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Prev Professional Automotive Repair Technical Discussions for November 6, 2009
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Open Help Requests for GM
Help Request Answers
1988 Buick Regal Custom 2.8L No Start VIN: 2G4WB14W8J
hey everyone, regal is a semi 5 volt from ecm, rpm shows 6398 rpm with key on engine off. my question is where does ecm recieve its rpm signal. mitchell shows no wire for engine speed or rpm to ecm. it only shows crank sensor to ign. module.have to ...
2005 Cadillac Escalade ESV 6.0L cuts out left turns VIN: 3GYFK66N15
This vehicle came in to our shop on slow left turns vehicle will cut out checked for codes no codes storke check for TSB's none on this problem using tech 2 check pids and i can watch it happen but affects everything when it happens bucks and jerks like loosin...
1990 Chevrolet C1500 454 SS 7.4L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GCDC14NXL
This truck had the motor overhauled by a tech student. the problem started about 200 miles after it was over hauled. they put headers and edelbrock intake on. air pump gone. no mufflers or cats. it also has a auto meter tach. this truck goes nuts. sometimes at...
1999 Chevrolet Express 3500 7.4L Poor Idle Quality VIN: 1GBJG31J4X
This van came in with a surging idle. We can not get the codes to reset. It will intermittently idle down to 400 rpm and then idle up to 950 rpm. The o2 sensors will cycle from 65mv to 855 mv. It will also randomly miss on all cylinders with the counts never e... Trouble codes: P0171 (lean fuel), P0507 (iac high rpm)
2001 Chevrolet Impala 3.8L Starting VIN: 2G1WH55K01
Help all GM Techs!! Our GM guy is out for surgery and we had to replace a BCM on this Impala. We followed the Tech 2 instructions, down loaded the software from the web and installed it in the vehicle. We had the BCM fuse out during the process as noted on the...
2005 Chevrolet Express 3500 6.0L spark VIN: 1GBJG31U95
hi guys have a bit of a strange one here.the truck will start most of the time but when it does not start the check engine light will flicker and stay on the whole time you are cranking.while it is in no start mode there is no spark but i think the injectors a...
2006 Chevrolet Silverado 1500 LT 5.3L Poor Idle Quality, Misfire VIN: 2GCEK13T76
This truck came in for a tune up and check engine light. P0300. Tuned up the truck and ran much better. New A/C Delco plugs, wires, fuel filter, and air filter was nearly new. Came back with a P0300 code again. With scanner hooked up, we can watch #5 cylinder ... Trouble codes: P0300
1999 GMC Jimmy SL 4.3L rear hatch glass VIN: 1GKDT13W4X
i am having a problem tracing down the reason that the rear hatch glass is intermittingly poping open. it is causing the interior lights to com on un knowingly , in result the interior lights drain the battery. i have been unable to duplicate the problem and t...
2001 GMC Sonoma SL 2.2L monitors VIN: 1GTCS14531
truck will not set evap and secondary air pump monitors? there are no pending codes, everything checks out, air pump does run and is getting to the exhaust, pcm has been flashed, over 2000 miles and it still wont set and the cel will not come on?
2005 GMC Sierra 2500 HD 6.6L battery draw VIN: 1GTHK23235
hello, i have this truck that the batteries will go dead after 1-2 days of truck sitting. i have checked for a draw and i have about 165-170 milliamps. sometimes though i have had a draw upwards of 5-6 amps. the positive battery connections (the main fuse box,...
1997 Oldsmobile Aurora 4.0L MIL Lamp on VIN: 1G3GR62C9W
1997 olds arora 4.0l evap p0440 found leak but the ftps is not showing voltage or inches in h20 in tank tested ftps resistance was veary high also checked 5 volt referance on sensor it was ok the new sensor did not fix problem. if anybody has any input please ... Trouble codes: P0440 (evap small leak detected)
2000 Oldsmobile Silhouette GL 3.4L Hesitation, Surge, Cuts out, Stall VIN: 1GHDXO3E4Y
car came in with intermittent cut out condition and stalling periodically. no check engine light comes on when problems occur. factory tach starts bouncing when the vehicle cuts out. no current or history codes and fuel pressure is good and charging system is ...
2000 Pontiac Sunfire SE 2.2L No Start, Poor Idle Quality VIN: 1G1JC5246Y
We replaced The fuel pump because there was no fuel pressure. Now have lots of fuel pressure but cylinders seem to not be getting fuel. (plugs not soaked and no fuel coming out when plugs are out.) changed the coils to a used set on a whim and car fired up and... Trouble codes: P0621

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Century Custom 3.1L No Start
It is with great joy I can say this damned thing is finally fixed. Thanks to everyone who replied. I decided to concentrate on the fact that the pcm kept setting 3X codes and figured something had to be messing with that signal. I figured the replies that sa... Trouble codes: 1374 (3X signal intermittent).
2002 Buick Regal LS 3.8L all cluster lights VIN: 2G4WB55K62
thanks to everyone who responded it was in fact the ignition guys are awesome and i am proud to be a member
2001 Cadillac Seville SLS 4.6L Poor Idle Quality VIN: 1G6KF57941
sorry for the delayed response. i replaced the iac motor and reflashed the ecm and vehicle is healed. thanks for all the help kevin [...] Trouble codes: P0506 (idle circuit low), P0507 (idle circuit high).
2003 Chevrolet Suburban 1500 LS 5.3L Rear vertical motor VIN: 3GNFK16Z23
Well, the owner has not returned with the "Home made" circuit board idea of Steve [...] from New Mexico so I can figure out the intermittenly problem with the seat. Contacting the owner and his reply was: "The seat is working all of the time, when it acts u...
2006 Chevrolet Trailblazer LS 4.2L door locks VIN: 1GNDS13S46
thanks for your replies, sorry it took so long to close but first liftgate module from dealer was used out of the box and had to wait for another one, but NEW one fixed it so im happy, also i did pull wiring harness in hinge area no broken wires or poor connec...
2002 GMC Envoy XL SLT 4.2L air suspension VIN: 1GKDT13S22
first of all I would like to say thank's to the five member that bother to reply, problem was the compressor with no compression, replaced compressor and everything went back to normal, and like one of the member suggested i'd sprayed fommy water over air bags...
2003 Saturn L300 3.0L vacum VIN: 1G8JW84R73
hay this one had a leaky intake gasket and it damaged the cat. as soon as you start driving up a hill the broken peices from the bank two cat. would clog the rear cat and start a wiseling noise from the intake. Bac k pressure test at idle was good. jacked up f...
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