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Prev Professional Automotive Repair Technical Discussions for November 19, 2009
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Open Help Requests for GM
Help Request Answers
2002 Buick Century Custom 3.1L abs VIN: 2G4WS52JX2
Attention Buick gurus: We have a code c1233(rf wheel speed circuit open or shorted). We have tested the hub and bearing assembly and related wiring and diagnostics according to Mitchell and have come to the conclusion that the ABS unit is faulty. We have watch...
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1993 Chevrolet C3500 Cheyenne 5.7L Hesitation, Stall VIN: 3GCJC44K9P
hi all! please help me w/ this one this truck is fine when colt but after 10 min, cuts out and sturb for fuel the only way runs if i dead head fuel pump i get 28 psi and truck runs good by the way the o2 sensor wires r gone i dont know if somebody took em out ... Trouble codes: 13 (02 sensor), 34 (map sensor)
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1994 Chevrolet S10 LS 4.3L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1GCDT19W38
Customer brought this truck into our shop about a month and a half ago- see related repair history for work performed then. vehicle left shop in good running condition. NOW vehicle is back and when i drove it it seemed fine until i got it back into the shop pa... Trouble codes: 44 (lean exhaust)
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1995 Chevrolet Lumina 3.1L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on
hard start runs rough when cold after it sits overnight.Code for low map voltage.Scanner reads .02 volts for ,MAP signal KOEO.Disconnect MAP sensor 5 volt ref present .Jump ref voltage to signal at MAP sensor scanner still reads .02 volts.Disconnect ecm A conn... Trouble codes: 36 (map voltage low)
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1997 Chevrolet C-Series Kodiak C6H042 7.0L Poor Idle Quality, Surge, HARD START WARM VIN: 1GBJ7T1PVJ
this school bus came in for no power when warm-verified complaint ran ok cold but once warm it had no power, fuel pressure was 9 psi (13 psi spec) so replace the pump-same problem. installed a new ignition module and the no power issue is solved. (I wanted to ...
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1999 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEC13R6X
This tahoe has had new plug's ,wire's cap&rotor by the owner to try to correct the problem. The misfire is on cyl's 3&5,I can not find any vacuum leak's ,I have changed the injectors {suggested by another shop} for those cyl's with no change.The spark plugs on... Trouble codes: P0300 (Random misfire)
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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...
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2002 Chevrolet Cavalier 2.2L No Start VIN: 3G1JC52452
I CHECK SPARK AND FUEL FOR THE NO START I DID NOT HAVE NITHER OF THEM AND WE CHECKED CRANK SENSOR WE HAD SIGNAL AND NO POWER GOING TO FUEL PUMP AT ALL, WE FOUND COROSSION AT THE FUEL PUMP PLUG,BEFOR WE DID ANY REPAIRS TO THAT I TOOK THE BACK SEAT OFF TO CHECH ...
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2004 Chevrolet Trailblazer EXT LS 4.2L MIL Lamp on VIN: S042182277
took the hoses off the secondary air injection pump and about a cup of water came out. once i dry it off clear the code sent the costomer on his way whinin a week same problem occurs. did a smoke test no leaks etc Trouble codes: P0410 (secondary air injection)
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2004 Chevrolet Trailblazer LS 4.2L Cam shaft actuator VIN: 1GNDT13S24
There is a leaking intake valve on cylinder 1, My question is when you start disassembling it says to make sure exhaust cam shaft is fully advanced prior disassembly,reassembly, but there is no clear answer as to how you advance it. Can some one shed some ligh...
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2004 Chevrolet Epica LT 2.5L Misfire, MIL Lamp on VIN: KL1VM52L84
thanks in advance . we are having some difficulty with a intermittant miss fire concern . there is limited info on these vehicles . as we disconnect individual ignition coils , the miss fire will show up at three coils then the next time , may be three diffe...
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2005 Chevrolet Trailblazer LT 4.2L Cuts out, Stall VIN: 1GNDT13S25
Hello Group: I hope some one has the answer on this one. Customer came in for an oil change and complained that a couple of times when she cranked th engine over the engine cranked slow and the clock lost it's time. The battery was 4 years old and the chatging...
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2006 Chevrolet Silverado 1500 WT 4.3L gear engagement VIN: 1GCEC14X26
poor engagement into gear sitting still with engine running. replaced clutch and still have same issues. hydraulics have no adjustment.
