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Prev Professional Automotive Repair Technical Discussions for September 4, 2009
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Open Help Requests for GM
Help Request Answers
1988 Buick Century Limited 2.5L fuel pump VIN: 1G4AH81R8J
We are replacing fuel pump.There are two pumps for this car EP386 EP255.Which one do i use if i don't have the 3 letters on sending unit wire harness that Delco hotline describes either APH or ARA.
2002 Cadillac DeVille 4.6L Traction control light VIN: 1G6KD54Y52
The original EBCM did not have a C1298 communication error code. The stampings on the original module and used module match. I feel like the GM diagnostics are lacking on this concern and I need some direction. Any help by you GM guys will be greatly appreciat...
1983 Chevrolet G30 Chevy Van 5.7L No Start VIN: 2GBHG31M8C
This is a school bus runs good for about 2 hours, When when the driver shuts it off to load or unload students it won't restart, It floods, the last time to get it to start & run I had to pull the plugs and dry them & the cylinders with compressed air. Then it...
1990 Chevrolet Corsica LT 2.2L hard start VIN: 1G1LT54G9L
I have a 1990 Corsica with extended cranking time to start up.Fuel pressure is 10-11 psi and volume is 26 gallons per hour.When you shut car off, pressure drops to 0 psi.I have a shut off valve to dead head fuel pumps,and with this installed at the engine retu...
1991 Chevrolet Camaro Z28 5.0L No Start VIN: 1G1FP23F6M
Car came in with an intermittant no start or long cranking before starting complaint. The pick-up in the distributor was bad so distributor was replaced. Fuel pressure was low so fuel pump was replaced. The computer was replaced (not sure why, probably just a ...
1997 Chevrolet Express 1500 4.3L No Start VIN: 1GCEG15W9V
Hi Everyone, I have a 97 Chevy van in the shop that I cannot get to start. The owner stated the idler pulley siezed and broke the belt and he parked the van. Since then it will crank but not start. There is no spark, no fuel, and when turning the ignition swi...
2001 Chevrolet Malibu 3.1L Poor Idle Quality, Surge, Cuts out, Stall VIN: 1G1ND52J61
Hi all, I have this 01 Malibu that is giving some codes and not working well (surge,stall ,et.) If I clear the codes the p1374 only comes back right away (the others have not come back so I'm not so concerned with them just yet). I have went through the test f... Trouble codes: P1374, P1585, P0449, P0443
2002 Chevrolet Malibu 3.1L Cuts out, Stall, Misfire VIN: 1G1ND52J62
This Malibu is experiencing a stall and cut out condition intermittently, noticed more so when the engine is cold seems to lessen/go away after warming up. Originally had CKP codes, cleared codes and p1374 came back after a couple days. Checked 24x signal - go... Trouble codes: P0336, P1374
2002 Chevrolet Blazer LS 4.3L 4wd VIN: 1GNDT13W51
customer came in with check engine light on check for service codes code p1875 4wd low switch circuit. has auto 4wd. when light is switched from 2wd to 4hi or 4lo or auto, light just blinks you can hear actuator working when you switch from 2 to 4wd but light ...
2002 Chevrolet Silverado 1500 LT 5.3L moniters VIN: 2GCEC19V81
After repairing problem with evap ,the moniters will not run.We let customer drive the truck for about 2,000 miles.During which he came back a few time's to check moniters.Customer was told not to fill tank or run it almost dry so evap moniter could set.No luc...
2005 GMC Yukon XL 2500 SLE 6.0L Electronic VIN: 1GKEK63U55
Thank you in advance for the help. SUV came here from other shop that had replaced the blower motor.Blower motor will cut on and off over and over runs for 1/2 second. Has a B0229 active and should not be related to the blower operation.you can apply ground to...
2000 Oldsmobile Alero GLS 3.4L MIL Lamp on VIN: 1G3NL12E7Y
Hello all, This beauty persistantly throws the P0440 code after replacing the purge valve and degraded/collapsed line going to it. Smoke tested many times perfectly by actuating vent control solenoid via ECM, sealed tight. Replaced original fuel cap after hea... Trouble codes: P0440 (EVAP system malfunction)
1995 Pontiac Sunfire SE 2.2L No Start, extreme hard start VIN: 3G2JB5240S
This thing is killing us!! Car won't start after it's been sitting all night. We have spark, fuel, injector pulse, compression, etc.. If we pull the plugs, they're gas-soaked. If we clean them and retry, most of the time it'll start. If we hold the pedal to t...
