GM Automotive Technicians Technical Discussion and Fixes for Nov 17, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1987 Buick Century Limited 3.8L Excessive Emissions, Poor Idle Quality, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G4AL5133H I am really hoping you guys can help me on this one. I am stuck. Here goes: To start off with, the owner of the vehicle is deaf, so communication is tough. Vehicle was overheating and stalling, came in with a major leak in the coolant hose to the throttle body... Trouble codes: 42 (Computer Controlled Coil Ignition or Bypass Circ. Failure), 43 (Electronic Spark Control Circ. Fault), 44 (old Lean)	View
	1997 Buick LeSabre Custom 3.8L high idle VIN: 1G4HP52X1V Thanks in advance for all your replies. This one has me stumped, intermittent but occurs 80 to 90 % of the time. When you start the car tps voltage is about .56v but the angle climbs to 1 to 2% and when this happens the idle goes up to about 1450rpm desired is... Trouble codes: P0507	View
	1991 Cadillac Brougham 5.0L high idle VIN: 1G6DW54E6M Hello, Techs I am working on this cadillac Brougham for a high idle concern. The idle is reading 1200 rpm in park and wont idle down. I checked for vaccum leaks couldnt find any and we replaced the IAC valve. The tps angle is reading 0 percent at idle. Does an...	View
	1994 Chevrolet S10 SS 4.3L No Start, Hesitation, Cuts out, Stall VIN: 1G3EF456GD This truck was brought to me because it is hard to start when cold, and sometimes will not start at all. When you first take off in the morning it sputters and won't get out of it's own way. As it warms up, it runs a little better. Before i get into it, this t...	View
	1995 Chevrolet Astro 4.3L Poor Idle Quality, Surge, MIL Lamp on, Suge at idle VIN: 1GNDM19WXS Customers major complaint is severe surging at idle,And by the way the MIL is on,She also says that if the MIL stays off the engine runs fine.The idle Has surged & the MIL been on the whole time since it came to our shop.I verified the MIl is on & it does surg... Trouble codes: 32 (EGR position out of range), 42 (EST problem), 45 (O2 fixed high)	View
	1997 Chevrolet Tahoe LS 5.7L Driving problem VIN: 1GNEK13R7V Hello all. Have a 97 Tahoe 4+4 that has a buck at 55 mph has no code`s. Cust took it to trans shop an they told him that the trans was good. Has no engine problems run great just has this buck but not all the time test drove it. had it in frist gear at 55 and ...	View
	1998 Chevrolet S10 LS 2.2L No Start VIN: 1GCCS1447W Well I have another S-10 problem a customer brought me.This is a 98 2.2L,it had intermitent run problems, sometimes it would start and run fine,just die and not start, or not start at all.The customer installed a new delco(factory) fuel pump,new fuel pump rela...	View
	1998 Chevrolet Blazer LS 4.3L battery VIN: 1GNCT18W8W Can't seem to find Draw Pulling all fuses on at a time still battery draw 1/2 amp. unplugged Bcm still draw, pcm unplugged alt unplugged still draw. When first shutting off vehicle, draw is at 1.35 amps then drops to .72 amps then to .50 and stays at .50 All d...	View
	2000 Chevrolet S10 4.3L brake lights VIN: 1GCDT19W2Y 2000 s10 No rear brake lights	View
	2000 Chevrolet Malibu LS 3.1L Passlock/Atd VIN: 1G1NE52JXY Thanks all for reading and your help,So I am looking for advice got this malibu with codes B2958,B2960 in history not current, and sometimes it wont start also while driving security system light stays on solid sometimes,I have delt with some of GM's passlock ...	View
	2002 Chevrolet Suburban 1500 LT 5.3L Cuts out, Stall VIN: 3GNFK16Z53 This vehicle came to me with an intermitent stall problem originally. Had a couple of 1200 series codes ( Electronic Throttle Body.) I lost my notes on this rig so I can't remember which ones. I did some research and found this was a common stall condition cu...	View
	2010 Chevrolet tahoe 5.3L power windows bcm VIN: 1GNUKAE06A while installing some radios I must of shorted out the light green wire to my assory panel there is no power there also dr window control is inop and a bunch of fault code come up over the dash	View
