GM Automotive Technicians Technical Discussion and Fixes for Jul 7, 2009 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Park Avenue Ultra 3.8L unknown VIN: 1G4CU5219S Loud Extreme pop noise occurs at random usually only once each time vehicle is driven and parked a few hours -- sounds like a small rock hitting winshield. May be plastic of dash ? some item in dash ? Prefer Buick tech responce or someone who has fixed one for...	View
	1966 Cadillac CoupeDeVille 429CID Auto Climate Control Come on you OLD Cadi experts help me out PLEASE!!!	View
	1998 Cadillac Eldorado ETC 4.6L Car runs great VIN: 1G6ET1291W This Caddy has me on my last nerve, I got a continuing PO440 code. Smoked engine, lines to tank and both purge and vent valves. I have Vaccum in the port and activated it with my scanner to verify they are working. I'm at a lost right now. Trouble codes: P0440	View
	2003 Cadillac DeVille 4.6L ecm/icm VIN: 1G6KD54Y93 please help !!! car was towed in from another shop where it was for thee weeks .car stalled and would not restart . they said they replaced a wiring harness and a fuel pump and thats all the info. that i have on that repair...the car will crank i have fuel pre...	View
	1993 Chevrolet K1500 Suburban Silverado 5.7L Hesitation VIN: 1GNFK16K3P Customer brought this truck in, it has no power at all, can't get out of third gear, won't rev up very well. Undriveable. I unplugged the EGR control solenoid and the truck seems to drive fine, i;ve searched and found people saying to replace both EGR valve ...	View
	1995 Chevrolet Blazer 4.3L No Start, Misfire VIN: 1GNCT18W4S Hi GM techs, I really need you assistance on this one. I purchased this Blazer as a partially completed repair. The original 4.3 was missing and a 1994 4.3 was bolted in place. The prior owner indicated that the 1994 engine was not compatible as it was not equ...	View
	1997 Chevrolet Blazer 4.3L Misfire I have a 1997 chev blazer that will not fire on all cyl. It has anew ign. switch, plugs, a new fuel filter, new cap and rotor. A NEW GRK SENSOR AND CAM SENSOR installed by some one else.	View
	1999 Chevrolet Monte Carlo Indianapolis 500 Pace Car 3.8L Excessive Emissions, Stall VIN: 2G1WX12K6X vehicle starts and runs fine for about 15 min. afterwards the vehicle bellows out black smoke out the tail pipes. scanned car, vehicle has no codes. during warm up all scan data o.k. ect, switch's from open loop to closed loop, o2's switching rich\lean, map an...	View
	2001 Chevrolet Monte Carlo SS 3.8L no crank VIN: 2G1WX15K31 the body module numbler is [...]. it's lower than the new numbler of update. if you turn the key to crank. all the dash light go blank only service engine soon light on. if you release the key. it's dash light normal again. also found the battery terminal c...	View
	2004 Chevrolet Silverado 1500 5.3L gauges,radio,windows VIN: 2GCEK19T04 trying to figure out this system. dead ringer i thought for a bad ignition switch. start truck - fine. all gauges radio and windows inop. turn key slightly foward everything works fine. let go it stays that way for a second then the gauges fall out radio stops...	View
	2001 GMC C-Series Topkick C7H042 8.1L Misfire VIN: 1GDJ7H1E31 this truck has a misfire on cyl #7, worse when hot. it has spark,good fuel pressure, good compression.swapped coils to different cylinders and plugs. changed intake gasket. pulling hair out. no codes.	View
	2003 GMC Yukon SLE 5.3L Steering VIN: 1GKEC13T93 this yukon has a power steering problem only when moving very slow or not moving at all; the power steering works normal when turning to the left, but it binds up when turing to the right. it makes a hissing noise while it is binding up which sounds like a vac...	View
