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Prev Professional Automotive Repair Technical Discussions for June 18, 2007
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Open Help Requests for GM
Help Request Answers
1996 Buick Regal Custom 3.1L MIL Lamp on VIN: 2G4WB52M6T
Hello all, could use a little help on this one. vehicle keeps setting code p0401 egr insuffient flow. removed egr valve to inspect passages, no restriction found. we then did a induction flush to remove any carbon. After induction flush we noticed that the map... Trouble codes: P0401
1968 Chevrolet impala 427CID mystery part
During disassembly of the th400 trans for overhaul, I was removing the valve body & other bottom end parts & placing them in the trans pan when a part appeared out of nowhere!!! Ita a small cup plug, .250" in diameter & .250" long with no orifice hole in it. I...
1993 Chevrolet K1500 Suburban Silverado 5.7L Poor Idle Quality, Surge, Misfire VIN: 1GNFK16K9P
We have been fighting an idle problem. Engine will surge usually only when hot and is intermittant at times. Almost feels like a lean misfire. Occasionally will die when comming to a stop. The code 43 ESC failure has just come up today after 2 days of diagnosi... Trouble codes: 43 (ESC failure)
1998 Chevrolet Blazer 4.3L Cooling Systems VIN: 1GNCT18W3W
This is my Blazer and has had an overheating issue for a long time. It is always when the ambient temp is up over 90 and at higher speeds. The radiator was replaced first when the original one started leaking. Then, a leak appeared from intake manifold gasket ...
2004 Chevrolet Optra 2.0L Starting VIN: KL1JK52ZX4
Hello everyone. We have a 2004 Chevy Optra (aka some sort of small Kia) that exhibits a hard starting condition after it is filled with fuel at the gas pumps. As the customer mentioned, if she fills the tank at the pumps, it will crank over and not start unles...
1999 GMC Savana 3500 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTHG39R3X
Ok, so this vehicle came in with PO1345, removed the distributor cap, rotor was loose, replaced cap and rotor and rechecked. Cam retard was at 16. Removed distributor assembly, found that distributor gear was severely worn, replaced distributor, set cam retard... Trouble codes: P1345, P0300
2001 GMC Sonoma SL 4.3L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GTDT19W71
this jimmy came in for low/surge idel,check engine lt stall runs rough,fuel pressure a little low,replace pump and now ok. tps code for low reading,replace tps and code returned as soon as engine warmed up.graphed tps signal with solus,steady .49 volts untill ...
2003 GMC Envoy SLT 4.2L Mode Door Motor VIN: 1GKDS13S23
Have had two vehicles do the exact same thing less than one week apart. The only repair perfomed on either vehicle was changing out the factory Delco batteries because of slow/no start conditions. In both cases, the heating/AC system was working properly prior...
2003 GMC Savana 1500 5.3L Fuel tank VIN: 1GDFG15T43
The fuel tank is leaking on this van, Around the filler neck.The dealer says no problem a new tank is $ 1000.oo , the hose fits tight and seems fine , the dealer also says filler neck part of tank is not available seperatly .Has anybody ran into this before, A...
2003 GMC Yukon Denali 6.0L engine VIN: 1GKEK63U93
this veh came in from a local used dealer, diagnose by the gmc dealer as having a blown head gasket. customer also said he had a check eng light for multiple misfires. pulled the heads and sent to machine shop, they resurfaced both heads and checked lifters. f...
1989 Oldsmobile Cutlass Ciera SL 3.3L Hesitation, Cuts out, Stall VIN: 2G3AM51N8K
have a 89 olds 3.3L no codes, fuel pressure OK, spark OK, scan data all normal.have checked TPS, MAF, CTS, Injectors, car starts normal and idles, BUT if you touch the gas peddle the car dies,you can feather it and get some rev but still dies ONLY in Park and ...
1997 Pontiac Grand Am SE 3.1L Poor Idle Quality VIN: 1G2NE52M4V
Vehicle returned with same symtoms as before racing Idle. Scanned, no codes. Smoke test intake, no leaks.Swap IAC,TPS with known good ones ( From my car) EGR removed and inspected looks Ok Tests Ok. Wiggle test Ok no change when engine racing. While scanning n...
1995 Saturn SC2 1.9L Poor Idle Quality, Hesitation, Surge, Stall VIN: IG3ZDG6ZS1
engine light was not on ,but checked codes any way and. code 53 knock sensor - too much knock present shows up.if anyone could piont me to where to start with this code thanked ahead of time,and would this sensor or code make it run like this.wont go over 2000... Trouble codes: 53 (knock sensor too much knock present)
2003 Saturn LW200 2.2L climate contrl VIN: 1G8JU84F83
Hello to all, This vehicle come in with warm A/C. Dye tested to find a hole in the condensor caused by the cooling fan. Replaced the condensor and receaver drier,put a vaccum on the system for 45 minutes and recharged with 2.09 lbs. of R-134a. The system is ru...
