iATN Member GM Auto Repair Tech Exchange for June 5, 2008

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Open Help Requests for GM

	Help Request	Answers
	1997 Cadillac Eldorado 4.6L MIL Lamp on Hey All,WE have this Eldo with lean bank 2 lt fuel trim is 20% @ idle bank 1 is 9% @ idle.Check with smoke machine for vacuum leak and with propane none found.Also flushed fuel injectors with no help.Did injector balance test all test good.Any ideas? Thanks in... Trouble codes: p0174 (lean bank 2).	View
	2002 Cadillac Seville 4.6L blower motor thanks in advance, this cadillac came in with the blower motor inop. customer said it gave no warning, it just quit. checked for power and ground to the blower motor. Has 14v on power wire and 6 volts on ground wire. then checked power and ground to the blower...	View
	1987 Chevrolet Pickup 5.7L fuel gauge I have a problem with the ecm fuse blowing when I try to switch to the right tank. I have the brown and white wire tied to the gray wire on the right tank pump assembly. So in other words the left tank power supply is used to power the right tank. Is there som...	View
	1999 Chevrolet Silverado 6.0L 4x4 Hi Guys, This one is killing me. I got this Silverado at auction. The 4X4 switch will light up all the lights or none at all. If I turn the key on and off a few times I can get all the lights on the switch to light up at the same time. When I turn the key on t...	View
	2000 Chevrolet Monte Carlo 3.8L compressor Hi, I have a chevy Monte Carlo with no A/C. The problem is comp. is not receiving power. I checked all voltage at fuses and relay and all ok. Except the PCM is not grounding a/c relay. If I jump relay comp works fine and a/c pressures are fine. Scanner shows ...	View
	2003 Chevrolet Malibu 3.1L AC Compressor Hello, thnaks in advance for your help. 2003 Malibu with the 3100 SFI. I replaced the AC compressor because it was leaking, AC system was working fine besides that. 3 reman compressors that I have put in, keep blowing the fuse. It starts drawing between 6 and ...	View
	2004 Chevrolet Venture 3.4L water in floor customer has been coming in for 2yrs now and is complaining of water getting under the carpet and saturating the floor on the drivers floor board,this is only occuring when it is a/c season so we felt it had to be related to the a/c but yet we are seeing no si...	View
	2005 Chevrolet Express 6.0L Poor Idle Quality, Hesitation, Surge, Misfire, MIL Lamp on Well this vehicle come to me after many trips to the dealer and a private goodyear repair center. It is from a fleet that i serviced for many years only to loose the account several years ago. They bought this back to me as a last resort and I am hoping that I... Trouble codes: p0103 (mass airflow circuit high), p0174 (system lean bank 2), p0300 (random missfire), p0356 (ignition coil f primary circuit).	View
	2007 Chevrolet Impala 3.5L tire wear Don't like to use this method for this problem, but I need to align this car today and can't find the front and rear alignment specs. Can someone tell me what they are? your help ia much appeciated. Deck	View
	1996 Geo Tracker 1.6L MIL Lamp on i have tested everything and replaced egr , transducer filter, tested the map sensor tested the solenoid, and vaccum solenoid with a filter on top. everything tested good. this is a very good customer of mine and would like to keep them happy . need help Trouble codes: PO400 (egr valve flow malfunction).	View
	2002 GMC Sierra 6.6L No Start, Stall, Blows ECM-B fuse Hello Duramax tech's, I had a road service call yesterday for a stalled out duramax truck. This truck was towing a small backhoe and had about two tons of dirt in the bed when it stalled under full power going up hill. My customer stated it seemed low on powe... Trouble codes: None (None).	View
	2004 GMC Envoy 4.2L radio Hello Group, As listed in the related repair history, my intial repair concern was to clear the "locked" message on the radio. I did this with my tech2. The locked message is gone but there is no sound from the replacement unit. This is affecting the audio me...	View
	2006 GMC Sierra 6.0L ABS Motor Thanks for your help in this matter. This vehicle has a brake fluid leak coming from the ABS controller, located midway under the vehicle .My question is if I replace the ABS unit is there any special procedure necessary to bleed the system other than my power...	View
	2000 Oldsmobile Intrigue 3.5L temp guage car came in with erratic temp readings, we changed thermostat and flushed the system. now temp is stable but customer noticed when using heater the temp guage travels to a high point almost at redline. we verified and checked engine temp that was normal. after...	View
	2004 Pontiac Grand Am 2.2L Safety This Grand am has had a problem ever since we installed a clutch and slave cyl. The transmission goes into reverse hard and the key will come out of the ignition all the time (only supposed to come out when vehicle is in reverse). There is also a constant clic...	View
	2001 Saturn L300 3.0L No Start Towed in by owner, crank no start, can here fire and sounds like no injecter pulse. Can see no rpm on tach or on scanner when turned over.TPS voltage at 1.17v at closed throttle.TPS % shows 15 at closed thro and 99 at wot.App 1 voltage is .41 at closed throt a... Trouble codes: P0463 (fuel level snsr ckt signal), P0453 (evap pres sign high or open), P0123 (tp or app 1 ckt open or high), P0122 (tp or app sens 2 short or low), P0123 (tp or app 1 ckt open or high).	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2001 Chevrolet S10 Pickup 2.2L MIL Lamp on As most of you know, it is always good buisiness practice to try and gather as much info as we can before and during diagnostics of the modern automobile. The truck came in my shop and we did an initial inspection of the problem found with the understanding th... Trouble codes: po420 (catylitic efficiency).	9
	1998 GMC Jimmy 4.3L o2 sensor bank 1 Ahoy!! Another easy fix after looking into the problem. I did not connect one of the grounds at the back of the engine. Finding the issue was easy connecting that ground wire was certainly not.	8
	2005 GMC Yukon 6.0L Steering steering gear fixed the problem... thank you for help...	13
	1997 Pontiac Grand Prix 3.8L No Start I don't understand this at all but the vehicle is fixed. First I should apologize. I got a ton of replies on this and almost all said crank sensor or wiring to. I said I had scoped the cam and crank and had good pattern in to ICM. I dismissed all replies becau... Trouble codes: PO336 (crank position performance).	13
	2002 Pontiac Grand Prix 3.8L abs communication First thing I did was take the car to the dealer, the tech 2 communicated and we were able to see a speed differance to the left front. As stated in the tsb that was brought to my attn. and by the advice of the dealer tech I removed LF wiring harness and found...	2
	1993 Saturn SL2 1.9L No Start I couldn't beleive it, Temp. sensor that was a first for me and most of you hit the nail on the head, thank you all.	13
	2001 Saturn SC1 1.9L fuse box several replies said just wire a relay around outside of box. One reply gave me good idea of how box was acually put togather. after wiggling relay and fuses for fuel pump we were never able to duplicate problem. customer kn...	6

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