iATN Member GM Auto Repair Tech Exchange for April 30, 2008

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Open Help Requests for GM

	Help Request	Answers
	1999 Buick Regal 3.8L abs light used car lot vehicle. No history. Service vehicle soon, abs, & traction control lights on. Have car now to the point where lights stay off when car is started and they will not come back on until car is shifted from park to drive or reverse. If I go quickly fr...	View
	1999 Buick LeSabre 3.8L Stall Hello everyone, It will die at stops or at idle in park or in gear, it just shuts off. Otherwise it run great. 1st as a favor I replaced the crank sensor after hours for my friend because he said he already checked the basics... 2nd I saw the 18X and the 3X s...	View
	2005 Buick Rainier 4.2L lights & gauges we have two rainers the will intermitently loose gauges and the lights will dim. the charge gauge fluctuates. unfortunately it,s so intermittent we have not been able to duplicate to diaganose.the vehicles never die according to cust.then all of a sudden every...	View
	1994 Cadillac Seville 4.6L MIL Lamp on This is very low milage one owner car. It belongs to a 89 year old widow & it only gets driven once a week for about 6 miles. The only complaint is servce engine light is on with these 2 codes. Car runs great otherwise. She said it backfired yesterday 1 time. ... Trouble codes: P025 (24x Reference Signal Low), P041 (No Cam Signal From ICM).	View
	1999 Cadillac Escalade 5.7L Control Head After 20 to 30 minutes of drive time with AC on (AC button and recirc buttons pushed on and light up, compressor cycling) AC portion of control head fails, AC and recirc button LED's turn off , mode select air diverts to floor, compressor not running, (blitzed...	View
	2001 Cadillac DeVille 4.6L abs & traction lights Hey guys got a real stumper here. Another facility diagnosed this as a bad ECBM, customer brought this vehicle here with the paper work from a Cadillac dealer. We replaced the ECBM & flashed the ECBM. Now after all the programming we have codes C1248 EBCM Turn...	View
	1998 Chevrolet Suburban 5.7L vent tempature I need some advice here.When I checked the A/C out on this suburban It had no freon in the system due to a leaking compressor.I replaced the compressor with a brand new Delphi unit,drier and orphis tube.I added 8 0z of pag oil pulled a vacuum for 45 min and ch...	View
	1999 Chevrolet Blazer 4.3L Hesitation, Cuts out Hello fellow Techs. I have this Blazer that cuts out on accel. It does it only for a second and it is intermittent. No codes are present. has a new oem cap and rotor, plugs and wires. Fuel pressure over 60 psi on accel. I have monitored both the crank and cam ...	View
	2000 Chevrolet Venture 3.4L Hesitation, MIL Lamp on Good day fellow technicians, We are having trouble with this 2000 Venture. It has a symtom of fuel starvation under load. It runs great unless you accelerate and it struggles with fuel starvation. First visit for this problem, we replaced the fuel pump(delco) ...	View
	2001 Chevrolet Silverado 6.6L No Start The customer let his relatives from out of town borrow his truck. They stopped to refuel and put regular gas in the truck. I completly drained all fuel from the tank and wiped it dry. Put 9.5 gallons of diesel fuel and filled new filter with fuel. I have doubl...	View
	2003 Chevrolet Silverado 5.3L Hesitation, Misfire, MIL Lamp on This vehicle came in 3 months ago with a po300 and 420 code. We replaced the plugs and wires. Did an injector service. We also installed a new converter assembly. We checked the misfire monitor on the scantool and all looked well. Recently the customer came ba... Trouble codes: po420 (catalyst efficiency below threshold b1).	View
	2005 Chevrolet Equinox 3.4L Ignition switch cylinder Hello fellow techs, I need help. After performing a PA State safety inspection- vehicle need front brakes- installed- needed r/s headlight bulb- installed & changed oil & filter--- After test driving vehicle- pulled into parking spot & turned off ignition-- k...	View
	1995 Geo Prizm 1.8L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire Customer stated the vehicle died at a stop and would not restart. (Engine was cold) Was towed in. We had Spark, Fuel, Injector pulse. We pulled the Cap and found the Coil Contact Pin (on the inside of the cap),, was collapsed, and had not been making good cont...	View
