GM Automotive Technicians Technical Discussion and Fixes for Nov 15, 2006

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Riviera 3.8L Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1G4GD2219S HELLO FELLOW TECHS . LOOKING FOR SOME HELP ON THIS RIVIERA. THE CAR HAS AN INTERMITTENT STALL OUT/SHAKE REAL BAD RUNS ROUGH. I HAVE LAB SCOPED MODULE/ PCM / CRANK SENSOR CAM SENSOR ALL SEEM TO HAVE GREAT SQUARE WAVE NO NOTICABLE DROP OUT OR SCREWY PATTERNS. HA...	View
	2002 Buick Century Custom 3.1L tcc VIN: 2G4WS52J32 Hey trans techs, Trans has hard shifts and chugs when slowing down and downshifting. TCC is staying locked. I know on some earlier models there was a screen in valve body plate that would come apart and stick in the TCC solenoid. Has any one seen any of these ...	View
	1995 Cadillac DeVille 4.6L MIL Lamp on VIN: 1DR235LGO9 what should the spec be any help would be great or is there a nother problem. thanks in advance Trouble codes: 085 (isc fault)	View
	1997 Cadillac Catera 3.0L control head VIN: W06VR52R6V this vehicles a/c heater control head is completely blank.Powers and grounds test good.looking for any ideas as we have had limited experience on this systems.thanks in advance for reading our post and any advice.	View
	1996 Chevrolet Blazer 4.3L heater core VIN: 1GNDT13W8T Repeat and rapid heater core failures (5 in 6 weeks). Started with Dexcool mud, which we flushed out. The last one installed 11/7 & failed 11/13! 3 cores ago we installed a ground wire from the radiator core to the upper radiator support and at the last core i...	View
	1997 Chevrolet Astro 4.3L Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDM19W4V Scope checked crank sensor and ignition module, both ok. Checked cat back pressure and its good. Fuel pressure is right on. Seems to be worse in damp weather but I cant find anything when spraying with water. What am I missing ? Trouble codes: P0300	View
	1998 Chevrolet Camaro Z28 5.7L Clutch VIN: 2G1FP22G2W Well Folks, this one is making us crazy. To give you some history, the customer came in with this vehicle after having it at a GM dealer for a clutch replacement. To make a very long story as brief as possible, they had forced the transmission into place and b...	View
	1998 Chevrolet Astro 4.3L Brakes VIN: 1GBDM19W3W Ok guys we are stumped on this one, maybe one of you guys have run into this before.. The truck came in for a pull to the right. We took it on a roadtest and found when you push the brake peddel down for a stop it pulls to the right but when you do a panic sto...	View
	1998 Chevrolet Tahoe LS 5.7L Stop Lamp VIN: 1GNEK13R9W I have a MIL P0719 for the stop lamp circuit. Stop lamps work good. Scanner says the switch is closed all the time when it should be open at least when the pedal is released. I checked the ppl wire output to VCM from the stop lamp switch and it reads correct ...	View
	1999 Chevrolet Cavalier 2.2L Steering VIN: 3G1JX544XS Hi all i have this cavalier that if driven for an extended period of time the power steering fluid will come out through the reservoir. It's as if pressure is pushing it out. Has anyone seen this before ?	View
	2001 Chevrolet Express 1500 5.7L Drivers Window VIN: 1GBFG15R31 Hi I have this van that came in with the drivers door window motor stuck down. After verifying power and ground to the motor when the switch is pressed I replaced the motor.It worked fine but came back the next day with the same problem.I discovered that the n...	View
	2001 Chevrolet Venture LS 3.4L power sliding door VIN: 1GNDXO3E91 Car came in for brake job. Did job and left. Customer calls back and says that since the brake job earlier, the Power sliding doors (PSD) don't work. Read checked fuses, ok. Performed reinitialization procedure in AllData. By pulling radio fuse for 30 seconds,...	View
