GM Automotive Technicians Technical Discussion and Fixes for Feb 14, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick Roadmaster 5.7L Surge VIN: 1G4BN52P7R hello,this buick has a intermittant high idle that usually happens on a warm or hot engine and happens frequently.iac counts at idle start off normal at around 17 to 20.as you let the engine sit and idle iac counts will raise to 55 then to 70 then to 160 with ...	View
	1995 Buick Riviera 3.8L Low Pedal VIN: 1G4GD22K7S Vehicle was brought in three weeks ago with first half of brake pedal dead. I believe I jumped the gun when I told customer the master cylinder was bad. I installed new master, bench bled it, then bled wheels (I believe correct order was RR, LR, RF, LF.). perf...	View
	1990 Chevrolet Lumina Euro 3.1L Poor Idle Quality, Stall VIN: 2G1WN54T8L Hello everyone, this car will start to idle badly as soon as it achieves closed loop. I can watch the intergrator Numbers go all the way down to about 90 and stay there. I measured injector resistance on bank 1,3,5 was at 2.9ohms cold, 2,4,6 at 3.5ohms cold. f...	View
	1995 Chevrolet Camaro 3.4L Excessive Emissions VIN: 2G1FP22S2S Hi, This car failed state inspection test due to high nox. I disconnected the exhaust and the cat looks ok inside. I can energize all three solenoids on the egr valve. I do have battery voltage at terminal D. I can energize solenoid 3 and the engine almost die...	View
	1999 Chevrolet Tahoe 5.7L 2nd &4th Gear VIN: 36KEC16R4X This Tahoe will take off fine but when it should shift into 2nd gear it just stays in 1st but when you get enough speed it will shift into 3rd then stays in 3rd no matter how fast you go I have scanned this thing no codes. so when look at the data the computer...	View
	2000 Chevrolet Silverado 1500 5.3L No Start VIN: 1GCEC19TXY Customer claims that in the morning it start on first crank.	View
	2000 Chevrolet Astro 4.3L fuel gauge,abs lamp,oil gauge,mil,check gauges , VIN: 1GKMD19W1Y this 2000 astro van has the dash indicators all light up very intermittenly,oil,temp,fuel gauge all drop to 0. abs lamp on .the dtc's on the ipc were u1016 lost comm with ecm system , u1041 lost comm with ebcm system, u1064 lost comm with bcm system ,u1088 los...	View
	2002 Chevrolet Tracker 2.0L heater core VIN: 2CNBJ13C12 Hi group, again me with the same problem, but i have some news details. 18 months ago this Tracker came in our shop for the heater core leaking. The heater core have been replaced by another technician. Six month later the heater core leak again, another repla...	View
	2002 GMC Yukon Denali 6.0L pump VIN: 1GKFK66U52 A month after the service the customer stopped by and complained of a problem when backing out of his driveway. When he turns the wheels all the way it seems like something is binding, and when it is wet outside the symptoms are even worse, vehicle seems to "s...	View
	1997 Hummer H1 6.5L heater VIN: 137ZA9037V this vehicel had a heater core replaced (front) because it was leaking. following the replacement the customer returned with a complaint of no heat at idle. we inspected the flow of coolant through the rad and both heater cores, tested the thermostat, and inst...	View
	1995 Oldsmobile Aurora 4.0L Charging VIN: 1G3GR62CXS Olds came in with overcharge condition- going up to 17 volts, and a well cooked battery. Replaced battery and reman NAPA Alternator since regulator is in alternator, and surely with it apparently "full fielding" it had to have gotten hot. (Quite a job since it...	View
	1997 Oldsmobile Cutlass Supreme SL 3.1L anti-theft VIN: 1G3WH52M1V Hi Techs I got this car from the body shop. The steering colum was damaged trying to steal the car. They wanted there used colum installed. I did the install and the engine would not crank. I could jumper power to solenoid & would crank and start, also stay ru...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Buick LeSabre 3.8L Misfire I have not been able to fix this vehicle. it's my friends car and he don't have any money to buy any of the parts. many people have told me to replace the coil after i've wrote that spark did not move even though ignition coil have been flipped up side down. t...	40
	1992 Buick Park Avenue 3.8L PassKey VIN: 1G4CW53L2N All 29 replies were right on target with this one. The ignition key pellet reader was inoperative. The Radio shack resistors really did the trick though. Croping the wires under the dash and installing the resistors there was a great idea. Thanks to all that r...	29
	1997 Cadillac Seville STS 4.6L OBDII Monitors VIN: 1G6KY529XV Thanks for the info guys. I spoke to a tech from Cadillac. This car was Canadian, and when the new pcm was programmed it was from the vin so Canadian specs were used. This should not keep monitors from running. The tech told me it may take 100 to 130 drive cyc...	5
	1976 Chevrolet Corvette Stingray 5.7L engine performance VIN: 1Z3716S440 Most replies suggested readjusting the valves, checking the timing gear for correct alignment, and using another [...] streetable cam. I decided to not get in the middle with the engine builder and had the customer tow the car to builder. If I were to fix it, I...	55
	1994 Chevrolet S10 4.3L Entire System VIN: 1GCCS14Z5R I have this one fixed, for the most part. It ends up the ABS system wasn't working, and customer didn't want to pay to fix it. So, we bypassed the ABS modulator, making them sign that they know the ABS is not there anymore. We now have about 80% of what it sho...	22
	1995 Chevrolet Camaro 3.4L Excessive Emissions, MIL Lamp on VIN: 2G1FP32SXS Many thanks to those that have posted replies. The customer has yet to return the vehicle to me at this time. I have been in contact with her though and we are planning a good time for her to return it to the shop. I am going to remove the intake and the egr r... Trouble codes: 77 (Digital EGR 3 Solenoid Error).	15
	2001 Chevrolet Silverado 1500 4.3L No Start VIN: 2GCEC19W21 ok guys we finally fixed this one, after the third computer we disconnected fuel pump, and hooked up a fuel care machine, and vehicle started and ran, the fuel pump even though it had fuel pressure was burning out the injector module wich was giving us no grou...	21
	2002 Chevrolet Impala 3.8L hazard switch VIN: 2G1WF52E92 thanks to all who offered there help we are stiil working on the problem we will notify everyone on the fix when it happens.all sugestions were of great help.	6
	1996 Saturn SL2 1.9L Coolant VIN: 1G8ZJ5275T The fix for this Saturn was to replace the coolant sensor. I was using my scanner read the coolant temperature (while my inferred thermometer gathered dust on my tool box). My scanner seemed to correspond to the Saturn's temperature gauge. I am sorry to say it...	12

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