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Prev Professional Automotive Repair Technical Discussions for October 24, 2007
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Open Help Requests for GM
Help Request Answers
1996 Buick Skylark Custom 3.1L instrument cluster VIN: 1G4NJ52M7T
I have a dash cluster that turns on all of the warning lights and disabels the coolant guage after the vehicle as been running for about [...].We have replaced the cluster,checked power&grounds with a meter.Scan tool shows that the ecu has not requested the...
1997 Buick LeSabre Limited 3.8L Stall VIN: 1G4HR52K4V
after it starts, runs good for about 5 min, then turn off like turning the key off. will restart run ok. don"t seen to lose no power fuel system or ign system. dont loose power or ground at the computer or sensors.replace crank & cam sensor.replace module with...
2003 Buick Rendezvous CX 3.4L MIL Lamp on VIN: 3G5DA03E43
Sorry in advance for long post. Got this cam code, scanner showing no cam signal. I hooked up lab scope to verify and show no signal on terminal b brown/white wire. Should have 12 volts square wave. I checked terminal a red wire it has 12 volts and the remaini... Trouble codes: P0340 (cam sensor)
1990 Cadillac Seville 4.5L passkey VIN: 1G6KS536LU
Passkey module is bad and customer doesn't want to spend $200+ on a new module. I want to know how to bypass module to get fuel injectors to fire. I can ground the black-yellow wire to the starter enable relay to get the starter to crank. I'm not sure what to ...
2000 Cadillac Eldorado ETC 4.6L 1-2 shift VIN: 1G6ET1299Y
replaced orig. trans with used unit. code came with used unit. preformed tsb.#-1-07-30-009b no help. i,m not a trans tech. any help would help. joe fannin
1996 Chevrolet C2500 Cheyenne 6.5L No Start, Cuts out, Stall VIN: 1GCGC29F6T
Thanks for the help Diesel Techs. This truck runs fine but on occasion it does not start ans sometimes it dies while running. There is no rhyme or reason to it. Sometimes it is hot and others it is cold. I have no codes in the computer. The lift pump is runnin...
1997 Chevrolet Astro 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDM19W7V
hello everyone i have this astro van with a problem. ive knocking my brain for a couple weeks. van came in running bad and a melted cat converter.i replaced cat converter and rechecked engine. i connected scanner and data stream readings were all over varing u...
1998 Chevrolet S10 2.2L Stall VIN: 1GCCS1444W
This vehicle came in running with #2 cylinder misfire. After diagnosing the vehicle we replaced the ECM with a used unit. Now it starts and runs on all 4 cylinders but only for about 6 seconds. We have tried the reprogramming protocol several times. We replace... Trouble codes: U1016 (loss of class two communication), P1629 (no fuel enable signal)
1998 Chevrolet Corvette 5.7L ABS module VIN: 1G1YY32G5W
The cars ABS and Traction control lights are on. Scanned vehicle and has code C1255. (EBCM/EBTCM internal malfunction) Unable to clear code. According to Mitchells diagnostic trouble tree if you clear code turn off ignition & disconnect DLC, turn vehicle on an...
1998 Chevrolet S10 LS 2.2L MIL Lamp on VIN: 1GCCS1942W
Please help me with this truck ... it won't go away. I have changed everything that has to do with the EGR codes. 1st time in P0405 code stored ... changed the valve - customer came back a week later - light back on... now a P0404 stored? Have changed the EGR ... Trouble codes: P0404 (egr valve pintle position open), P0405 (egr valve sensor signal low)
2000 Chevrolet Blazer LS 4.3L 3-od VIN: 1GNCT18W5Y
Linkage is fine all other functions are fine. I am not a transmission shop or very well equiped for them. We do mostly electrical and suspension. Any help would be appreciated. [...] Andy
2001 Chevrolet Silverado 2500 HD 6.0L Cuts out, Stall VIN: 1GCHK24G01
This truck has been a problem for the customer for a month, it might stall on the highway driving at any speed, pull over to the side , put it in park and it will start up instanly. Customer has and extended warranty so he took it back to the dealer twice, the...
2004 Chevrolet C5500 Kodiak C5C042 6.6L No Start, Stall VIN: 1GBJ5C1154
This truck will stall intermittently and not start intermittently. Customer stated once it would not start in the morning. If it stalls on the road he lets it sit for awhile and then it starts back up. This has happed to him before and after he tried a new cra... Trouble codes: P0236, P0335
2006 Chevrolet Uplander LS 3.5L LU Shift VIN: 1GNOV23L16
This is a cab so it gets used hard. Road tested with scanner on and it is getting commanded to go in and out of lock up very quickly. makes the car feel like it is suging going down the road. Eveything on the scanner looks ok except you can see the command on ...
