GM Automotive Technicians Technical Discussion and Fixes for Apr 11, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality VIN: 2GCEC19K8R This chevy pick-up came for a rough idle condition on cold start. we performed a computer scan and found no codes in memory. the customer left the vehicle overnight to allow us to see the problem. on cold start, the engine will run very rough and will misfire ...	View
	1996 Chevrolet Blazer 4.3L turning VIN: 1GNDT13WOT this blazer came in for a grinding noise. checked brakes and they looked good, however, the sway bar on the driver's side is contacting the inside of the rim when wheel is turned all the way to the right. the idler arm had lots of play, so we replaced it. no h...	View
	1996 Chevrolet Lumina 3.1L Poor Idle Quality VIN: 2G1WL52M1T the 96 lumina has a high idle problem. start up 1500 rpm thenmaybe drop to 1200. 1200rpm is the lowest it will run.when the engine get to 212f and the fans kick on iac motor up 1350rpm and when the fans shut off idle stays at 1350 or goes higher 1400rpm.if you...	View
	1996 Chevrolet Astro 4.3L Intake manifold VIN: 1GNEL19W8T We did a water pump on this car 4 months ago and now its back with a coolant leak that appears to be at the intake manifold gasket on the drivers side. The motor is a 4.3 litre. I checked for a blown head gasket and it seems O.K. (no HC's in the radiator). Bef...	View
	1998 Chevrolet S10 2.2L service engine lt & running lights VIN: 1GCCS1448W vehicle came in with customer stating running lights would not shut off when key off and out. we disconnected the battery & let it set. rehooked battery & all is well until we ran it for about 15 minutes. when we shut the key off the engine jumped a little and...	View
	1999 Chevrolet Malibu 3.1L Poor Idle Quality, Misfire VIN: 1G1ND52J1X Hi Techs, 1999 Malibu 3.1L came in with an intermittant misfire at idle. Mifire is between 800 rpm up to 1800 rpm then she hits all cylinders. Below 800 rpm idle is smooth. Above 1800 (approx.) she runs smooth with all cylinders online. Good acceleration witho...	View
	1999 Chevrolet Silverado 1500 5.3L No Start, Stall VIN: 1GCEK19T5X truck came from another shop on the hook. it will start and stall. it last about 3 seconds. other shop has replaced fuel pump& reg. i called the dealer with vin # to see if it was equiped with theft deterant. they said not. there is no security lite on instrum...	View
	1999 Chevrolet Venture 3.4L head gaskets VIN: 1GMDXO3V5X hello techs. we have a new customer with an off warranty van and has just noticed a the sweet smell and some dripping of coolant, never overheated. the dealers quote is for new head gaskets and a water pump. pressure tested myself and have done this intake job...	View
	1999 Chevrolet Astro 4.3L Spider Gears VIN: 1GNDM19W2X Have not worked on any Astro's or Safari's except in replacement of many distributor caps. Vehicle has no decs or accidents. Family that owns this vehicle has 3 Astro's all with same problem. Spider Gear has chipped teeth but no evidence of missing part of too...	View
	2002 Chevrolet Venture 3.4L Front Brake Caliper VIN: 1GNDU23E22 Hello This one is great. We did a (what was supposed to be simple) brake job. New pads, lube calipers, reface rotors. Two weeks later customer came in complaining of clicking noise in front when braking. We relubed calipers and noise was gone, but only for a w...	View
	2003 Chevrolet Suburban 1500 LS 5.3L electric windows hello all. this truck came in with driver's front & rear wdo inop. checked power & grounds to master switch, o.k. tested motors, o.k. replaced master switch, all windows worked fine. customer returned 10 minutes after leaving w/ both left side windows inop. ag...	View
	2004 Chevrolet Tahoe LS 5.3L Tire Pressure Sensors VIN: 1GNEK13Z14 Fun one. This customer wanted aftermarket wheels and tires installed on this truck... Great, something we do daily easy stuff right? NOT this truck has tire pressure sensors and they will not fit into the aftermarket rims... SOOOOO my question is can this syst...	View
	1996 GMC Topkick 7.0L Auxiliary Brakes VIN: 1GDL7H1M6T Hi Everyone, We normally don't do trucks this size, but customer came in with no brake pedal complaint. We replaced the master cylinder and flushed the brake fluid and the brake pedal came back. A problem was then found with the left rear caliper so we had th...	View
	2003 GMC Envoy XL SLE 4.2L Accessories VIN: 1GKET16SX3 has anyone seen or is anyone familier with this vech loosing the power windows and door locks. the air bag light also comes on sometimes. just wondering if this is common. i am going to be looking into this tonight. thanks all	View
	1995 Pontiac Bonneville SE 3.8L keyless entry VIN: 1G2HX52KXS In 1999 we installed a GM keyless entry package for this customer. Now one of the remotes is worn out. We were able to track down and purchase new remotes for him, however, the programming procedure is not accurate due to the fact that it is not factory instal...	View