	2002 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEK13Z82 this is a very intermittent problem. when it occurs it is usually from a cold start. it acts like a no fuel problem, but I have fuel pressure, injector pulse, and spark, finally it will start. when it does it acts like its comming out of a lean condition? once... Trouble codes: P0178, P0179	View
	2002 Chevrolet Impala LS 3.8L RF Wheel Speed Sensor VIN: 2G1WH55K72 Hello all, I have an Impala here I'm having some trouble with. The vehicle initially came in for an ABS and Trac light complaint. Also, the Traction Control would engage intermittently at low speeds and the ABS would also activate at times. Codes were set for ...	View
	2002 Chevrolet Impala 3.8L MIL Lamp on Hi folks, 2002 Impala LS 3800 seriesII. DTC P0410 Secondary AIR Injection Malfuntion. I ran the DTC on a Solus scanner and then performed an output test with a vacuum gauge T'd in to the exhaust valve. Pump runs, solenoid operated, valve opens, trims go up (1... Trouble codes: P0410 (Secondary AIR Injection Malfunction)	View
	2003 Chevrolet Silverado 2500 6.0L first gear only VIN: 1GCHC23U73 Hello, we have this 03 2500 with a 4l80e off warrenty [timed out]. We narrowed it down to only doing it in first gear. It sounds almost like a exhaust rattle noise. Very hollow sounding noise, does change pitch with speed change in first only. With the rear ti...	View
	2004 Chevrolet Silverado 3500 LT 6.6L goes into limp mode VIN: 1GCJK33224 i have this chevy come into my shop and had no power at all. looked up codes and found p0202 and p2149. i looked up the tsbs and found bulletin 06-06-04-026. it said if i had these two codes change out injector pigtails on clyinder 2 and 7 becuse of enginge vi... Trouble codes: P0202 (cylinder 2 - injector circuit problem), P2149 (inj position voltage control circuit group 2)	View
	1999 GMC Sierra 1500 SL 5.3L light on dash VIN: 2GTEK19T0X i guys this is my own truck and i am seeing service 4wd soon coming on the message center pretty often now. know at least 3 other trucks with the same light coming on. if its like everything else on this truck it is probley a common problen check with snapon s...	View
	2001 GMC Sierra 2500 HD SL 6.6L Cooling Systems VIN: 1GTHK2314F truck has a history of blowing coolant out thru reserve.cust kept adding water and it came out of it then came in and installed new t-stats.after which concern returned it builds excess pressure in system and blows off some if you open the cap it will blow off...	View
	2004 GMC Sierra 1500 SLE 5.3L Electric control VIN: 2GTEK19T84 Intermittently 4wd is inoperative. Sometimes control switch lights are not illuminated. Sometimes may show neutral or 4low, but is actually in 2hi. C0327 encoder code is usually stored in memory. Problem is intermittent and has not happened while vehicle has b...	View
	1996 Oldsmobile Bravada 4.3L fuel gage VIN: 1GHDT13W3T vehicle had no fuel pressure so we replaced fuel pump and vehicle started up. After we did the fuel pump the fuel gage stayed on empty. Our next step was to replace it again. Same problem I do not have any wiring diagrams for this vehicle. Please help	View
	1996 Oldsmobile Cutlass Ciera 3.1L Stall VIN: 1G3AJ55MXT After the engine warms up and is idling it stalls sitting in the shop in park or neutral. If it is brought just above idle the engine does not shut off. After engine dies it will fire up as soon as you turn the key, when it idles back down it stalls. Any ideas...	View
	1999 Oldsmobile Silhouette Premiere 3.4L sliding door VIN: 1GHDX03EXX hi guys I have another GM thatI can't figure out the sliding door will closed & open automatically with pillar & console swithches. but it will not respond with remote. when remote is press ligths will flash but door will not open. try both remotes makes no di...	View
