GM Automotive Technicians Technical Discussion and Fixes for May 1, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2003 Buick LeSabre Limited 3.8L Drivability VIN: 1G4HR54K63 Customer complains of a slight surge or pulling-back feeling when cruising. It happens with or without cruise on. When the cruise is on it will cancel when this happens and a track control message displays. It has set a code C1288 for the steering angle sensor...	View
	2001 Cadillac DeVille 4.6L power windows and locks VIN: 1G6KD54Y81 We have this 01Cad. Deville with the left rear power door locks and power windows not operating. We get a no communication reading on the scanner. All other modules in the doors are responding. Also, all other modules on the line are also responding. Checked t...	View
	1994 Chevrolet P30 7.4L Fluid VIN: 1GBKP37N8R Try putting fluid in resevoir n belches back as power steering begins to work.cut engine off n fluid comes back out thru lid,has hyro boost system for brakes n steering.pump is working cause as it runs low on fluid begins to growl.may pull a;; lines off n insp...	View
	1995 Chevrolet K2500 Cheyenne 6.5L Convertor lock up VIN: 2GCFK29S7S Sometimes while driving the check engine light wiould come on and vehicle immmediately went into limp mode. We repaired the harness and properly wired the electric brake. We also had to replace the ECM due to the harness short. All problems solved except for t...	View
	2000 Chevrolet Malibu 3.1L MIL Lamp on VIN: 1G1ND52J1Y My question isn't so much the codes I have but what my scan tool is doing. When I go to test the evap purge solenoid and the vent valve my scanner is unable to test them and say "vacuum too high in evap system". Not exactly sure what to do with this. I removed... Trouble codes: P0443 (Evap Purge Ctrl Valve CKT malfunction), P0446 (Evap Vent Control malfunction)	View
	2000 Chevrolet Tracker 2.0L Poor Idle Quality, Poor Fuel Economy, Vehicle vibration VIN: 2CNBE13C5Y Fellow techs, This vehicle showed up on my door step seems like I'm the last guy to go to. He has a engine vibration while idling and smooths out as soon as you go off idle. Now before you all laugh aloud let me tell you what he as replaced including dealershi...	View
	2002 Chevrolet Impala LS 3.8L Oil pres.guage VIN: 2G1WH55K92 Good morning everyone, We had a low oil pressure light coming on at idle when engine is hot, found sending unit leaking oil bad.Replaced switch w/ delco switch and same thing, this car has a guage also we can not find the sender for the guage (MOD only shows 1...	View
	2003 Chevrolet Venture LS 3.4L traction control VIN: 1GNDXD3E93 Hello, I have a vehicle that early in the morning the traction control light will activate when you have the wheel turn to the extreme left or right as you just begin to accelerate, then the light goes off. There are no codes and the light will not come back o...	View
	2007 Chevrolet Suburban 1500 LTZ 5.3L Lifter VIN: 1GNFK16337 Misfire on #1 cylinder, tick in the engine, with code 201. Vehicle has a displacement on demand active fuel management system. Pulled valve cover and found no tension on the intake rocker arm on #1. Could not see enough through the push rod hole to tell anythi...	View
	1999 GMC Safari SL 4.3L cross brace VIN: 1GKDM19W0X Am getting ready to do a long block 4.3 on this Safari. Was told GM has a replacement brace to pull motor out the front instead of out the bottom, any body hear of such a animal?	View
	1999 GMC K1500 Suburban SLE 5.7L No Start VIN: 3GKFK16R3X Hello Tech's. I have replaced this vehicles fuel pump with an updated style unit once before. Checked both power and ground at the fuel pump, both good. PSI at the fuel rail was 40psi. Spec. is 55psi with engine running. Dead head pressure on old pump was 40ps...	View
	2004 GMC Sierra 2500 HD 6.0L Mechanical VIN: 1GTHK29U04 This truck came in with a squeel type of noise, worse cold but not real loud, really don't notice it warmed up. When we lift it up we can hear it toward the back of the engine and we hear it echoing through the exhaust. I had one of these before and IATN has a...	View
	1996 Oldsmobile Achieva SL 2.4L No Start VIN: 1G3NL52T4T ok have this achieva that was towed in wont start try to start and the car is bucking like the timing is advanced popping back through the air cleaner,checked a few basic things then moved on to a compression test,found cylinder 1&2 are normal at 100 psi 3&4 w... Trouble codes: P1629, P0300	View
	1974 Pontiac Grandville 7.5L convertible top VIN: 2P67W4X145 I was wondering if anyone out there might have a wiring diagram for the conv. top. I saw a previous thread and tried to email a previous responder, but the email was not delivered. If I could find out how this relay works and how the motor woeks it would be gr...	View
	2002 Pontiac Grand Am GT 3.4L pressure control solenoid VIN: 3456789E92 hello and thanks in advance. This car came in with shutter on. the shifts, fluid burnt lots of material in pan. We removed the trans and replaced it with a totally different unit. it still shutters on the shifts.All pressures are good in all ranges sitting sti...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2003 Chevrolet Avalanche 1500 North Face 5.3L Differential VIN: 3GNEK13T53 Thankyou very much for pointing me in the correct direction. I sat in the back seat while somebody eles drove and you could feel grinding at your feet. The noise seemed to be comming from the rear. After giving custmer a price on replacing the rear axke with a...	19
	2004 Chevrolet Classic 2.2L no data from any modules VIN: 1G1ND52F74 Checked fuse box had checked before, after reading the replies found out under load voltage would brake down. Took a chance and cut open fuse box, burned up inside has had water in it. Installed new box from gm comes with new fuses and relays.Car runs fine tha...	15
	2006 Chevrolet caprice 6.0L 4th shift many thanks to you all, just something, all i did was basic,but i found that clogged catalytic converter, and now I just found out that can cause this problem. many thanks again...	7
	1995 Saturn SL1 1.9L Radiator Fan VIN: 1G8ZH5284S WELL IT TURNED OUT TO BE OK. I JUST LET IT RUN FOR A LONG TIME AND THE FANS CAME ON WITH NO PROBLEMS. THANKS	10
	2007 Saturn Outlook XR 3.6L Steering column VIN: 5GZER23737 We did a system flush and refill with Dexron6. Because of a time problem,[customer went to Fla. for spring break], we could not attempt the rack valve. A week later and 1000 miles+/-, the noise is gone. If I have another SUV like this [Acadia,Outlook,...] I wi...	8

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