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Prev Professional Automotive Repair Technical Discussions for April 14, 2008
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Open Help Requests for GM
Help Request Answers
2002 Buick Rendezvous CXL 3.4L ses+security messages VIN: 3G5DBO3EX2
hey gang,this is the 1st time iv'e dealt w/ class2 data faults, need some help here, Iv'e got ses+ security messages toggling back+ forth on the small message screen in instrument panel, When watching my vertronix "Mastertech" the communi. code#s U1000+ U1064 ...
2003 Buick Rendezvous CXL 3.4L abs sensors? VIN: 3G5DB03E62
customer stated feeling started past thursday. friday i verified on a roadtest. do NOT do it all the time . it will happen in drive or reverse. again no codes. did check for TSB. none found related to the problem. called local dealer GM no help found. checked ...
1995 Chevrolet K1500 Cheyenne 5.7L Hesitation, Cuts out VIN: 1GCEK14K1S
well this one should be a easy fix but has not been. I drove this truck first and felt like exhaust restricted or lack of fuel as it runs well until you step it to wide open then you can feel it holding back and it does not want to shift as if it has a heavy l...
1996 Chevrolet K2500 Suburban LS 7.4L Excessive Emissions, Poor Idle Quality, Hesitation, Stall VIN: 3GNGK26J1T
This starts right up first thing cold when it get to operating temp. the idle rolls from 600rpm-1200rpm. At operating temp. once in a while it has a hard start problem. The STFT is 128, LTFT is about 132 on both banks. MAP is 1.99-2.17 volts MAF is 8.1-8.6 gls...
1997 Chevrolet Camaro Z28 5.7L MIL Lamp on VIN: 2G1FP32P1V
We have a 1997 Chev. Camaro in the shop with a failed charcoal canister. I suspect the failure was due to fuel getting into the canister. Between the canister and fuel tank there is a pressure control valve that is in good working order. My question is this......
2000 Chevrolet S10 2.2L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCCS1953Y
hello, im having a tought time with this truck!! it feels like the cat converter is pluged, but unhooked the cat converter. we have the same problem. it dosent seem to want to rev up very well. seems almost like a timing chain problem but the compression is go... Trouble codes: 300 (multipal misfires)
2000 Chevrolet Cavalier 2.2L noise VIN: 1G1JC5246Y
Hello everyone. Customer came in complaining of noise / vibration when moving and in park. We verified the noise in park. It makes a slightly loud humming noise as soon as the park pin stops the car from moving. Wont make the noise until it catches. We have no...
2001 Chevrolet Silverado 2500 HD 8.1L Transmission VIN: 1GCHK23G51
I have a Chevy 2500HD that has an intermitent problem. During steady light throttle in O.D. it seems to go to neutral and makes a metal banging scraping noise.If you let off the throttle and continue the noise goes away and trans shifts fine. A check engine li...
2001 Chevrolet Malibu 3.1L Cooling Systems VIN: 1G1ND52J41
Hello to everyone. Have a question about this Malibu. I have to do the heater core and was wondering if my eyes decieve me or is this the same style as before where you take off lower cover or do you have to pull the dash and R&R the full module as alldata say...
2002 Chevrolet Corvette 5.7L Will not run when put in gear VIN: 1G1YY22G27
A high end used car dealer had this car in on consignment. Customer says he never had a problem with it. After a couple days they went to move it and it would start fine but as soon as it was put in gear it would shut off. After it was towed in we suspected t...
2005 Chevrolet Corvette 6.0L drivers pretensioner VIN: 1G1YY24U05
car has fault for drivers pretensioner circuit open, high bat volt and low bat volt. cleared codes and pretensioner circuit reappered. Is it usually just a bad pretensioner or is there a more common fault? the connector under the seat looks clean and tight. th...
2006 Chevrolet Express 1500 4.3L Stall VIN: 1GCFG15X26
Van has a habit of intermittanly "dying" but restarts right back up / also complains of "chugging/ loss of power" also intermittant - no pattern of stalling/ problems from what I can tell - can happen warm / cold . Can stall at idle and at freeway speeds -- NO...
1995 Geo Prizm LSi 1.8L No Start VIN: 1Y1SK5280S
Thanks to all that reply. Sorry for the long post but Ive got a real doozy here. Vehicle came in on the hook. No crank no start condition. Weekend tech determined that distributor was the cause (no spark or fuel pulse) and replaced it with a reman unit. Now th... Trouble codes: 12 (No distributor signal is inputed to PCM), 13 (Crank signal is not inputed to PCM), 14 (ignitor signal from ignitor is not inputed to PCM), 24 (IAT input at PCM open or shorted)
1984 GMC C2500 5.7L Alignment VIN: 1CTCC24H8E
Could anyone please tell me the Steering Axis Inclination (SAI) specification for this 84 2WD 3/4 ton pick up? Thank you in advance.. Arne
1995 GMC Yukon 5.7L No Start VIN: 3GEKE189KS
hey techs im stummped i put a new cam lifters push rods head gasket oil pump and pan gasket i have good fuel and spark i fired it off base timed it and started to break in the cam every thing was perfect for 15 min then the motor just died out now it seems lik...
