GM Automotive Technicians Technical Discussion and Fixes for Aug 21, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1999 Buick Regal GS 3.8L No Start VIN: 2G4WF5213X I have this supercharged Regal that we did some work on. One of my techs took it for a drive to refuel it and reset monitors and it stalled as he was driving. I towed it back to the shop and found no spark. Checked for codes and none found. Got out the vantage...	View
	2003 Buick LeSabre Custom 3.8L High RPM VIN: 1G4HP52K93 I have a problem with a high RPM after the engine warms up. The idle speed is high in gear or with the A/C on. When idle is steady I can controll the idle speed with the IAC functional test. After warmed the idle speed sits between 900-1100 RPM and can fluctua...	View
	1997 Chevrolet K1500 Cheyenne 5.7L Brake Lights VIN: 2GCEK19R9V Brake lights didn't work on this vehicle, has power in to orange wire on brake switch, no power out on white wire. Replaced brake light switch, lights stay on all the time with a new switch. Tried 2 AC Delco switches and 1 Napa switch with the same results. Br...	View
	1997 Chevrolet Express 1500 LS 5.7L 3-4 shift VIN: 1GBFG15R8V Transmission guys please help!! This van came to me with a terrible clunking noise when moving. Confirmed noise coming from transmission(suspected planetary gears blown). Called my rebuilder who I have used many times with success, he built me a transmission &...	View
	1999 Chevrolet C3500 7.4L Hesitation, Surge VIN: 1GCHC33J8X Guys I need help. Chevy truck 7.4 comes in to the shop running fair. The truck was surging on the road and bogging down if you hit it hard from a stand still. Seem like a fuel problem. I test the pump and had only 48 pounds of pressure. I checked the spec. and... Trouble codes: P0157	View
	2002 Chevrolet Malibu 3.1L Gauges Compressor VIN: 1G1ND52J12 Have a 2002 malibu, vehicle ahs been well taken care of, one owner car, started the car today and the temp and fuel gauges did not move, the a/c compressor clutch will not engauge either. These items were fine the day before, fuses are fine, a/c has correct ch...	View
	2005 Chevrolet Colorado Z85 2.8L No Start VIN: 1GCCS19845 This is my bosses nephews truck. He drove it into town and stopped at the store. He came out and it wouldnt start. Ive ohmed out the clutch switch, scanned for codes, jumped the relay to get the starter to work and it works when I manually work the relay. When...	View
	2005 Chevrolet Aveo LS 1.6L Cuts out, Stall VIN: KL1TD52635 Hello all, this little Aveo is kicking our butts. It will intermitently lack power/die after a hot restart(15-30 seconds) and a high electrical load(ie. lights, A/C & rear defrost, etc). We changed the battery & alternator when we found that they were not keep...	View
	2006 Chevrolet Silverado 3500 LT 6.6L turbocharger VIN: 1GCJK33D96 I have an oil leak coming from under turbocharger. I'm following procedure in GM service information but am having trouble getting to exhaust pipes in back of engine. Does anyone one know of an easier way to remove a turbocharger on a 6.6 diesel? I'm thinking ...	View
	2007 Chevrolet Silverado 2500 HD Classic LS 6.6L Dimmer Circuit VIN: 1GCHK23D07 Hello techs. Truck was brought in for no illumination of instrument panel lighting at night. Customer had already installed a new dimmer switch. I found codes b2610 and b2625. Aldata states that both codes could be for an open in the TBC 2A fuse circuit. So I ...	View
	1999 GMC K1500 Suburban SLE 5.7L No Start, Poor Idle Quality VIN: 3GKFK16R9X Yes, I know the pressure is low but I'm not sure why. I have never worked on this specific rig before and don't know it's history. Customer said car would not accelerate over 25 mph. When I got it, the battery was dead so I replaced it. It fired right up and I...	View
	2003 GMC Envoy SLT 4.2L MIL Lamp on, reduced power mode VIN: 1GKDT13S93 help!! car came in from another shop (again!). complaint was no acceleration. had codes po463, 1275, 1280, 113, 1635, and u1000. cleared codes and 1275 and 1280 come right back. computer was replaced and programmed, throttle body was repalced and pedal positio...	View
	1991 Oldsmobile Cutlass Calais 2.5L Stall, Backfire So I performed previous work last fall. seemed ok when test drove, at the time. Now that it's warmer to hot it has been backfiring and stalling when coming to a stop. checked egr, previously.seemed to be working ok. Any and all suggestions greatly appreciated ...	View
	2002 Pontiac Bonneville SLE 3.8L final drive vibration VIN: 1G2HY54KX2 any input would be greatly appreciated	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2008 Buick Enclave CXL 3.6L a/c cut-out VIN: 5GAER23748 thanks to all who took time to read and respond. biggest problem with the diagnosis of this car was the fact that it had been through the ringer at another shop before we took a poke at it. apparently while they were testing, they must have backprobed the wiri...	3
	1998 Chevrolet Tahoe LS 5.7L speedometer VIN: 1GNEK13R4W Thanks for the replies.They gave me more to look at.As it turns out the problem must have been a poor connection in the harness between the vss sensor and the pcm. I checked the triger ring inside the transfer case using a borescope, I looked for any corrosion...	13
	2008 Chevrolet Impala LS 3.9L cooling system VIN: 2G1WS55318 The PDC has to be disassembled & inverted to remove the harness connectors from underneath, locating the correct wires VIE schematic in the TSB helped, all the re-splices go toward the (harness side ) into the conduit confusing until you do one, we will see ho...	2
	2001 GMC Sonoma SL 2.2L Evaparator VIN: 1GTCS19511 time to close this post don't know just how to close as i don't know just what fixed it.To begin with i recharged it like I have many times before,next morning he called no cooling.changed high side service port and sealing washers back of compressor then it w...	18
	1992 Oldsmobile Cutlass Supreme S 3.1L Poor Idle Quality, Hesitation, Surge, Misfire VIN: 1G3WH54T0N Thanks to all of you for the help. It ended up being the #2 Inj it was short out internally. Once I heated up the engine and pulled the plenum it was obvious all the Inj measured around 13 ohm's but the #2 Inj was at 3.4 ohm's. So I replaced the #2 Inj and the...	15
	1994 Pontiac Grand Am SE 3.1L No Start VIN: 1G2NE15M9R thanks fellow techs turns out ecm was bad customer had fan wired in 2 diffrent locations cause shorted thanks for your help.	8
	2002 Pontiac Montana 3.4L No Start VIN: 1GMDX03E32 i noticed that when the vehicle was not starting the cam sensor was not picking up signal, i replaced cam sensor and everything is good so far. thanks keith	3
	2004 Pontiac Grand Prix GT1 3.8L No Start VIN: 2G2WP52294 Well, I'm happy to report that after warrantying the ignition module and making sure there was ALOT of dielectric grease under it, I ran the vehicle outside of my stall for almost six hours yesterday with no failure. These modules are showing up here with eith...	9

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