GM Automotive Technicians Technical Discussion and Fixes for Sep 26, 2008 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick LeSabre Custom 3.8L Cuts out, Stall, MIL Lamp on VIN: 1G4HP52L3R Hi all, we have one here that we are at a loss on. this vehicle will cut out (like the ign. has been turned off) and will store a crank/cam error code (and data) we have not been able to see what is going on. the spark seems steady, and the injector pulse is s... Trouble codes: P0341 (cam/crank error)	View
	1990 Chevrolet Corsica LT 3.1L No Start, Cuts out VIN: 1G1LT61TXL car towed in no start after fill up, starts and dies, checked codes none, fuel pressure good, checked ignition switch power at koeo - ok, checked fuel filter -plugged replaced -same, only checked resistance on #1 and #6 injectors - 12ohms as need to take plenu...	View
	1992 Chevrolet C1500 Cheyenne 5.7L Starting VIN: 2GCEC19KXN Hello friends, put a reman engine in this pickup. Cranks and starts but dies. Unplugged timing spout and it runs like a champ. Checked pickup coil, was bad, replaced, same problem. New ignition module. Wire is good from module to computer(423). What am i missi...	View
	1994 Chevrolet K1500 5.7L Stall VIN: 2GECK19K1R truck runs fine with o2 disconnected, connect o2 and system goes extremly rich. o2 readings up to 1000 mv. engine runs rough until finally stalls	View
	1995 Chevrolet K2500 Cheyenne 5.7L Poor Idle Quality, Stall VIN: 1GCGK29K1S have a strange one today,this truck stalls when you apply brakes.thought for sure we had a leaking vacuum booster. plugged off vacuum to booster same thing.unhook brake light switch and problem goes away.narrowed down to white wire going away from switch that ...	View
	1996 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Stall, Misfire, MIL Lamp on, RUNS RICH VIN: 2GCEC19R2T this p/u is driving us nuts...customer stated that all of a sudden vehicle started running poorly shortly after fill up ( coinsidence?) misfires piling up on 1,3,6,8...lots of black smoke and MIL on w/ MAP/MAF codes. after lots of testing and parts swapping wo... Trouble codes: P0101 (maf performance), P0108 (map voltage high), P1106 (map voltage int. high)	View
	1997 Chevrolet Express 3500 6.5L Excessive Emissions, black smoke VIN: 00V1088711 please help diesel tech and anybody with a word of wisdom! this is one of my better customers vans and have not really had a lot of experience with newer diesels! this one will blow huge clouds of black smoke when the van is driven above 40 mph on the highway ...	View
	1999 Chevrolet Venture 3.4L Cuts out, Stall VIN: 1GNDX03E3X Fellows I need HELP. 00 chevy venture 3.4 Every time you start off on the road and give it more than 50% tp. It will start to stall out bad and as long as you dont let up none on the gas it will do it for ever. You can go WOT and it will continue.If you let o...	View
	1999 Chevrolet K1500 Suburban 5.7L Misfire VIN: 3GNFK16R7X Hello fellow techs. I've got this Suburban that's giving me fits. Cust. complaint was ses light comes on, then goes off. Pulled codes & P0304 was stored. Check misfire data with mastertech. Was showing over 20,000 misfires on cyl # 4. Freeze data showed fuel t... Trouble codes: P0304	View
	2001 Chevrolet S10 4.3L Misfire VIN: 1GTCT19W11 Hi guys, This truck is driving me crazy, I'm loosing my hair I got left. I am working on this truck for shown severe misfire on cylinder 1 and 4 while no misfire felt. As soon as I run the engine over 1500 RPM the misfire data starts to show misfires on these... Trouble codes: P0300, P1380	View
	2001 Chevrolet Silverado 1500 5.3L Cuts out, Stall VIN: 2GCEK19T81 Hey guys, have this silverado that very intermittently stalls under load cruising 55 mph for 3-4 seconds and continues to run[no restart needed].It only happens occasionally[i drove it 40 miles ,and it stalled 1 time] I've wiggled and pulled every conn on the ...	View
	2006 Chevrolet Silverado 1500 LT 5.3L transfer case VIN: 2GCEK13Z26 when the transfer cese is in awd it seen to put a lot of load on the engine . we are also experincing a popping noise when shifting the transmission fron dr to rev or park to rev or dr . we have the transfer case out and apart and found nothing wrong . the flu...	View
	1996 GMC K1500 Sierra SL 6.5L Alternator VIN: 2GTEAK19S8 Hello Tecs - This truck is in for the 3rd time for an alternaor. First time around installed reman alt. new ign switch and 2 new batteries as one on the left side was crapped out. I installed extra ground on the left side as well, checked fusable links and tes...	View
	2002 GMC Savana 1500 5.7L daytime running lamps, fuel relay, starter relay VIN: 1GDFG15R12 towed in for no start condition. when key is turned, daytime running lamps dim or go out, no click, no starter relay, no fuel pump relay. daytime lights are on, dash warning lights on when key is off and out of cylinder. the dash bezel was removed and everythi...	View