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1991 GMC S15 Jimmy SLE 4.3L clutch fork VIN: 1GKCT18Z2M
Clutch fork hitting bell housing.Clutch fork is at travel limits. Clutch will not dissengage. Pedel not going to floor, master cylinder is at travel limits. Have replaced clutch disc,pressure plate , throw out bearing , pilot bearing , master cylinder and slav...
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2001 GMC Savana 2500 6.5L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GTGG25F71
Customer brought van in 1st time for stalling, misfire, loss of power while driving. Customer stated van is on 3rd injection pump, in 3 years and it was acting exactley as all the other times the injection pump was replaced. Pulled 4 codes out of vehicle as li... Trouble codes: P0266, P0269, P0275, P0284
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2005 GMC Envoy SLT 4.2L Engine VIN: 1GKDT13SX5
If this Envoy is started cold it make a nosie almost like a jet engine. If it is shut off it sounds just like a vacuum cleaner winding down. It continues to make this noise for a few seconds after the engine and fan have completly stopped. I cannot pinpoint th...
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1994 Oldsmobile Cutlass Supreme 3.1L Steering/abs? VIN: 1G3WH55M7R
Customer complained that while driving 75 on the highway with cruise on vehicle suddenly jerked hard to the right and sounded like he hit something, looked and didn't see anything and vehicle felt normal, about 30 miles later it did the same thing, loud noise ...
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1996 Oldsmobile 88 Royale 3.8L Starting VIN: 1G3HN52K8T
Vehicle towed in with NO battery,with intake plenum laying in pieces,customer said it backfired one morning trying to start it.He left it sit for a few years then I got it.I replaced the upper intake manifold,the spark plugs, and the lower intake gaskets.When ...
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2000 Oldsmobile Bravada 4.3L No Start VIN: 1GHDT13WXY
vehicle will ot start only when below 30 degrees outside starts fine other wise
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1998 Other GM h1 6.5L Unknown VIN: 137ZA8332W
Hi, need some assistance from you Gm techs. This hummer has a 4L80e transmission,powered by a 6.5 turbo diesel. After coming to a stop when you go to take off the transmission feels like its not in gear/slipping then after you give it enough gas it shifts hard...
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1998 Pontiac Grand Prix GT 3.8L Excessive Emissions VIN: 1G2WP52K3W
Vehicle failed an emission test. High CO and HC readings at idle. The pre-cat O2 sensor remains high voltage at a stop after a cruise. Installed new spark plugs and wires and replaced the O2 sensor. The new one does the exact same thing, it stays high voltage ...
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2000 Pontiac Bonneville SSEi 3.8L Excessive Emissions, Poor Idle Quality, Misfire
firts off this is not a car guys this is my project sand rail i got the motor, wire harness and pcm out of a wreck bonneville 3.8 supercharged no enigne damage just rear hit. had pcm sent out for programming to remove trans,bcm,ect only rear o2 sensor was remo... Trouble codes: U1000, P0640
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2001 Pontiac Aztek 3.4L Information display VIN: 3G7DA03E01
Security and battery light are flashing. Vehcicle starts and runs fine. All we did was replace battery. Guages were not working. Did reset. They work now but lights still flashing. Tried Passkey reset. Security light does not go out or go on steady after 10...
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2002 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NF52E42
Customer brought vehicle in and had complaint of intermittin no start always cranks good but sometimes just wont start normally cold or after sitting for a while, but the strange thing is if you disconnect the battery and reconnect it it fires up right away an...
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2004 Pontiac Grand Prix GT1 3.8L power steering
hello everyone, this car came to me with a whine noise when cold. i drove it warm and it had a slight whine that was the loudest at the p/s pump. i checked it the next morning cold and the pump was extremely loud, it sounded like it was low on fluid but the le...
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2000 Saturn SL2 1.9L No Start, no com at dlc for ob VIN: 1G8JW82R5Y
i am not good with can syst i think it might be in it somewhere i can git com only through genar not through veh speci info the dlc pins 2. 4. 5. 7. 16 have pins 2 is verable 4 195ma oms 5.1.5 oms 7. 8.68 v 16. 12.50 v koeo 2 ver 4. 195.ma 5. 0 7 ver 16. 10.60... Trouble codes: U2105
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Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick Reatta 3.8L No Start, Stall VIN: 1G4EC13CXL
as my manager said, i slayed the dragon. after posting the help request, it went downhill a little, after going a little crazy tugging on harness' and rechecking my checks, the thing wouldn't even crank anymore, period. which is a good thing. back to basics a...
