iATN Member GM Auto Repair Tech Exchange for June 18, 2008

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Open Help Requests for GM

	Help Request	Answers
	1999 Cadillac Seville 4.6L Poor Idle Quality, Hesitation, Cuts out, Misfire hey everyone i have a 99 seville sts came in with a po300 randome misfire and a po741 tcc stuck off this car backfires through the intake and runs terrible dont do much on transmissions but can this misfire code and the way it runs set the trans code if drove ... Trouble codes: po300 (random misfire), po741 (torque converter solenoid).	View
	2002 Cadillac Seville 4.6L Engine This vehicle had and still has four cylinders not working since the beginning. Owner requested an engine overhaul which did not correct his problem, thus fat 1,3,5,7 cylinders continue to not work. Cadillac flashed new calibration for the PCM , and still the v...	View
	1984 Chevrolet Corvette 5.7L digital dash Hi Corvette guys, I have an 84 vette in the garage with a defective digital dash. Actually everything works ok except two functions. The tach display left side works however the 2 digit tach readout flickers along with the stationary green yellow and red line...	View
	1986 Chevrolet Corvette 5.7L battery Thanks in advance for your help. This my first help request, I'll do my best. Car came from other shop with supposed second battery replacement in a few weeks. Battery needed jump start. We charged and tested battery. It is weak. We let car sit over night and ...	View
	1997 Chevrolet Pickup 5.7L MIL Lamp on this is my personal vehicle.driving one day,running great.started stalling at stops and hesitating badly.did this for about ten miles then parked.later when restarted hesitated badly,floored it to get across intersection.did not stall anymore.now check engine ... Trouble codes: 172 (too richbank 1), 175 (too richbank 2).	View
	1999 Chevrolet Malibu 3.1L Poor Idle Quality, Poor Fuel Economy Customer complained of loss of power and a bucking under load,and excessive fuel usage. Knock sensor activating and retarding timing. Disconnect knock sensor, Retest, power good now has a spark knock under load. Check datastream LTFT at idle -10 or more. Pulle...	View
	2002 Chevrolet Silverado 6.6L No Start, Poor Idle Quality Hello Group, I have ended up having to sweep up everybodys mess again. This truck had a no start fault the AA towed it to our local GM dealer they rang the owner[who was on his trip home in the recovery truck] and told him that the truck was now running and th...	View
	2003 Chevrolet Impala 3.4L No Start Would not command ac compressor on replaced control head still the same problem replaced body control module when programing the (BCM) module we lost communication with the PCM. Then vehicle would not crank put in a used pcm, Tech 2 would comunicate but would ...	View
	2003 Chevrolet Impala 3.8L abs module Hey Guys, This little Chev showed up with the abs and traction-control lights on all the time. Had a code 1233--rt ft speed sensor. We replaced the hub, and the wheel sensor is now putting out a speed equal to the other three sensors--according to scanner data...	View
	2003 Chevrolet Express 6.0L ABS Module Vehicle came into shop for normal PM and ABS and Brake light illuminated. I was called in as the shop could not get scan data on their scanner. Van is equipped with GPS unit. Unit had to be removed to access data and codes. When scanning for codes, only code r...	View
	2006 Chevrolet Uplander 3.9L Accessories Am looking for info on the brake signal wire to be used for a trailer brake controller. I talked to parts guys @ dealer and they say it should have two studs & two wires @ fuse panel for controller 'takeoffs'. I called a tech from dealer who searched diagrams ...	View
	1992 GMC Rally 5.7L Poor Idle Quality, Cuts out, Stall vehicle came with intermintant engine dieing at idle and you can watch tach drop out 2 to 3 hundred rpm . it happens only when hot and the tach drop out is more constant than the stalling ive only got it to stall once . when i put scanner on it the idle raise ...	View
	1995 Pontiac Grand Am 2.3L Rear Brakes Have had this problem on other vehicles and a new set of shoes has fixed it, but this one won,t go away. when vehicle has sat overnight and it rains or is damp out the first couple brake applications lock the rear brakes. I first replaced the shoes and the pro...	View
	2001 Pontiac Montana 3.4L Stall good day to you this van came here after many previous repair shops tied to repair.the stallstarted 3 months after the intake gaskets were replaced.the iac motor and tps were replaced by the first shop but it still stalls when it stalls you are sitting at a li...	View
	2004 Saturn Ion Red Line 2.0L performance upgrade i have a customer who wantsto install nitrous on this car.the problem is it has an electronic throttle.where can i get a high voltage reference for wot operation of the system.he doesn't want to put a push button on it.thanks for any help chris	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1993 Buick LeSabre 3.8L compressor clutch Well, after getting a little un-interrupted time early this morning to really study this system I realized that the a/c request signal from the hvac controller has to go through the high pressure cutout switch on the compressor, then through the clutch cycling...	4
	1993 Buick Park Avenue 3.8L MIL Lamp on there were several thoughtful replies. joe got me in the right direction when he suggested the boost solenoid as a likely suspect. after more testing i found the boost solenoid would fail with heat. after driving the thing would warm up and go OL. i missed it ... Trouble codes: 56 (qdm b).	7
	1987 Chevrolet Pickup 5.7L fuel gauge Thank you guys for the wiring diagrams. I had a rubbed wire that was shorted out. So it was intermittantly blowing fuses. thank you again.	4
	1994 Chevrolet S10 Pickup 4.3L knock You guys Freaking rock! All that said the torsion bar mount were dead on. I could see the crack as soon as i saw the silly thing. Replaced it in 30 minutes and the customer was off. THANKS AGAIN!	22
	1996 Chevrolet Monte Carlo 3.1L Poor Idle Quality, Stall Thanks to all who replied I felt a little brain fade on this one as most of you said a problem in the fuel pump area .I had decent volume but low pressure .This car would run fine wot and cruising thats where I got off track ,I'm so used to seeing no starts r...	19
	2001 Chevrolet Blazer 4.3L Surge, Cuts out well i took the blazer to a friend of mine.he is a transmission guy .he hooked it to his scanner and we could see the converter slipping while it was acting up.thanks to all who replied ken [...]	6
	2004 Chevrolet TrailBlazer 4.2L MIL Lamp on This vehicle came in with a check engine light on and hard to fill with gas. I replaced the canister vent valve that took care of the light, and as some of you said there is an updated fill tube for the hard to fill problem we installed that and now everythin... Trouble codes: P0455 (Large Leak Detected).	7
	2002 GMC Yukon XL 5.3L Misfire, MIL Lamp on Hello guys, Thanks for all the help! Steve was right on! I swaped the two front O2's and fuel trims on bank one went crazy. They were actually close on both banks with the O2's in their original location. I did notice that bank two would Max out at 1102 mv ... Trouble codes: P0306 (6 cyl misfire), P0300 (random misfire).	13
	1996 Oldsmobile Achieva 3.1L No Start, Stall Turned out to be a bad IPC. Replaced the IPC with no further problems. Trouble codes: p1573 (Lost Communications with BrakeTraction Control EBTCM System), p1629 (Theft Deterrent Fuel Enable Signal Not Received).	14
	1988 Pontiac Grand Prix 2.8L Misfire first thanks to all that replied, the fix was that i had a bad coil and module all at once, butt ended up getting a bad new coil in the process, got a good one and all is well. thanks again	8
	1992 Saturn SC 1.9L Poor Idle Quality, MIL Lamp on The coolant temp sensor fixed the rich condition but the egr and purge solenoids was not the cause off the check engine light not that it mattered the customer was happy to have the car running good he didn't care about the light at this time. Thanks Chris Trouble codes: 26 (Quad driver B fault).	10

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