GM Automotive Technicians Technical Discussion and Fixes for Jul 26, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick LeSabre Custom 3.8L Blower Motor VIN: 1GYHR5269R I removed the add on switch and wires(which had burned out at switch terminals) and traced ircuit to where add on had been spliced in. I found that at the fuse and relay box behind right kick panel wire had been cut out of box and a wire was run to add on swit...	View
	1995 Buick Skylark Custom 3.1L Downshift VIN: 1G4NV55MXS Vehicle Upshifts Fine But When You Are Coming To A Stop It Feels Just Like A 125C With A Bad L/U Solenoid, It Starts Chugging & Bucking And Will Stall Most Of The Time. I Don't Understand Why The Only Code That Appears When Pulling The Trans Connector Is For ...	View
	1988 Cadillac DeVille 4.5L climate controler VIN: 1G6CD515XJ hi, im looking for some info on this cad,the service air condition light is on and I cant keep it on auto it always goes to econ. the AC light will go off after a minute and as soon as I touch any controler button the AC light will come back on. all the button...	View
	1994 Cadillac Eldorado 4.6L Excessive Emissions, Misfire, MIL Lamp on VIN: 1G6EL12Y9R The car came in to have to transaxle replaced, after it was replaced another technician noticed what he thought was a misfire, i threw it on the scope and came up with bad wires. ( seen alot of these patterns before) Replaced the wires and the plugs, but the p... Trouble codes: P0076	View
	1988 Chevrolet Camaro 5.0L Cuts out, Stall VIN: 1G1FP21E8J I have this Camaro that wants to die at stoplights expecially when you brake and stop quickly. When running in the shop in park if you raise rpm then quickly let off rpm will drop down very low like it is going to die then pick back up. Fuel pressure and ignit...	View
	1988 Chevrolet Camaro 5.0L Cuts out, Stall VIN: 1G1FP21E8J I have this Camaro that wants to die at stoplights expecially when you brake and stop quickly. When running in the shop in park if you raise rpm then quickly let off rpm will drop down very low like it is going to die then pick back up. Fuel pressure and ignit...	View
	1997 Chevrolet K1500 Cheyenne 5.7L Brake lights VIN: 2GCEK19R7V Am looking for a good color coded wiring diagram for the connector that plugs into the brake light switch. This is a 6 pin straight plug at the switch, with an approximately 12 inch harness that goes into a 6 pin square (3 by 3) connector near the column. Thre...	View
	1999 Chevrolet S10 LS 2.2L Motor VIN: 1GCCS1947X This vehicle has a noise like a lifter knocking. It only occurs at higher speeds-1700 & above. It doesn't sound like a rod knock, but a loud lifter. It isn't really noticeable when sitting in the cab, but very noticeable with the hood is opening. When listenin...	View
	2000 Chevrolet Venture 3.4L ebcm VIN: 1GNDX03EXY Greetings all.. This 00 Venture came into the shop with the complaint of ABS light coming and staying on all the time. Pulled out the trusty Snap-On brick to get No Communication. Tried to communicate with the PCM and it worked fine. EBCM module problem so it...	View
	1999 GMC K2500 Suburban 7.4L abs VIN: 3GKGK26J9X this truck goes in to an abs stop every stop but only at the very last point before you come to a complete stop scaned system found code c0265 pump motor relay circut open did the flow chart called to replace ebcm replaced ebcm at a cost of 650. fixed code pro...	View
	1999 Oldsmobile Intrigue GLS 3.8L lt side outlet temp VIN: 1G3WX52K4X Hi gang! Posting this for a co-worker who inherited this gem from one of our other shops... What this thing does is blow noticeably warmer air from the drivers vents than the passenger side on ac (both set 60 deg's). When switched to heat on both sides, the pa...	View
	1996 Pontiac Grand Am SE 3.1L No Start, Stall VIN: 1G2NE52M6T this car came in with start and stall and would not stay running. ckecked code 1629 and found lock cylinder bad, replaced it and relearned computer as per specs. car started and ran good, customer picked up car and would not start with him. checked with scanne... Trouble codes: 1629 (theft fuel enable - incorrect no signal)	View
	1998 Pontiac Grand Am SE 3.1L cam VIN: 1G2NE52EXX Hey Guys , This engine is actually a 3.4 and this is the second time the cam has broken in half. Not sure why and more so what to do about it.Has anyone seen this before? If so some help would be graetly appreciated.	View
	2002 Pontiac Grand Am SE1 3.4L ABS speed sensor circuit VIN: 1G2NF52F62 Vehicle came into my shop for ABS, Service vehicle soon and traction lights on. Found trouble code C1233 rt ft speed circuit open or short. Road tested vehicle with scan tool and found that left rear speed sensor inoperable. All others were operating. Was wond...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Chevrolet Caprice Classic LS 4.3L Poor Idle Quality, Misfire VIN: 1G1BN52W2R The mystery turns out to be rooted in a poor test lead connection. I use Pomona test leads, and I was using the wire piercing ones that normally center the wire perfectly capturing and piercing the wire. But one of them was not holding the wire properly and wo...	4
	1994 Chevrolet S10 Blazer Tahoe 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDT13W5R thanks for all the help,we opted for the screened gasket'brilliant'.i am sure this will end all are problems thanks again Trouble codes: 32 (egr system problem).	26
	1995 Chevrolet K1500 Suburban 5.7L compressor VIN: 1GNFK16K9S theinformation I recievedwasvery helpful. Customer stopped repairs until he got more money since more indepth repair is required.	18
	2001 Chevrolet Tahoe 5.3L Evo VIN: 1GNEK13T91 Thanks to everyone that replied. Although all replies were thoughtful, we could not determine why we could not communicate with the body contol module module. Rather than start guessing and 'throwing parts at it' we decided to send it to the dealer because if ...	9
	2002 Chevrolet Impala 3.4L engine VIN: 2G1WF52E33 Thank you all sooo much for the assistance. I did ck the pcv. valve and oil cap but this 3.4L is different from the 3.8L. With the possibility of the noise being in the trans the customer is going to wait for any exploriitory surgury. I do appreciate the time ...	7

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