GM Automotive Technicians Technical Discussion and Fixes for Mar 12, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick LeSabre Limited 3.8L Unknown VIN: 1G4HP52K8W This vehicle came with a miss at 45 mph when lock up. I found the intake leaking and coils and wires bad. Now after it warms up when it shifts into fourth it clunks and sometimes it does it in third. Any help would be appriciated. The trans fluid is clean. Th...	View
	1979 Chevrolet C10 Scottsdale 5.7L engine ok, so I'm looking for a fellow engine builder to pick a brain...I have a 79 chev 350 2 bolt main '777' block with an estimated 300 hrs on it, only fresh water used and maintained fairly well. This motor came in a boat my cust bought knowing it had a 'rod knoc...	View
	1989 Chevrolet K1500 Cheyenne 5.7L No Start, Poor Idle Quality, Cuts out, Stall VIN: 1GTDK14K2K We have a intermittent no idle and stall with an added no start from time to time. We have check fuel pump pressure,map sensor idle air control and cleaned the plates, with no change. We changed the fuel filter when we checked the fuel pressure. If we unplu... Trouble codes: N0NE	View
	1992 Chevrolet K2500 Cheyenne 5.7L Poor Idle Quality, Cuts out VIN: 2GCFK29K5N this truck came to me with problem,poor idle when hot,somewhat low power,did some checking,no codes,but high fuel psi at idle but when you accel fuel psi drops to 8-9psi,replaced fuel reg.,noluck,unhooked return line @ tbi and ran it into a can,still no luck,r...	View
	1996 Chevrolet C1500 Silverado 5.7L power door locks VIN: 2GCEC19R7T This is an employees personal truck that was bought last year. It has all the power options, but did not come with a keyless remote. The problem is that when the key is turned on, the doors will automatically lock. Is there a way to change it to lock on a roll...	View
	2000 Chevrolet Silverado 1500 4.3L No Start VIN: 1GCEC14W2Y once the truck starts it will run forever.if sets overnight the injectors won't pulse and the inj. pw. pid stays at zero.with new dis. cam retard is at -1 and was at -17 with old distributor. has latest flash in pcm and I am stumpped. any gm guys out there I w...	View
	2001 Chevrolet Silverado 2500 HD LS 6.6L MIL Lamp on VIN: 1GCHK291X1 checked fuel press , dialed up with scanner first time and no reponse, cust took truck , picked up truck 2 days later, rechecked fuel press, dialed up with scanner act frp did increase , checked cooler ok, checked hoses seem to be fine. fuel temp ok 106 c. che... Trouble codes: P0093	View
	1998 GMC K1500 Sierra SL 5.7L Brakes VIN: 1GTEK19R4W Thanks for all of your help in advance. This vehicle had a low pedal complaint. The rear brakes were severly worn and the Master cylinder failed the block off test. So after the components were replaced the pedal remaianed low. The ABS motor would not energize...	View
	2002 GMC Sierra 2500 HD SL 6.0L Power steering pump VIN: 1GTHK23U02 Hello, I am working on this 02 Sierra with an odd problem. when you start it up the power steering pump begins to captivate air and whine. There are no visual signs of leaks and we have already tried flushing the unit and following bleed procedures. Since this...	View
	2006 GMC Sierra 2500 HD SL 6.0L brake pedal VIN: 1GTHK24U56 Brake pedal is harder than normal. Steering feels stiffer than normal. Truck has hydro boost. Fluid is full. Belt & tensioner are orginal, but appear normal. Checked Mitchell 1 bulletins (none). Condition of pads are fine.	View
	2002 Oldsmobile Alero GL 2.2L Fuel Gauge, Temp Gauge VIN: 1G3NK52F12 The customer has returned this car to us for the third time. She states that the gas gauge works erratically intermittently and the temp gauge reads near hot intermittently until she turns on the heater then the gauge reads about half way. We have not witnesse...	View
	2004 Oldsmobile Alero GL 3.4L Cuts out, Stall VIN: 1G3NL52E04 New one for me. This vehicle cuts out stalls ONLY when steering wheel is turned. It only requires movement of 1/2 inch. Quick or slow movement of wheel will result in IMMEDIATE stall. No Fault codes. It is like the key was shut off when it stalls... the effect...	View
	2004 Pontiac Montana 3.4L Surge This vehicle surges under acceleration. There are no codes, and no misfires listed on the monitors. It acts like a MAF sensor, however, when we disconnected it, there was no change. I did see some slight fluctuation in the TPS readings, but there was no change...	View
	2004 Saturn Ion-1 2.2L starter relay VIN: 1G8AG52F74 verified batt condition and found that when in crank position starter soleniod is only getting 4 volts tried looking at all data for info and could not find voltage ref...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Chevrolet Lumina 3.1L Excessive Emissions, NOX VIN: 2G1WL52M4T AFTER EVERYTHING I CHECKED, I WENT BACK TO THE CATALYST AND PERFORMED AN INTRUSIVE TEST. I FOUND THAT THE CAT EFFICIENCY WITH REGARDS TO NOX WAS ONLY 21%. THANKS FOR ALL WHO OFFERED HELP.	20
	2000 Chevrolet Malibu 3.1L Stall, MIL Lamp on, po507 VIN: 1G1NE52J2Y After numerous of you suggested ignition switch, I did the old wiggle test on wires to switch and found everytime it was jarred it would shut down car. It apppears to have solved problem. thanks Guys. I would have continued to beat my head against the wall wit... Trouble codes: P0507.	4
	2001 Chevrolet Monte Carlo SS 3.8L Hesitation, MIL Lamp on VIN: 2G1WX15K55 Wow... Thanks for all the great reply to my request. Lots of the great suggestions. We had already tested a lot of your suggestions, But Deke from Ohio was right on the money... with the map sensor it was broken, but the way it sits on the intake manifold you ... Trouble codes: P0103.	17
	2003 Chevrolet Tahoe LT 5.3L t-case VIN: 1GNEK13713 thanks for all the help. it was just the switch . We changedit and the phantom did not come back. All that trouble for just a switch	12
	2005 Chevrolet Colorado Sport LS 3.5L No Start VIN: 1GCDT13655 I can't say i got it fixed,but its running and custsomer has it.It has used computer in it.We tried to 4 other computers and itwould notprogram just go to about 70%and stop.TIS trying find out what going on,we tried to do it on another truck and did the samet...	11
	2002 GMC Envoy SLE 4.2L speedometer/ABS VIN: 1GKDT13S82 Well after checking the cluster thourghly, I went back over the Gm trouble shooting tree. And with alot of doubt, I came to the same conclusion, The P.C.M.??? Turns out the Gm guys were right... I installed a new PCM and flashed with the latest download and t...	3
	1993 Oldsmobile Cutlass Supreme 3.1L Surge VIN: 1G3WH54T7P Most said 1 pt in 15 seconds. I got an aftermarket mfg tell me 18 gal/hr, which works out to about 1 pt/15sec. I also happen to have a 89 buick 3.8 in the shop, it had about 1pt/15sec. So i would say 1 pt/15sec is correct. Just wanted verification. The car jus...	14
	1995 Oldsmobile Aurora 4.0L alt. VIN: 1GTHK23255 well,it was the batt.everything that came in that week was something very odd and hard,lol,i was over thikn it,thanx for all the help...jeff	12
	2002 Saturn L200 2.2L temp gauge VIN: 1G8JU54F52 hi all posting this as a almost fix i know for a fact the bcm is corrupting data sent to the cluster the fix would be a new bcm but my boss says we do not have the money to join gm/s ac delco site for flashing so i can't flash a bcm to fix vehicle so cust...	3

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