	1990 Pontiac Grand Prix LE 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1G2WJ54T5L Hi I have a problem child. This 3.1 has a terrible idle and will get to the point where it will stall. I have checked the egr valve and even replaced with a known good one. Checked connectors for fuel injectors and they have the correct ohms. Fuel pressure is...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Buick Regal 3.1L 2-1 Shift VIN: 2G4WB54TOM Thanks for all the help, it looks like we will need to first try the modulator. Vacuum suply could also be part of the problem. I'm having a hard time geting the car back to look at it. But feel pretty sure after your help that the modulator will fix it. Tha...	12
	2001 Buick Century Custom 3.1L Stall VIN: 2G4WS52J01 well i have to say this is a first for me. i found that my fuel pump relay was shutting off in return shutting off my fuel. i hooked up meters to the power side and ground side of the relay and found those staying constant. amp meter on power and voltage drop ...	17
	1999 Cadillac DeVille 4.6L Compression VIN: 1G6KD54Y1X First thanks for all the replies. We took the original heads that where on the car when it came in and put and had them surfaced. Put them back on the vehicle and now we have 150Psi compression. I think we had bad heads supplied by the customer. Thanks agian. ...	11
	1989 Chevrolet S10 Blazer 4.3L radio, dome lights, dash lights VIN: 1GNCT1821K Well gang, There are TWO fuses for the dash lights, dome lights, horn and radio so I'm feeling kind of dumb about it. However, eventually the one would blow. Thanx to all who let me know where the ground was - above the e-brake pedal. This one was tight and ...	23
	1997 Chevrolet K1500 5.7L abs VIN: 1GCEK14R4V Installed Front Sensors,Cleaned Mounting Surface's. Same Problem. Belive It Is In The Controler. Customers Request Not To Replace. Disabled ABS Being Basicly A Plow truck Sorry	15
	1999 Chevrolet Express 3500 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCHG35R9X Since nothing was making sense on the readings I did go to the PCM which I was told by the dealer is not a big problem area, but sure enough there was corrsion in the PCM. Thank you for your help. Trouble codes: P0102, P0118, P0121, P0123, P0338, P1115.	11
	2003 Chevrolet Trailblazer North Face 4.2L head lights VIN: 1GNDT13S33 Thanks for the suggestions. I beleve the BCM is bad. We can not program the new module so we sent to our dealer.	6
	2005 Chevrolet Impala 3.4L cooling system VIN: 2G1WF52E2E Hey guys and gals.Thanks to all who took the time to help me out.Some times you have to stop yourself from making things harder then they have to be.Called the customer to get a little more info on the coolent recovery hose he replaced.Found out that it had be...	12
	1999 GMC Jimmy SL 4.3L long crank time cold VIN: 1GKDT13W1X I first tested for spark cold & when problem is occuring & spark was ok .Which led me back to fuel.I deadhead tested fuel pressure & got only 61 PSI. I even dedhead tested before the fuel filter 61 psi. This being a fairly new Advance auto fuel pump , I inspec...	19
	1996 Oldsmobile LSS 3.8L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1G3HY5217T thanks to all who replied about crank sensor.that was the problem.i tried testing the sensor with vantage but nothing would show uo so i replaced sensor anyway and problem was gone . Trouble codes: P0336.	5
	1999 Pontiac Grand Prix GTP 3.8L wipers VIN: 1G2WR5213X thanks for all the help I FOUND OUT THAT I HAD TO REPOSTION THE CAM, I THINK THAT THIS VEH WAS WORKED ON BEFORE W/ THE WIPER SYSTEM AND THEY NEVER POSTIONED IT THE RIGHT WAY	9
	2000 Saturn LW2 3.0L Starting VIN: 1G8JW82R3Y I just want to thank everyone that replied to my call for help. Sent the car to dealer, to reprogram vehicle. Still would not start. When manager called me, they had installed a bcm, and a pass lock module, still no start. I suggested a new key. Called later, ...	5

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