2001 Pontiac Montana 3.4L abs VIN: 1GMDX13E31
this montana van came in and customer was complaining of a brake noise, rattling sound. we inspected brakes and found no problems. she also stated the problem has been there for several years. one day she came by and our technician drove with her and heard the...
2002 Saturn L200 2.2L Timing Chain VIN: 1G8JU54F72
Installing a head gasket on this engine. Have removed the head per Allldata. I have the engine a #1 TDC. My question is can I reinstall the timing chain where it was? Do I need to continue and remove the lower cover to reset the timing chain back on the colore...
2003 Saturn L300 3.0L MIL Lamp on VIN: 1G8JW54R43
Good afternoon all. I know this is late on a holiday weekend, but maybe it'll give ya time to ponder this one. This lovely 03 Saturn L300 with a 3.0l has a P0102 Mass air flow problem. I followed the diagnostic tree from Mitchell and it told me to check the wi... Trouble codes: P0102 (Mass air flow sensor circuit low frequency)

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Century Custom 3.1L Poor Idle Quality, Stall, MIL Lamp on VIN: 2G4WS52J11
Thanks for all the input, folks. This one turned out to be a bad pcm, in spite of it being a new factory reman. I noticed that the O2 voltage shown by the scan tool was lower koeo than I am used to seeing. I hooked my fluke into the sensor return at the pcm an... Trouble codes: P0101 (mass air flow performance), P0171 (fuel trim lean).
2003 Buick LeSabre Limited 3.8L EBCM Module VIN: 1G4HR54K53
Once again, thanks for everyones input. I got the vehicle back and took it to have the programming done. Would you believe, once again the people doing the programming called and said that they couldn't communicate with the EBCM, and that it had a bunch of cod...
1968 Chevrolet Corvette 5.4L Wiper VIN: 194678S406
Final story is we had the wrong wiper motor and major wiring problems. Someone tried to install a 1969 motor on a 1968 wire harness. I am not sure it ever worked on the vehicle. My question was how do I tell if I have the correct motor. Will [...] helped ...
2004 Chevrolet Trailblazer EXT LT 4.2L Poor Idle Quality, Stall VIN: 1GNDS13S84
I Want to thank everyone that responded to my help request. I especially want to thank Micheal from Illinois. He hit it right on the head. I pulled the connector on the cam phazer solinoid and it was full of oil. I replaced the cam phazer solinoid and the truc...
2004 Chevrolet Trailblazer LT 4.2L Hesitation, loss of power VIN: 1GTEC19M32
Cleaned the Throttle body and doesn't seem to do it any more. Thanks for all the help
2005 Chevrolet Silverado 1500 LT 5.3L t-case VIN: 2GCEK13TX5
sorry lost track of time, truch is fixed, retested powers and grounds tried to shift t case using jumper wires at tccm shift motor brake was holding strong,watched to make sure the brake wire was not geting grounded out while driving all ok,replaced tccm and f...
2006 Chevrolet HHR LS 2.2L No Start, Stall VIN: 3GNDA23D79
Based on numerous hits on cavaliers, we put in an ignition switch and let the customer drive and advise. After a month the problem has not reoccured. It was occuring every few days for the customer. I am calling it a fix with the ignition switch.
2006 Chevrolet Suburban 1500 5.3L rear latch/rear ac VIN: IGNEC16Z46
we removed the fuse box on drivers door jam, the wiring from the blown fuse circut is melted, insulation is burned off, the melted wire goes into the mainharness under the dash. we were going to try to seperate the circuts and see which circut had the excessiv...
2007 Chevrolet HHR LS 2.2L Poor Idle Quality VIN: 3GNDA13D37
2000 GMC Jimmy SLT 4.3L brake lights VIN: 1GKDT13W0Y
Received several replys on this one but only 3 of them got it right. It was as they suggested the turn signal switch assembly. Something had obviously shorted inside of it and caused all kinds of wierd problems. Thanks again for all of the replys and have a gr...
2002 Oldsmobile Bravada 4.2L transfer case VIN: 1GHDT13S22
I haven't fixed this one yet. The customer is taking his sweet time to get around to it. Here's what I think is happening though. I believe the something along the lines of the module engaging the motor too long and burning it out. The shaft turns freely witho...
2003 Pontiac Aztek 3.4L no guages, lost comm VIN: 3G7DB03EX3
I found out this vehicle failed New Jersey emissions. The fail ticket read o2 sensors not ready, EVAP not ready, EGR not ready. The inspection failed before the owner noticed any problems with the vehicle so its been a problem longer than the owner realized. I... Trouble codes: U1016, U1040 (Lost Communication with EBCM), U1096 (Lost Communication with Instrument Cluster).
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