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1995 Buick Regal Custom 3.8L No Start, Stall VIN: 2G4WB52L7S
well I believe we have solved problem. It has been sometime and the vehicle has been working properly according to customer. We found that the seat bracket was broken badly, and the wire harness that is under the seat for the power seat options was being cut...
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1997 Buick LeSabre Custom 3.8L Electronic VIN: 1G4HR52K4V
I ended up finding a used controller and that seems to have solved the problem. Thanks to all who helped your advice was greatly appreciated
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2005 Buick Rendezvous CXL 3.4L cluster VIN: 3G5DA03785
I THOUGHT I HAD GOT THIS ONE CLOSED, BUT MAYBE I HIT THE WRONG BUTTON OR SOMETHING. IT WAS THE PCM CAUSING THE FAULT. IT WOULD NOT SHOW UP ONE THE MESSAGE MONITOR, BUT YET WOULD STILL READ DATA ON THE TECH 2 SCREEN. AND THAT IS WHAT WAS THROWING ME FOR A LOOP....
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2001 Chevrolet Impala LS 3.8L starting and instrument gauges VIN: 2G1WH55K41
First of all, thanks for the replies. All of my testing indicated BCM problems. Sent this one to a dealer(reprograming bcm requires specific equiptment) Dealer replaced ignition key and switch, also replaced pcm and reprogramed BCM. It starts now. Good luck w...
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2002 Chevrolet Silverado 3500 6.6L Won't Shut Off VIN: 1GBJK34132
After re-verifying correct ign switch installation for the 3rd time and not finding any wiring problems, I took Herman's suggestion and disassembled the underhood fusebox. This is an oilfield truck that lives in some fairly nasty environments so this course of... Trouble codes: P0540 (Intake Htr Feedback Ckt), U1041 (Lost EBCM Communication), P0562 (Low Sys Voltage), P0880 (Undefined), U1096 (Lost IPC Communication), B1367 (Ign 0 Device Low).
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2005 Chevrolet Silverado 1500 HD 6.0L front drive axles VIN: UNKNOWNVIN
Well, thanks everyone. Fix ended up being the encoder motor position sensor.
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2005 Chevrolet Uplander LS 3.5L abs VIN: 1GNDV23L55
well guys sorry for the delay but i wanted to make sure i didnt hear from the customer. well with a gm diagram i checked all my power and grounds after that i cleaned both sides of the harness and coated it with dielectris grease cleared the code and put about...
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2006 Chevrolet HHR LS 2.2L No Start, Cuts out VIN: 3GNDA13D36
This one is fixed,The customer wanted nothing to do with a dealership,So after rechecking all wiring,inputs and outputs of bcm and ecm,we installed a new ecm reprogramed with tis and drove the car for 2 days.thanks for all the help Trouble codes: P0601, P0340.
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1996 GMC C1500 Sierra SLE 5.0L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1GTEC14M7T
Thanks so much.Recived some very good info.Thanks to Daniel,Donald,Mike,and Fred i began to have a close look at the wiring.It was shorted to ground where the harness goes past the abs motor.It would move just enough when opening hood or leaning over fender to...
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2005 GMC Sierra 2500 HD 6.6L battery draw VIN: 1GTHK23235
vehicle seems to be fixed. i recharged the batteries individually and load tested them and found 1 battery that failed the load test. replaced that one battery and everything seems good now!! i'm use to only dealing with one battery so this one kinda threw me ...
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2000 Oldsmobile Bravada 4.3L outlet temperature VIN: 1GHDT13W0Y
THIS ONE IS GONE. I CHECKED THE OPERATION OF THE ACTUATOR AND IT DID MOVE WHEN THE REQUEST WAS SENT BY THE CONTROL HEAD. BUT I DID REPROGRAM WITH PULLING FUSE AND LEAVING IT OUT FOR ABOUT 20 SECONDS. THE ACTUAL PROBLEM WAS THE THERMOSTAT HOUSING WAS LEAKING AN...
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