startup,it will idle down an up,but if it starts with a high idle i...
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1999 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NW12E3X
Customer was cruising down the interstate at 90 mph. Backed off the throttle to hit the off ramp. As he touched the brakes and turned the wheel he noticed both were not working. At that point he discovered the engine had shut off. Would crank over, but not sta...
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Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Regal LS 3.8L MIL Lamp on VIN: 2G4WB55K41
thank you for all your help. I presented the information to the customer and he has decided not to do the repair. i am sure you guys were right on target. thank you again for your help. Trouble codes: P0420.
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1995 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W1S
Thank you all who responded to my request, I receieved alot of great suggestions. I pulled the upper plenium off just to see if there were any restrictions- none. Pulled the egr valve back off and used scan tool to activate pintle, worked great. Next I took a ... Trouble codes: P0401.
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1995 Chevrolet S10 4.3L clutch VIN: IGCDT19Z2S
Well I finally got this one fixed. I had many replies on this one. The replies were split between the clutch being bad, master or slave problem, and clutch fork bent. I removed transmission and found clutch worn out, and the clutch fork bent. Replaced clutch, ...
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1996 Chevrolet Camaro 3.8L compressor not ingauged VIN: 2G1FP22K3T
Got'er cool'in as stated compressor would werk with scan tool had checked and no voltage to clutch all utter parts of the system in werk'in order. It's a simple system no fancy controls I never could find a evaporator temp sensor (ETS). Went to the local Chevy...
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1997 Chevrolet Lumina 3.1L Poor Idle Quality, Cuts out VIN: 2G1WL52MXV
Sorry i meant to get back to this one sooner but we've been busy. I tested the MAF ckt and voltage and it turned out fine, i checked the exhaust and egr systems and realized how lame i am. Craig nailed it w/ the big vacuum leak, I ended up replacing the valve ...
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1998 Chevrolet Venture 3.4L Excessive Emissions, Poor Idle Quality, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 16NDX03E8W
It was the oxygen sensor. Thanks for everyone's input. The upstream sensor was replaced and the roughness cleared up. Have a great day! Trouble codes: 171 (lean bank 1 exhaust).
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2004 Chevrolet Silverado 2500 HD 6.6L steering effort VIN: 1GCHK23274
HI EVERYONE ! WE GOT IT FIGURED OUT .SOME OF YOU GOT US THINKING ABOUT THOSE TIRES. THEY ARE OVERSIZE AND OFFSET WHICH THREW THE SCRUB RADIUS OUT OF SPEC AND WORN OUT TIRES WITH NO TREAD TO PROVIDE SOME GIVE ONLY MULTIPLIED THE PROBLEM. NEW TIRES GREATLY REDUC...
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1989 Oldsmobile Cutlass Calais 2.5L Excessive Emissions, Cuts out, Stall VIN: 1G3NL54U7K
sorry guys i enter the wrong vechicle info iwill start over when i get i little more time thank you again for ypur time Trouble codes: 45 (rich exhaust).
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1997 Oldsmobile Achieva S 3.1L anti theft syst. VIN: 1G3NL52M1V
Hello all: I received three useful replies which I put into practice. I reset ECM codes and did the ten minute wait time to have system relearn new cylinder lock sensor code. Did not work. My modis scanner does not read the body control module on this vehicle ...
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1998 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB124XW
Thanks for all the replies for my friend. He pulled the valve cover and no 1 plug and checked timming that way. It cheecked out at that time so he went on else where. When nothing paned out he contacted me. Like Roger from Alberta said it is too good to be tru...
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2000 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NF52T8Y
Thanks for all of your help. As we suspected, it was the ignition switch. It was nice to get all of your second opinions before spending the customer's money. We thought that this car was too new to have ignittion switch problems, but apparently a number of yo...
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2000 Pontiac Grand Prix GT 3.8L overheating VIN: 1G2WP52K9Y
Replaced radiator, Thanks for all the help. After I replace the radiator, I cut it open and the deposits had almost completely filled the cores.
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2001 Pontiac Montana 3.4L Rear VIN: 1GMDX03E21
_____________________ ORIGINAL MESSAGE _____________________ Front air works great cools to 38F rear blows 80F. The blend air door is moving rear evaperator is not getting cold. lines at rear are the same temp. I think it is a rear expantion vale but our GM ...
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