1999 GMC K2500 Sierra SLE 7.4L Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1GTGK23J6X
hey all need some help[ on this one. installed reman longblock customer pick up and drove fine for about a week.then it stated stumbling on him. got the truck back at the shop found codes p0102 checked maf and it is not having any activity replaced drove and d... Trouble codes: P0102
2002 GMC Sonoma SL 4.3L No Start, Stall VIN: 1GTCS19W92
We've also checked the fuel pressure after installing the pump, checked to specs. This time we are taking the bed off instead of the tank down as to not disturb the wiring just in case all this time it's got a broken wire and it just happens to make contact af...
2002 Pontiac Grand Am GT 3.4L Key doesn't turn VIN: 1G2NW52E22
This car was towed into our shop with the owner telling us that he couldn't get the windows and the sunroof closed. When the vehicle arrived at our shop, we found that the key will not turn in the ignition at all. The steering wheel does not lock. TIA.
1999 Saturn SW2 1.9L Hesitation VIN: 1G8ZK8272X
vehicle came in,lack of power on accel and poor shift.miss on #4.did tune up no more miss but still no power,replaced cat because it was giving that burning smell .still no power.had a few where the ect sensor was corroded bad but looks like it has been replac...
2003 Saturn L200 2.2L fuel gauge VIN: 1G8JU54F13
FUEL GAUGE ONLY AFFECTED. ALL OTHER INSTRUMENTS, OK Car comes to me with irratic fuel gauge readings. Customer confirmed he had just under 1/2 tank as he put in a certain amount of gas before he came in. I hooked up with Modis and was able to read sender outpu...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Roadmaster 5.7L Brake pedal VIN: 1G4BR8779P
Thanks for all the replies and helpful information. The combination valve was replaced with no change. The master cylinder was isolated and remained rock hard.The hoses are in good condition with no signs of bulging. Calipers and wheel cylinders are new, holde...
1994 Cadillac Fleetwood 5.7L Surge VIN: 1G6DW52P4R
I want thank everyone that provided help with this problem. All your suggestions were good, but the fix was totally unexpected. I test drove this beast with the Tech 2 snapshot and watched all traditional parameters,MAF,TPS,IAC,EGR etc, and graphed them. There...
1995 Chevrolet Beretta 2.2L Surge VIN: 1G1LV1549S
Thanks to all that responded, I knew that the egrs are weak but never paid att. to the command sig. on scan tool so I guess to much thought was involved. I replaced egr valve and it has been 4 days and all is well and good. Thanks again to all who helped
1999 Chevrolet Astro 4.3L MIL Lamp on VIN: 1GNEL19W7X
Reset fuel trims by connecting battery cables together. Fuel trims were reset and continue to be stable. The only thing we found out of whack on this van was the PCV valve insides were gone. Replaced valve and will wathe the codes. Thank you Trouble codes: P0420 (Catalyst low efficiency).
2000 Chevrolet Tahoe LT 5.3L t/s flasher VIN: 1GNEK13T4Y
The customer finaly decided to spend the bucks to get rid of his flasher noise. We replaced the multifunction sw. Thanks for the replys. Just about everyone said it was the switch or the grease is tne switch causing the problem. Thanks again to all that re...
2002 Chevrolet Astro 4.3L Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1GCDM19XX2
Well guys, thanks for all the great replies, you all are was a plugged cat...removed oxy sensors and bingo, started right up and idled smoothly...thanks again for your quick responses... Trouble codes: P0101.
2005 Chevrolet Cavalier 2.2L Mechanical VIN: 1G1JC52F85
Gentlemen, My apololigies for the delay.I replaced 2 lifters which were identified by running with the valve cover off and all seems well. Thank you for your responses
2006 Chevrolet Cobalt LS 2.2L engine VIN: 1G1AL5SF66
im sorry it took so long to reply the engine came out the top with no problem the book gives you 11 hrs and i would do these all day long .
1997 GMC Savana 3500 5.7L Misfire, MIL Lamp on VIN: IGDJG31R9V
thanks everyone for ur help.the fuel filter was the problem we were finding the right fuel pressure but not volume i think,and it was badly plugged with murky stuff. we even took some gas out to see if there is some thing in the tank but couldn't find anything... Trouble codes: P0131, P0137, P0138, P0140, P0141, P0157.
1999 GMC Sierra 1500 SL 5.3L No Start VIN: 1GTEC14T3X
Thanks for all the help. Will from Ohio hit on the head. I started unplugging modules to see if the class 2 data line would come back alive. When I got to the BCM the scan tool came alive. Replace BCM and sub-let the programing and theft relearn to at shop dow...
2002 GMC Yukon XL 1500 SLE 5.3L oil pressure gauge VIN: 3GKFK16Z02
we have given the customer his options and at this point he will live with it, if he changes his mind and wants it replaced I will update, thank you for all of your replies.
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