iATN Member GM Auto Repair Tech Exchange for July 24, 2008

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Open Help Requests for GM

	Help Request	Answers
	1987 Chevrolet Corvette 5.7L instrument cluster It seems this is our week for blown bulbs in the instrument cluster. NOBODY locally seems to be able to find us the four little bulbs that illuminate the cluster on this '87 Vette. Jim Kidd Service Manager	View
	1988 Chevrolet S10 Blazer 2.8L engine hi I change the engine for a rebuilt one from a rebuilt shop.ihave got no vacum leak,collant sensor new, iac new, ignition module in distributor new, batterie new, starter rebuilt good power and good grownd. when engine is at normal temp, i turn the steering ...	View
	1997 Chevrolet Blazer 4.3L ABS Module Vehicle came in with codes C0261, right front wheel speed sensor or circuit. C0265 ECU malfunction. Cleaned the ground for the front speed sensor and fixed that. When checking for C0265, there was only 4 volts going to the ABS unit. Replaced the connector at t...	View
	1999 Chevrolet Monte Carlo 3.1L abs abs is activating on normal stops at hyway speeds there are no codes present and all speed sensers apaer to be reading the same acording to snap on scanner	View
	1999 Chevrolet Blazer 4.3L blend door Vehicle came in for climate control stuck on constant heat, found actuator reciving constant signal to go to full heat, Even in manual mode can not change actuator function, tested all temp sensors, power wire and grounds to actuator, even plugged in known goo...	View
	1999 Chevrolet Astro 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Poor Fuel Economy Vehicle has poor fuel economy, surge when driving. misfire at times. can not get the service lite to come on even tho unplug all sensors. problem occurs at anytime, hot or cold. problem intermittently. replaced .. fuel pump it fail prussure test, fuel filter...	View
	1999 Chevrolet Silverado 1500 4.3L Hesitation, Misfire, MIL Lamp on This truck is sluggish on accel. and misfires at cruise. Iv removed the fuel pump there was slimmy darkgreen stuff on the filter of the pump so I replaced fuel pump and cleaned gas tank. Truck still has 50 psi of fuel pressure at fuelrail and 65 psi at the lin... Trouble codes: p0300 (random misfire).	View
	2000 Chevrolet Impala 3.4L wipers The wipers will work on low or high intermittently but will not work in delay mode. When the wipers do not work the wiper motor will make a "hum" noise. Sometimes when in high or low mode they will stop at any location, and sometime when shut off the wipers wi...	View
	2002 Chevrolet Silverado 1500 4.3L Misfire, MIL Lamp on, Hard Start Came in with hard to start when sets overnightWhen I first checked it had codes for #5 & #6 mis-fire. We cleaned plugs & replaced wire set, Started & ran good with no miss. Let it set overnight & was hard to start when cold, but after start up it ran ok. On ro... Trouble codes: P300 (Mis-Fire Dected).	View
	2004 Chevrolet Silverado 1500 5.3L Windshield wipers Tranny guy trying to pay the rent here. Customer states that he can be driving down the road and the wipers will just come on. Has not happened to me. I have Shop Key, checked TSBs and found none. Wanted to check grounds but I am having trouble finding them. S...	View
	2005 Chevrolet Impala 3.4L No Start, no spark or injector pulse this car came on a hook customer said tha the day before if had stalled on him, hard but it restarted,took it home,next morning it woud not start. Checked,no spark and no injector pulse.crank and cam sensor had good signal so I checked igition module with vant...	View
	2006 Chevrolet Uplander 3.5L no crank Customer stated vehicle will not crank over after she has driven it and stops to go in store. She states it always starts fine in the morning when the vehicle is still cool. We found the vehicle does start fine after it has been sitting. Once it is heated up i... Trouble codes: U1000 (Class two serial communication error).	View
	1995 Geo Tracker 1.6L No Start Hello members!! I have a real stumper here. First time posting so bear with me. This 1995 Geo Tracker 1.6l automatic 4 wheel drive will not start. I have good fuel pressure and spark, but no injector break. We had the computer sent out to world auto parts for ...	View
	1994 GMC C1500 Suburban 5.7L Hesitation, rich on start up Hello to all once again. We have this GMC Suburban in the shop that is driving us nuts. On cold or cool starts it runs real rich if you tips into the gas. Black smoke coming out of exaust. We have checked and swaped (at customers request he has two of them) ma...	View
