GM Automotive Technicians Technical Discussion and Fixes for Feb 19, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1999 Buick Century Custom 3.1L Excessive Emissions, Hesitation, Surge, Cuts out VIN: 2GWS52M1W1 Hello all, i've got this Buick thats giving me fits.The car runs perfect at idle but when you try to accelerate over 2500 rpm the car will hesitate,buck,backfire out the exhaust and never clear up.It almost acts as its hitting the rev limiter.The customer gutt...	View
	2002 Buick Rendezvous CX 3.4L blower motor VIN: 3G5DA03E32 Vehicle came in with a blower motor only working on "HI' speed. Found a bad blower motor resistor.Replaced resistor with dealer part, checked amp draw on the blower motor, maximum draw was 14 amps after 10 minutes of continuous operation. Let vehicle go.Return...	View
	2000 Cadillac DeVille DHS 4.6L Cuts out VIN: 1G6KE54YXY the problem i have is when cruising between 40 and 60mph it will buck now and agian. sometimes the ses light will come on with code po101. on the scanner right when this happens the injector pulse width goes high, my o2 sensors go rich, short term fuel trims g... Trouble codes: P0101	View
	2002 Cadillac DeVille 4.6L state insp failure VIN: 1G6KD54Y42 hello cady gurus i need a little help !! the codes indicate serial data line shorted to Bat + or no comm to several modules !! i scope the data buss term # 2 data link connector and pin 59 on pcm and get a sporadic square wave 0 to 7 + volt it shows a flat lin... Trouble codes: U1040 (loss ebc traction module), U1064, U1065, U1066, U, 1096 (loss of comm w/ipc), U1192	View
	1992 Chevrolet S10 Blazer 4.3L Start / Stall VIN: 1GNDT13W6N This 4.3 Engine Vin W. Has great fuel pressure 61psi great volume, Starts runs 2 seconds then stops. we have spark,Fuel pressure,injector pulse,battery voltage to fuel pump all the way till it's like it runs out of fuel. Egr valve is closed, Tps under a volt ....	View
	1993 Chevrolet K1500 Cheyenne 5.7L Cuts out VIN: 2GCEK19KOP Came in with intermittent chugging of the engine as if turning off the key and then back on then off etc... Of course the first thing we checked was the pickup coil and it was replaced just to be certain. No change. You can drive it without a problem and then ...	View
	1995 Chevrolet Camaro 3.4L Poor Idle Quality, Stall, HIGH IDLE VIN: 2G1FP22S6S vehicle came in a year or so ago and a new engine was installed and then the custoemr decided not to pay so the car sat for about a year now he wants to pay so we decided to fix it. after installation of all misc components to allow vehicle to be fully assembl... Trouble codes: 35 (high idle possible iac problem)	View
	2002 Chevrolet Trailblazer LS 4.2L Safety VIN: 1GNDT13S22 hello all! 1st i always seem to stuggle with u-codes argh.i have this vehicle with the air bag lite on constant all the time.it does flash the amounted times before comung on steady.i can comunicate with all the modules except the air bag.so i canot retrieve a...	View
	2005 Chevrolet Impala 3.4L Speedometer VIN: 2B1WF55E45 I don't know waht to check next.	View
	2002 Pontiac Grand Am GT 3.4L cruise control VIN: 1G2NV12E82 While driving down the road with the cruise engaged, it drops out intermittently. Also at times, the transmission goes into neutral at cruising speeds and then goes right back into gear. Also does this when not using cruise control. Also, sometimes when leavin...	View
	2000 Saturn SL2 1.9L no 4th gear VIN: 1G8ZK5274Y this is my sisters car. when she bought it it had no reverse. i found out in the archives about the input shaft nut being loose and tightened it. i put it all back together and reverse worked but shortly after there was no 4th gear. so i pulled the side cover ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2007 Buick LaCrosse CX 3.8L Headlights VIN: 2G4WD58227 Sorry for the long delay in posting this fix. I had to check with customer and see if they had driven this car at night after my repair. They report no problems now. So I am going to say it is fixed. The HDM was the bad guy. Never would have guessed it was a ...	10
	1997 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC124XV As many of you said it was timing chain and tensioner. I smoked for vacuum leaks and none found. I sent the car back to the previous garage and told them to recheck the timing chain. And they found it. This is why the vaccum was too low. I am not sure why they...	13
	2005 Chevrolet Trailblazer EXT LT 4.2L Differential VIN: 1GNDT13505 Thank you very much to all that have helped. I let the differential soak with pb blaster for about two days. Taking a peice of wood,a hammer and a prybar, i was able to rotate the diff while gently prying it out.	7
	2009 Chevrolet Silverado 1500 LT 5.3L brake controller VIN: 3GCEK23359 Thanks guys for the information. Most told me of the power wire between the underhood fuse box and left fender. It is taped back and has a eyelet. It needs too be attached to the larger stud coming out of the fuse box. There is also an accessory wire taped b...	11
	2004 GMC Sierra 1500 5.3L Misfire, MIL Lamp on VIN: 2GTEK13TX4 Thanks for all the help. I fixed the vehicle and it was the o2 sensor. I swapped both o2 sensor and it moved lean on bank 2. I replaced the o2 and plugs. Again thanks for all the helt. Mike Trouble codes: P0300 (Engine miss), P0171 (Lean Bank One), P0131 (HO2S Low Voltage Bank 1 Sensor 1).	19
	2003 Pontiac Grand Prix SE 3.1L dome lights VIN: 1G2WK52JX3 thanks all for help i found wire shorted going to pass side no problems yet.scan tool not read because simple bcm not hooked to data link.	8

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