2005 Saturn Vue 2.2L transmission VIN: 5GZCZ33D45
My sources say the TCM is at the left front shock tower but I cant locate it. The PCM is attached to the engine and has code P0700a. I am assuming this is a generic transmission code and the TCM will have more precise info if I could acess it. Mac Mentor wont ...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Century Limited 3.1L readiness monitors VIN: 2G4WY52M5W
Well folks thanks for all the help. Although we did not completely fix the car (CAT and EGR never got into ready status.)our state allows two not ready's for inspection. After a couple of more attempts on the drive cycles we were able to get the EVAP and H02S ...
2000 Buick LeSabre Custom 3.8L Air Bag VIN: 1G4HP54K3Y
After trying everything that i could think of and all the things that everyone had said the problem would still not go away. I cleaned and checked every ground that the computer told me the car had. i replaced the ignition switch, i found a donor car that i sw...
1994 Chevrolet Corvette 5.7L front brakes VIN: 1G1YY22PXR
Thank you all for your help and comments. Most of you were correct in suspecting the power booster, as we did initially. Even the GM booster needed adjustment on the rod. The Mitchell manual said that the rod SHOULD not be adjusted, and also that there is no...
1995 Chevrolet C2500 Cheyenne 6.5L Injector Timing VIN: 1GCGC29FOS
Thanks I found out from some replies and from OTC that the Genisys cannot put the ECM in set timing mode but since I only replaced the pump I just had to read the difference from the desired timing and the measured timing and if it was less then 1 deg it wa...
1995 Chevrolet Monte Carlo Z34 3.4L First gear VIN: 2G1WX12XXS
Sorry to say we had to let this one go. Customer has picked up vehicle in it's current condition. Real sorry we couldn't get this fixed. I do appreicate the helpful replies. Thanks.
1996 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC1249T
This one is fixed. It ended up being a bad ground to the ICM. Thanks for all the good advice.
1997 Chevrolet K1500 Suburban 5.7L Poor Idle Quality, Surge, Cuts out, Misfire VIN: R7VG112997
I replaced the alternator and it seams to be fixed. It seams that it started to glich about 2000 rpm. I realy appreciate all of your help. Thanks Jim
1998 Chevrolet Blazer 4.3L circuit 41 melted VIN: 1GNDT13W4W
I ended up calling Alldata to get the info that I needed. They went to the GM website in order to find the proper diagram. It ended up that the "C" term. on sp200 is the B+ supply for the heated seat switches. For the time being the vehicle owner elected to...
2001 Chevrolet Astro LS 4.3L differential VIN: 1GNEL19W21
I received many responses to this post and I appreciate all of them. They did differ quite a bit with some people saying this was common and some saying it was not. Some people recommended replace the entire rear and some suggesting to rebuild it. I decided ...
2002 Chevrolet Silverado 2500 HD 8.1L Misfire, Poor Fuel Economy VIN: 1GCHK29G22
Well, this truck is fixed.It was sort of a convoluted bunch of problems and fixes though. The transmission heating was fixed by removing the radiator and washing and blowing it out thoroughly. The misfiring got a new ecm for code p1683 ,an updated crank sensor... Trouble codes: P0218, P1683, P300, U1041.
2006 Chevrolet Impala LS 3.5L air bag light VIN: 2G1WB58K26
Hi Guys, the vehicle appears to be fixed. I received 3 replies. Wade said to wires etc under the seat. Between moisture and chaffing this could be an issue . He also mentioned trying to disconnect something to verify the SDM could recognize a fault. Didn't get...
2000 Geo PRISM 1.8L Hesitation, Stall VIN: 141SK528X1
thanx again folks i aleady closedthis request once i thought .it was the maf.i tried cleaning still didnt work checked wiring harness and wires no luck replaced the unit and now it runs great thanx again
1970 Pontiac Catalina 355CID Brake pressure VIN: 252390E636
we replaced the master cylinder with another one, and checked the adjustment on the rears, bled and bled and bled. the customer decided to pull the plug and said he would call us if he found the fix.after all we relpaced and bled i suspect the rubber brake lin...
1998 Pontiac Sunfire SE 2.4L daytime runnung lights VIN: 1G2JB5246W
Thanks to everyone who replyed. Many helpful tips..7 ofyou nailed it. and even though I had read a post in the fix it section with the correct diag. I thought I'd had inspected the harness well enough to say it was ok. Needless to say I was wrong.. I liked P...
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