	1999 Oldsmobile Alero GL 3.4L Stall, Poor Fuel Economy VIN: 1G3NL12E6X Hey all, have this Alero in the shop. Customers concern is the vehicle intermittantly starts hard and stalls on startup. I could not duplicate in the shop. Looking at the long term fuel trim, it is running rich. Replaced leaky fuel pressure regulator a while a...	View
	2000 Oldsmobile Intrigue GL 3.5L Cuts out, hard start VIN: 1G3WS52HXY While driving vehicle,whether warm or cold she will flash the service engine light a couple of times and then lose power completly.no dash lights will stay on,like i lose all power.but the radio still retain power.i then will try to start vehicle with multiple... Trouble codes: U1064, P1626	View
	2001 Saturn L200 2.2L a/c clutch LAST MONTH VEHICLE CAME IN WITH A/C INOP. hAD BAD A/C SWITCH , REPLACE HAD POWER TO CLUTCH, NO ENGAGEMENT. RETURNED MONTH LATER AGAIN A/C INOP. POWER TO CLUTCH NO CONTINUITY CLUTCH HAD GONE BAD. TODAY REPLACED COMPRESSOR UNDER WARRANTY RECHARGED RAN FINE AND A...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Cadillac Allante 4.5L No Start, Poor Idle Quality, Stall VIN: 1G6VS3381N Well, this vehicle is not fixed and where this is going remains to be seen. Most responses were for the timing chain and with the info Mitchell had on valve timing specs it appeared to be correct. However upon removing the timing cover I found the timing marks...	13
	1993 Cadillac DeVille 4.9L Control Head VIN: 1G6CD53B0P Thanks for the help guys found the fuel data center shorted knocking out 16v out from bcm , again thanks for the help	2
	2001 Chevrolet Silverado 2500 HD 8.1L axle shaft VIN: 1GCHK23671 Thank You very much to all that replied. I had already used wedges (pry-bars centered on either side) & reseated the shaft. I tried rotating & centering the shaft, hoping the ring would re-center. The unit is a 9.25". After receiving all your replies, I g...	13
	1998 GMC Savana 2500 5.0L Misfire VIN: 1GTFG25M4W Well the replies were split about 50/50. Half said no and intake gasket could not leak coolant down into the intake port of the head, and the other half said yes it could. There were suggestions to take the rocker arms loose and do a leak down test but being a... Trouble codes: P0300.	14
	1999 GMC C6500 7.4L Cuts out, Misfire VIN: 1GDJ7H1D8X I'm not exactly sure what fixed this one! After hours and hours of checking and testing and checking and testing we fixed it... I fixed many problems such as leaking fuel injectors, CKP, CMP, and the "distributor" gear worn. Tested many wires and for some reas... Trouble codes: P0336 (CMP Performance).	8
	2003 GMC Envoy SLT 4.2L MIL Lamp on VIN: 1GKDT13S73 Using a mirror i checked the wires at the fan clutch to find all the the wires to be broke in half. i rewired the plug and this fixed all my issues Trouble codes: P1221, P1271, P1481.	4
	2001 Oldsmobile Bravada 4.3L Temperature gauge VIN: 1GHDT13W61 The Bravada is cured. First I need to say that we had already informed the customer about the coolant seepage and she was already scheduled for the repair next week. The gauge problem turned out to be a bad connection at the pcm. I started doing a wiggle test ...	7
	2002 Pontiac Grand Prix GT 3.8L low coolant light VIN: 1G2WP52K62 THANKS FOR THE REPLIES. THIS WAS A PRETTY SIMPLE FIX AND I SHOULD HAVE KNOWN. TWO AFTER MARKET SENSORS THAT GO IN THE RAD WERE NG. LIGHT WOULD COME ON AFTER ONE DAY. PUT OE (GM) IN AND PROBLEM IS FIXED AS I FOLLOWED UP WITH CUST AND LIGHT IS OUT 2 WEEKS LATER....	17
	2002 Saturn SL2 1.9L Poor Idle Quality, Hesitation, Cuts out VIN: 1G8ZK52732 Thanks to all replies. unfortunatley some of our posting was inaccurate. our Saturn was ok until hot then experienced a major tip in only at idle. part throttle and acceleration was normal as was all other performance. lucky we prodded around in the archives a...	6

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