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Prev Professional Automotive Repair Technical Discussions for May 30, 2006
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Open Help Requests for GM
Help Request Answers
1993 Buick LeSabre Custom 3.8L Master Cyl, ABS Controll VIN: 1G4HR5310N
This one has me stumped. We have replaced the brake system from front to rear basically, Its a high milage car but the customer loves it. We replaced the booster and master cylinder, It left the shop every thing was fine good pedal and good brakes. He came bac...
1997 Buick Regal GS 3.8L e.g. fuel gauge, electric window, door locks, VIN: 2G4WF5210V
when i use turn sig right and left it shuts car off ! flashers work fine! you can hear fuel pump cycl, ipc shuts down,etc pcm shuts down etc.pulled all bulbs no help! pulled bcm no help! then car will not start until you wait for some time. you can see service...
1999 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY5499X
camsenser code comes on right after startup. tryed a new senser (didnt help) I have a square wave out of ICM and the same at PCM . could I have the timing change of a tooth and the PCM cam see the camsenser but its not at the correct time so it sets the code. ... Trouble codes: P0340
1988 Chevrolet Corsica 2.0L No Start VIN: 1G1LT5111J
When I tested the vehicle, we were getting a weak ground pulse to injector (TBI). Tested wave form for crank imput to computer from Ignition Control Module. Wave form o.k. Ran flow chart which led me to touching hot to ECM imput through test light. Still weak ...
1992 Chevrolet K2500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Surge, Stall, Misfire, Poor Fuel Economy VIN: 2GCGK29K4N
Most TBI pumps in this era produce 15 psi deadhead in my experience. My pump has 22 psi. Seems a little high to me. I don't use aftermarket pumps if possible and am not familiar with their characteristics. Other shop installed pump, so I am in the dark here. P...
1995 Chevrolet Blazer 4.3L Poor Idle Quality, MIL Lamp on VIN: 1GNDT13W6S
This vehicle is not firing on 1,3, and 5 cylinders at idle, I can pull those wires off and absolutely no difference. I put a cap and rotor on it just to be sure (got burned once by not doing it) and ran the same. Plugs for those cylinders indicate rich. Vacuum... Trouble codes: P1406
1996 Chevrolet Blazer 4.3L no 1-2 shift VIN: 1GNDT13WXT
hello fellow techs. trans had no other issues until we "fixed" it! vehicle now holds in first gear till about 3500 rpm and then goes straight to third gear. tech 2 indicates that second gear is commanded (even though it is clearly in first). in manual second, ...
1999 Chevrolet C3500 7.4L Misfire VIN: 1GCHC33J3X
Allright guys this truck has me puzzled. came in with a bad misfire on number 8. I did a full tune up including the plugs, wires, cap and rotor, and fuel injection flush. the plugs that the vehicle had were champion plugs and were fuel fouled really bad. Anywa...
1999 Chevrolet Tahoe LS 5.7L starting VIN: 1GNEC13R6X
customer originally brought car to us as a no start...we towed car in and could not replicate complaint of no took three incidents before we could catch vehicle in no start condition. we used snap on scanner to see that it was consistently setting t...
2000 Chevrolet Suburban 1500 LT 5.3L ac pressure VIN: 3GNFK16T8Y
truck came in with major ac compressor lock up, replaced ac compressor, condensor, new reciever dryer, low side line to rear unit, and redesigned line from dryer to compressor. new low and high pressure switches. flushed all remaining lines, front and rear ev...
2001 Chevrolet Blazer LS 4.3L 4wd VIN: 1GNDT13WX1
We have found that the four wheel drive module may have been wet a one time. found a used unit, and installed. now we can change modes thru scan tool, but not from dash switches. dash switches seem to be in specs when pin tested at module. what are we missing?
2001 Chevrolet Blazer LS 4.3L MIL Lamp on, Code P0410 VIN: 1GNCT18W51
Hi, please help...01 S10 Blazer with California emissions, MIL light on, replaced secondary air pump w/updated hoses & solenoid (pump was siezed up), reset PCM, MIL light comes back on within 5 days with same code P0410.Tried to run secondary air pump thru sca... Trouble codes: P0410 (Secondary Air Injection System)
2001 Chevrolet Metro LSi 1.3L No Start VIN: 2C1MR522X1
hey everyone, got one that should sounds simple but, not!! it cranks won't start, good spark, inj pulse, fuel pressure compression, no the cam sprocket did not move. however!! when i shoot carb cleaner in the throttle body, it starts and runs great, i ck-ed ts...