	1996 GMC Pickup 6.5L Excessive Emissions This truck has pulled 5th wheel trailers since new,always lots of pull until recently. Only Generic code was PO106.Under hard pull black smoke blackouts the highway behind and loosing MPH and RPM's. The turbo cuts out at 2200 RPM & cuts back in at 2000 RPM whi... Trouble codes: PO106 (manifold absolute pressurebaromtric pressure circuit rangeperformance problem).	View
	1997 GMC Jimmy 4.3L MIL Lamp on Need help locating vent valve assembly Trouble codes: P0440 (evap problem).	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Cadillac DeVille 4.6L Suspension OK, I know everyone wants to hear this. I tried the following resistors and it did not work: 2.2 ohm 25watt, 10 ohm 25 watt, and a 16 ohm 10 watt from a suspension place, this one should work on the 98 up's supposedly. What did fix this car was a part calle...	4
	1993 Chevrolet Pickup 5.7L block thanks to Troy [...],Chad [...] and Joe [...] , they educated me in the fact that the rockers depended on the head style if i used head that had a round opening for the push rods to go through, i needed a rocker that had a slotted valve end (vortech) if the...	17
	2000 Chevrolet Venture 3.4L radio First and foremost, Thank You to everyone who responded with their suggestions. The customer purchased this vehicle from a relative and the relative still had a file on the vehicle and the code was written down. The previous owner saved the day! Thanks agai...	10
	2002 Chevrolet Malibu 3.1L 4-way switch found turn signal switch shorted internally. replaced switch. no more clicking noise. all lights ok.	3
	2002 Chevrolet Tahoe 5.3L Belt tensioner I would like to thank to all of you great thecnicias,the information that you provided to me about replacing the compresor,was very accurate,althoug i was not able to fix this 2002 chevrolet tahoe (the reason is that the owner left to ARIZONA State ,he works...	29
	2003 Chevrolet Venture 3.4L Poor Idle Quality, IDLES HIGH thanks guys for the quick response.tps was the problem on both vehicles.just had to wait for customer to respond back and let me know if vehicle was repaired.thanks again great help	6
	2003 Chevrolet Avalanche 5.3L suspension We have settled this animal down quite considerably with some new rubber! With a very bad shake like this we inspected and inspected the front end completely, shafts, u-joints, idler arms etc. None of these parts are worn, bent, damaged, or siezed. The tire...	16
	2004 Chevrolet Classic 2.2L No Start Thanks to everyone, for the great info. The customer has taken the car at this time. I will re-open at a later data if it comes back, and let you know the fix!	19
	2005 Chevrolet TrailBlazer 4.2L encoder motor sorry it took so long to close, but I found out the tcase had been replaced 60,000km ago and am still waiting to see if gm will cover it under warranty, I had drained the case and found it was burnt, had a buddy check the serial # , found out about all the wor...	11
	1995 Geo Prizm 1.8L Cuts out, Misfire After a big pain in the but. David from ontario hit it right on the head.aFTER MARKET COILS WONT WORK ON THESE CARS!!! Word of adviceyou can buy the coil cheaper from toyota than gm. Thanks for the help.	7
	1999 GMC Suburban 5.7L No Start Found that the fuel pressure wasn't enough.Replaced the pump and it started up.Found that the seal around the fuel spider was no good and replaced that also.Now the engine idles fine.Thanks guys you were a great help.	5
	2003 GMC Sierra 6.0L signals thanks for all the help upon further checking i found this truck has a signal module / flasher & replaced & worked great thanks again for the help PAUL.	6
	2003 Pontiac Grand Am 2.2L No Start, Stall, DUMPS FUEL thanks for all the input checked all sensors ok replaced o2 sensor original. when this is hapining scanner data is bogus in the mits of testing it started and ran fine for 45 min and all the # were good. turned it off 1 hr later same thing tested all powers &...	7
	2000 Saturn SL2 1.9L No Start Tom from Alberta - three ten minute cycles started vehicle. Initially when key turned on security light blinked four times then on steady, start / die security light blink four times. After the three cycles security light did not illuminate and vehicle started... Trouble codes: U1000 (Class 2 data loss), U1096 (Class 2 data loss with I.P. cluster), P1626 (Class 2 data loss), P1599 (Engine stall).	4

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