	2002 GMC Cab & Chassis Sierra 3500 6.6L transmission VIN: 1GDHG31F82 have found that computer has no codes disconnect trans to try to set code and still no codes. install trans shift box (shafer shifter) trans works fine. checked all wires from computer to trans ohms and volt drop, no problems detected. checked power on pin e a...	View
	1997 Oldsmobile Aurora 4.0L no spark VIN: 1G3GR62CSW hello fello techs car has new cam and both crank sensors has current to module,.no spark.tried good known used module and coils .still no spark. help help please.	View
	2000 Pontiac Grand Am SE 2.4L Poor Idle Quality, idles high VIN: 1G2NF52T7Y starts to idle @3000 rpm and comes down to 1200rpm requested rpm 600 no visable vac leaks via smoke machine new intake manifold fuel regulator iac motor	View
	2001 Pontiac Grand Prix SE 3.8L Headlights &DIC When parked in shop stall,eng running and the headlamp switch in the off position.Then if you turn on the rear defogger or blower motor(speed 3 or 4) problem will happen sooner because of the increased load on the cicuit. Voltage at DIC/HVAC fuse is .25 volts...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Buick Skylark Custom 3.1L Cuts out, Stall VIN: 1G4NJ12M2T first of all i want to thank everyone for there help it ended up being a problem with the passkey system.customer took car to dealership to see if they can solve problem.kinda my fault i didn't check for the theft light illumination the light does not come on....	23
	1996 Buick Skylark Custom 3.1L prnd12 lights VIN: 1G4NJ52M6T THANKS FOR THE INFO IT WAS A BAD IPC FOUND USED UNIT.	7
	1999 Cadillac DeVille 4.6L steering VIN: 1G6KD54YOX well I ended dissassembling the pump & there it was, the vane housing had 1 broke piece causing it to hit. hard to beleive that that caused all that noise & vibration but considering how fast & how much pressure it makes perfect sense. Brian [...] hit the nail...	7
	1969 Chevrolet C-30 (?) 350CID cab VIN: CE53P82684 First, my thanks to everyone who has sent a reply--including some personal emails. I'm one-handed right now, waiting for hand surgery, so responses will have to wait. (Hunt-and-peck typing drives me nuts!). . . but will be forthcoming. Many members offere...	14
	1994 Chevrolet G30 Chevy Van 5.7L Master Cylinder VIN: 1GBGG39KOR Well it turns out I'm gonna hafta wait to know about the fix for this one... This is a camper van with lotsa goodie on it, extra fuel tanks, water holding tanks ect. our only drive up lift is on the blink & we can't lift it with our frame lifts so this one goe...	17
	1996 Chevrolet Monte Carlo Z34 3.4L Poor Idle Quality, Hesitation, Stall, Misfire VIN: 2G1WX12X5T Thanks for all the suggestions, not being a GM man i'm not familiar with common problems...Dave from Iowa was closest with vacuum leaks...Early on I had sprayed intake area with no change,but car had got worse with symptoms showing up every time after cold sta...	8
	1998 Chevrolet Blazer 4.3L transmission VIN: 1GNCT18W31 thanks for the help. Decided to take Rons advice and get a new used harness shipped in and all is well thamks again for aall the help.	3
	2000 Chevrolet Venture 3.4L fuel guage VIN: 1GNDU03E0Y slightly tapping on the bottom of the gas tank made the scanner reading go all over so we assumed the sender is bad. the customer didn't want to address this now. we also had a p0449 code and found a corroded power wire to the gas tak vent solenoid. The clue w...	11
	2001 Chevrolet Corvette 5.7L fuel gauge VIN: 1G1YY22G11 Sorry for the delay on the response. The Vette is fixed. Reflashed the computer and had the client run two bottles of Techron at two different tank fulls. Client states there are no more issues with the fuel gauge. I really appreciate the input from you techs....	13
	2002 Chevrolet Trailblazer LS 4.2L Accessories VIN: 1GNDT13SX2 Thanks everybody for your quick replies. I received many good ideas as to where to look for the source of this draw. Suggestions ranged from reflashing the theft deterrent module, checking the RAP relay circuit, the t-case motor, HVAC controls staying awake,...	6
	1994 Pontiac Grand Prix SE 3.4L abs VIN: 2G2WP522X4 Replace both front sensor harnesses, thanks to all for the help	7
	2002 Saturn L300 3.0L MIL Lamp on VIN: 1G8JW54R72 found the main ground on the front of the trans loose I had high restances on the ecm the ecm case is the ground for the ecm learned the hard way we installed a new throttle actuator any way i burned up 2 ecms doing this hole affair the first ecm lasted 200 mi... Trouble codes: P1516 (command vs throttle position correlation).	4
	2003 Saturn L300 3.0L pressures VIN: 1G8JW54R13 Sorry about the late close. I wound up replacing the compressor and all is well. Many thanks to all that replied.	8

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