2002 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNCT18W42
maf tps map readings @signal wire at pcm are the same as above but readings on scan tool are zero all the time i have 5v ref ground at all sensors all sensors ohm out o.k. Trouble codes: P0101, P0155, P0300
1999 Oldsmobile Alero GL 2.4L dome light and door locks VIN: 1G3NL52T5X
Hello all, thanks in advance for taking the time to read my post. We had this vehicle sent to us from a body shop d/s door was replaced. C/S that since vehicle was repaired door locks and dome light cycles while driving. When you torque the engine in drive and...
1997 Pontiac Trans Sport 3.4L Power windows/front blower VIN: 1GMDXO3EIV
I have power coming out of the underhood fuse panel in a red wire going through the firewall and up high in the dash above the glove box. I have an orange wire coming from the same location that feeds the I/P circuit breaker and is suppose to be HOT IN RUN but...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y11
I have not got this car back into the shop yet but when it does come back i am going to replace both crank sensors and do a crank shaft sensor relearn like all of you stated and as soon as i can i will let all know if it fixes it thanks to all that replied tha... Trouble codes: P0386.
1990 Chevrolet R1500 Suburban Silverado 5.7L fuel guage VIN: 1GNER16K2L
Well its fixed after replacing the instrument cluster the fuel guage is accurate .I am thankful for all the replies that I recieved you guys really helped me by verifing that I was on the right track of finding the problem without throwing parts on. .
1999 Chevrolet Silverado 1500 5.3L starting VIN: 1GCEC14T7X
i would like to thank all the technicians who responded to my help request they were all helpful in regards to this truck we were told that customer may have jumped fuel pump relay in order to get truck running after checking theft system and replacing key and...
2003 GMC Yukon XL 1500 SLE 5.3L Steering VIN: 1GNFK16Z53
Truck finally came back in for alignment. Jason made adjustments and got the caster more even on both sides. We checked the gear box as well and found no symptoms. Customer has not returned or notified us they have experienced the pull. We have re emphasized a...
1992 Oldsmobile 88 Royale 3.8L Surge, MIL Lamp on, Spark Knock VIN: 1G3HN53L7N
Thank You for the help from you guys. This car does not have an EGR valve. I cleaned the upper intake, tried 3 TP sensors, plugs and wires, new PCV valve. Still have problem, but now I think the problem is in the ECU. Trouble codes: 21 (TPS low voltage), 22 (TPS high voltage).
1995 Oldsmobile Aurora 4.0L No Start
well alot of head scratching, alldata, mitchell, and many hours of testing, have come up empty. everything is within spects. cam,and crank is the only think i have found to be at the low end of spects. but still is within range. the customer came in a picked u...
1998 Oldsmobile Regency 3.8L Stall, MIL Lamp on VIN: 1GC52K6W48
I have scoped out the crank sensor many times, with no problems. This problem is very intermintent. I could not duplicate stalling, it just stalls when it wants. Recommend crank sensor to customer. He wanted it replaced. That beed over a week ago with no probl... Trouble codes: P0327 (Knock sensor bank 1), P0332 (Knock sensor bank 2), P0336 (Crankshaft position sensor performance).
2001 Pontiac Sunfire SE 2.2L front end VIN: 1G2NE52T8X
Hey guy's i just wanted to say thank you all for your help! I looked real hard and found a broken bolt on the upper motor mount to the frame i can't beleive we all overlooked this so i replaced bolt and mount cause it was obveisly bent from the impacked of the...
2002 Saturn L200 2.2L Temperature Gauge VIN: 1G8JU54F52
Recieved a lot of emails about the coolant sensor cracking. This is true with the the 1.9 liter engines. Not the 2.2 l. engines, like the one working on. Cody from TX. said they saw a lot of bad BCM's. Customer did not want to spend that much money to have the...
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