	1996 Pontiac Grand Prix SE 3.1L cooling fan VIN: 1G2WJ12M3T Thanks for any help in advance folks. The car came to me running a temp of 220. The cooling fan was not kicking on. I turned on the A/C and the fan would run from time to time. But it was weak. I replaced the right side fan with one from a salvage yard. & also...	View
	1998 Pontiac Trans Sport Montana 3.4L power sliding door VIN: 1GMDX03E5W This montana with passenger side power sliding door closes just about all the way and then re-opens. I saw a fix in the archives for re-initializing the door. My question then would be, what is that procedure and where do I find it ?	View
	1994 Saturn SL 1.9L Surge VIN: 1G8ZF5594R When car warms up to operating temp the car misfires at low speed around 1500 rpms and u can unhook the egr valve and the misfire stops .Also checked for carbon buildup but everything looked good and according to my scanner the egr solenoid is working fine .	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Cadillac Eldorado ETC 4.6L trunk release and fuel door release VIN: 1G6ET1294V i found the problem to be the vallet switch in the glove box replaced it and it has been fine since thanks for all the help	5
	2000 Cadillac Catera 3.0L Misfire VIN: W06VR53RSY Hi : I did not mention I also have a 'secondary air injection incorrect flow' code don't know if it is related to the missing problems,however,I unplug the both front O2 sensors and runs the engine long enough and the miss never happened.This car is from the...	11
	1988 Chevrolet G30 Hi-Cube 5.7L No down shift VIN: 2GBHG31K0J Oh boy people! IATN is a great service but as of late I've seen a lot of stuff that isn't good. I read a Volvo post the other day that someone replied that the tech. needs to change jobs and be in politics and called him a goof. Whats wrong with some of these ...	21
	1994 Chevrolet C2500 Suburban 5.7L Poor Idle Quality, Misfire VIN: 1GNGC26K5R This one ended up being intake gasket on port #2 external leak. I feel so laim for not finding it sooner but at least its gone. Thanks to everone especially about how to ck for vacuum in the crankcase, a very usefull tip that I will not forget. The Gasket actu...	19
	1995 Chevrolet S10 LS 2.2L Poor Idle Quality, Misfire VIN: 1GCCS1940S thanks for all the help. there were autolite spark plugs installed at the other repair shop.replaced them with ac delco plugs and it flew through with flying colors.theres something to be said about factory parts.	5
	1996 Chevrolet Camaro Z28 5.7L Spark Knock VIN: 2G1FP22P6T We got several replies to this help request. However, none hit the nail exactly. Since this was a newly overhauled motor, the EGR system was completely clean and the knock sensor had been replaced with a new GM unit. The wiring to the knock sensor and the EGR ...	20
	1998 Chevrolet K1500 Cheyenne 5.0L Misfire, MIL Lamp on, cylinder 5 VIN: 1GCEK19MOW Thanks to all that replied. Sorry its taken so long for a reply, It turned out to be a bad intake gasket. We got it all back together and had a misfire on cyl 7, that was another bad injector Trouble codes: 305 (cylinder number 5 misfire).	21
	1999 Chevrolet Blazer 4.3L blower speeds VIN: 1GNDT13W7X first of all thank you all for your fast replies. this system is a automatic system, it uses a power module by the blower module and the control head module. the blower module has five wires, 12 volts feeding the blower, and ground side regulating blower speed...	7
	2000 Chevrolet Venture 3.4L Rev. and drive engagement VIN: 1GNDX03E1Y Well, I finally got the van to act up for me tonight, but I was at home and didn't have any diagnostic equiptment handy! I pulled it into reverse nothing there, just like she said. The rev. indicator light in the dash was lite up like it should be, I bumped th...	9
	2002 Chevrolet Trailblazer LS 4.2L Mechanical VIN: 1GNDT13S62 We received eleven replies to this post. Almost all said the noise in these engines are normal. After going to thr local GM dealer and listening to the used vehicles on his lot with this engine, they all sound the same. The customer decided to go no further at...	11
	1995 Pontiac Grand Am GT 3.1L brake lights VIN: 1G2NW55M1S thanks to all who took the time to help us.the combo switch,ie. turn signal switch was defective.all of the wiring tips,pin out checks,and advice was on the money.this was my first post and i got 25 replies.i have been working on toyota's from back in the 80's...	25
	1999 Pontiac Grand Am SE 3.4L headlights VIN: 1G2NE12EXX Well i got alot of replies but the vehicle is still not fixed.I had to put it to side for now because of other things.If i do fix it i will try to post information later.Thanks for the help!	15

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