	2000 GMC Jimmy 4.3L Poor Idle Quality, Hesitation, Surge, Stall I have done the basic tune-up (plugs-wires-cap-rotor) replaced injectors, TPS , IAC , replaced fuel filter. Vehicle stalls, seems to be getting to much gas at idle, when cold. Once warmed up, vehicle does not respond to acceleration, stubbles, falls flat, and...	View
	2003 GMC Sierra 1500 4.3L temp at vents with ac on first start the truck will blow out cold air.after a 1or2 minutes it will start to blow hot air out the drivers side and middle vents.passenger side 2 vents stay blowing cold air.hope someone has run into this before.thanks for any help you can give...	View
	1989 Pontiac Firebird 5.0L Starting Hello and sorry for the bogus VIN. I am at posting from home about the Firebird that came in for a no-crank. I quickly realized that this car was not recieving a starter signal, and when applying 12 volts to the small purple signal wire, the engine turned over...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Buick Park Avenue 3.8L Drivers Vents Thanks for the info guys! Did an Evac. & recharge... All is well	18
	2003 Buick Rendezvous 3.4L Accessories Another nightmare fixed! - After finding the short that pops the fuse(see the update section below), we then found 2 light sockets that were wired wrong, which kept our interior lights on dim. How this happened we dont know. After all - it is a repo! Thanks f...	3
	1997 Chevrolet Camaro 5.7L blown head gasket Thanks to Neil for the help and Bill and everyone else who even answered. I dropped the subframe to put it back together. This is the only way to do it. I changed the cap and rotor, wires, plugs, radiator also, So I did more than average. you can do it in the ...	9
	1998 Chevrolet S10 2.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall well as the story goes DON"T OVER ANALYZE THINGS !!! ran truck on the motor vac machine this morning to eliminate fuel system.. truck still ran the same with no change...sooooo i increased the pressure on the motorvac to 80 psi and the front o2 only raised to ...	10
	2000 Chevrolet C3500 5.7L Poor Idle Quality I want too thank everyone for your help. Rule #1: "If it has electronic aftermarket equipment remove from system before perfoming any tests!" Rule #2: See Rule #1. I disconnected the propane controller and all readings came within spec. Truck ran great with o... Trouble codes: p0123b.	5
	2004 Chevrolet Astro 4.3L serpentine belt THANKS FOR EVERY ONES HELP ON THIS ONE, ADJUSTED P/S PULLEY OUT LIKE EVERY ONE SUGGESTED AND NOISE WENT AWAY, SPECIAL THANKS TO DENNY [...] FOR HIS TRICK WITH THE LONG SCREWDRIVER TO MOVE THE BELT IN OR OUT WHEN VEHICLE IS RUNNING. GREAT TO HAVE A PLACE LIK...	19
	2004 Chevrolet ROLL BACK 6.0L Hesitation, Surge, Cuts out, Stall, MIL Lamp on First of all I would like to thank all of you for your help.I receved a lost of infomation on how this system works,but most of all special thanks to JOE from Californa,THOMAS from Illinois on leading me in the right direction and giving me a phone number to c...	17
	1994 GMC K1500 5.7L No Start, Cuts out RIGHT ON!! Lots of comments about dist. but John and Herman hit it on the head. I took the dist. out and used a screwdriver and was able to turn the center peice of the pick-up coil. Replaced the dist with GM dist. and run like a top. Customer was super happy...	14
	2002 GMC Yukon Denali 6.0L ride control thanks for all the replies. I ended up taking it to the local gm shop to get the codes pulled with a tech2. my modis would not do it mr snapon??? ended up having a c0580 and I found the left rear shock damper solenoid shorted. some people said you have to disa...	3
	2005 GMC Yukon Denali 6.0L Unknown Well, As many had responded, it was the Left front wheel bearing/speed sensor. I have experianced a lot of problems on the older chevy trucks with bearing wear causing ABS problems, just nothing like this that actually engaged the ABS. I can only assume it is ...	10
	2001 Oldsmobile Aurora 3.5L Starting Car has not been repaired. 1 reply asked about a power saver-- too late. one was not utilized. Another reply stated something about an unlock code but did not elaborate. Called dealer they had no info on unlock code. We were able to bypass underhood starter re...	3
	2000 Pontiac Montana 3.4L fuel pump thanks for the quick response the problem was wiring harness on passenger side rocker panel had salt corrosion and had maelted together fuel pump gray wire to orange interior light wire.repaired wire all is good thanks	4

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