	2009 GMC Savana 1500 5.3L airbag diagnostic module VIN: 1GDFG15489 We got the Van that vas crached and repaired in the US. Above mentined DTC's are pending. The installed airbag diagnostic module part nr. [...]. The module is looking for rollower sensor, side curtains and seat weight sensors but by VIN this equipment was n...	View
	1996 Other GM T 300 5.9L Engine power VIN: 3NKHMH87X0 Hey diesel gear heads. My service truck lost it's edge. It's not using coolant or misfiring or moisture in oil so no blown head gasket. Power seems more normal in upper gear range at higher RPM on a warm engine. No boost gauge, so I installed one. At this cond...	View
	1998 Saturn SC2 1.9L shifting VIN: 1G8ZG1277W I have this SC2, its my personal car that I just bought a few weeks ago. the problem I am having is difficult shifting after driving for a while. the thing shifts great when I first get in it cold. after 20 minutes of driving or so it becomes very diffucult to...	View
	2001 Saturn L300 3.0L No Start, Lack of power VIN: 1G8JW54RX1 I have an 2001 Saturn L300 that has an extended crank. Sometimes it will start after about 1 minute of cranking, sometimes it takes 15-20 minutes. Every time it starts there is a strong fuel smell. Occasionally there is a small pop through the air box. The ect...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Chevrolet Tahoe 5.7L No Start VIN: 1GNEK13R6Y We installed a new Delphi pump & and a new connector. We also ran a redundant ground for the pump to battery negative. We suspect too much ground corrosion. Vehicle has Not returned...so that's a good sign!! A big thank you to all the people who took of th...	16
	2001 Chevrolet Silverado 3500 LS 8.1L 3-4 shift, shift indicator VIN: 1GCJK39G91 first off, thanks for all the assistance on this one. installed aftermarket part(needed truck fixed). all is well, no problems clearing DTC. the switch had been replaced atleast once before. no problems getting the connectors unplugged. resealed both plugs as ...	12
	2003 Chevrolet Express 3500 6.0L Water Pump VIN: 1GCHG35UX3 Vehicle's gone! Dealer water pump and several updated parts for the vacuum system from Butler(the manufacturer) have fixed this vehicle. After talking to Butler they mentioned that they have worked with GM on this exact problem. Through this we learned that GM...	13
	2004 Chevrolet Tahoe Z71 5.3L front differential VIN: 1GNEK13T64 Ok so big thanks to all the responses!! last night after hours I decided to pop the diff out...I took the caes apart and took a peek. Remember in my post I wasnt able to manually engage the diff with the actuator out..Sure enough when I took the right side apa...	7
	2005 Chevrolet Silverado 3500 LS 8.1L No Start VIN: 1GCHK23285 I decided to take the advice of Steve and remove the tank and clean it out real good, and removing any remaining fuel from the lines. I changed the filters once more,and at this time the truck is running and starting perfectly. I guess it still had enough gas ...	4
	2006 Chevrolet Silverado 2500 HD LS 6.6L No Start VIN: 1GCHC23296 Removed to timing cover to check for camshaft pin sheared or reluctor damage. Everything ok. Reinstalled cover and truck started right up. Did not change anything that we are aware of.	6
	1989 Pontiac Grand Prix 3.1L No Start, Stall VIN: 1G2WJ14T4T Thanks for all replies---found Verus and OTC would not comm with 89 car---Have Tech 2 scanner don't use, as often---all data there, but removed upper intake, ohmed all injectors #4 dead, replace #4 only, vehicle runs great. Thank you all!!!	17
	2004 Pontiac Grand Prix GTP 3.8L blower motor VIN: 2G2WR52444 A new blower motor fixed the vehicle. Seems kind of silly to me that the module isn't capable of handling current under the fuse rating (30amps). The new motor drew less current on high, about 6.5 amps.	4

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