1997 GMC K1500 Sierra SL 5.7L Misfire, MIL Lamp on VIN: 2GTEK19RXV
I have a random miss fire code p0300 . cheaked miss fire data cyl # 3 miss firing with a miss on cyl# 6 thats sporatic . tune up was done .Truck was looked at by A GM dealer fuel injetors where then replaced . compresion cheak done and valve train on cyl 3 was... Trouble codes: P0300
2002 GMC Sonoma SL 2.2L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GTCS14582
We replaced the head gasket recently. After firing it up it ran fine for 2 days and then started missing. Found an injector harness plug not fully seated. Good to go. Came back 1 week later with P0171- system too lean bank 1 code set and idle so high that owne... Trouble codes: P0171 (system too lean), P0507 (idle speed too high)
1994 Pontiac Sunbird LE 2.0L No Start VIN: 1G2JB5H8R7
hi guys! this came in no crank, alarm was deactivating starter. toggle vale sw. car cranks now. cust put on starter at home, and still no start, alarm deal. so now it will crank but it floods 1 sec after it trys to fire. pulse width is way hi, 40.00 to 35.2 ms...
2000 Pontiac Grand Prix GTP 3.8L Misfire VIN: 1G2WR5219Y
misfire at 55-60mph,cyls drop #2#3#5 only under load,cannot do in shop must drive,traction lite on,& cannot turn off?any help,wiring looks ok,thanks, randy [...] Trouble codes: C0244 (traction control/anti lock brakes), P1381 (misfire detected), P1571 (traction control torque request circuit)
2000 Saturn SW2 1.9L Excessive Emissions, Surge, MIL Lamp on VIN: 1G8ZJ8274Z
P0172 (rich) will set idling or driving. O2 sensor B1S1 new and appears to function normally. O2 sensor B1S2 shows high voltage .800. Has a jerky feel while driving at constant speed. Using 2 spark testers set to 25KV I have checked both ignition coils. Spark ... Trouble codes: P0172 (O2 sensor Bank 1 Sensor 1 rich)

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Park Avenue 3.8L No Start, Stall VIN: 1G4CW53L9N
As expected, the ECM was the culprit. Thanks to all who offered advice. Paul from Florida and a few others pointed out to check the battery voltage reading on the scanner when the car failed - 0 volts. After re-checing wiring and grounds, we installed an EC...
1985 Cadillac Cimarron 2.0L No Start, Cuts out, Stall VIN: 1G6JG69P6F
This car ran perfect for the last thre days. Could not get it to stall or not start. Whatever was causing the problem fixed itself for now. I didn't do any further testing and the customer agreed to drive it until the problem returns. Many of the replies had m...
1996 Cadillac Eldorado ETC 4.6L Theft Lock VIN: 1G6ET1295T
Well pretty sure I have fixed this car,I had a few posts on the pcm.if the car cranks but does not start is has somthing to do with the PCM,also I could comunicate with all of the modules on the bus also there were no u-codes.Put a used PCM and reflashed.still...
2001 Cadillac DeVille 4.6L Misfire, MIL Lamp on VIN: 1G6JD54V21
I finally got the car to act up on me. I noticed that when it first started to miss the fuel trim was at about 0. AS it missfired the trim slowly went to 35. (i have already checked for vaccuum leaks multiple times). I had already switched the plugs, plug b... Trouble codes: P0300.
2003 Cadillac CTS 3.2L MIL Lamp on VIN: 1G6DM56N03
I've cleared the codes and the car is doing fine for now. We are currently looking into sofeware updates for the trans as suggested. Also all the powers and grounds were checked with no problems found. Trouble codes: P0700 (tcm request mill on).
1995 Chevrolet C3500 6.5L Stall VIN: 1GBHC34F0S
Exactly as you all posted- oil pressure switch. Would never have figured it out without help or diagram (usually, fuel pump operation is controlled by relay which is controlled by fuel injection CU). Much thanks, Kip.
1999 Chevrolet Blazer 4.3L u-joint VIN: 1GNDT13W7X
Wow, lots of replies,,all the replies had the same thing to say--one grease job will not help a rusty u joint---this customer is trying to get me to pay for a road trip breakdown to the tune of over $1000.00...I tried to explain to him that I did miss the grea...
2000 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDT13W8Y
Thanks to all of the great replies. We reinstalled the distributor and lined the rotor to the six on the distributor and it worked great. We were one tooth off. I have done about a dozen of these with no problems till now. timing came back to 0 and the code ... Trouble codes: P1345.
2003 Chevrolet Trailblazer LT 4.2L knocking in rear end VIN: 1GNES16S13
it was the link pins on the back part # [...] thanks again. Keep up the good work. Don G.
2004 Chevrolet Silverado 2500 HD 6.0L MIL Lamp on VIN: 1GCHC29U84
Thank you Roger, Richard & Mark. I had already done the tsb with the relocation of vent valve and new filter. So i took all of your advice and did all 3 ideas. I made another plastic jug with pre drilled holes and installed the vent valve filter inside it alo... Trouble codes: P0446.
1971 Oldsmobile cutlass 350CID rocker stud VIN: 332871M114
common consenus is... none.. almost a 50/50 split on repair on vehicle vs. removal..some interesting ideas though. a magnet from trans pan placed around mount to stop shavings from entering oil passages, freezing stud in freezer prior to installation, candle w...
1997 Pontiac Grand Am GT 2.4L No Start, Cuts out, Stall, MIL Lamp on VIN: 1G2NW12TXV
Good Day And thanks to all who answered , after tracing our intermittent no start many times we came to the ignition switch as the most common denominator . We did check the dash pod wiring and found no difference if we added a ground wire . we also check f... Trouble codes: P0342 (cam sensor), P1629 (theft fuel enable).
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