GM Automotive Technicians Technical Discussion and Fixes for Dec 27, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick LeSabre Limited 3.8L air flow VIN: 1G4HR52L8R dear fellow techs, do i need a degree in electronics to figure this buick out. ` customer comes in with complaints of no air flow from panel vents and temp of air not getting to hot from other floor/defrost vents. we replace the control head and that didnt fi...	View
	1997 Buick LeSabre Custom 3.8L Fuel Guage VIN: 1G4HP52K8V This car came in with a code 0121 and I determined that the PCM was bad. I got a used PCM and the drivability problem was fixed, check engine light out all was good. Then I noticed that the fuel guage was not working. I plugged the old PCM back in and the guag...	View
	1997 Chevrolet Tahoe LS 5.7L alternator VIN: 1GNEK13RXV Hello all, This vehicle has had repeated alternator failures. The vehicle arrived with no alternator output. The alternator was replaced with a less than desirable aftermarket rebuild. After replacement the alternator output was 13.5 to 14.2 volts and 90 amps....	View
	1998 Chevrolet Tahoe LS 5.7L transfer case VIN: 1GNEK13R1W has no four wheel assist. can here the encorder motor run took encorder loose from transfer case with the wires hooked up and could see the motor run.The disconnect on the front axle is working, thanks in advance	View
	1999 Chevrolet C1500 Suburban 5.7L Poor Idle Quality, MIL Lamp on VIN: 3GNEC16RXX First sign of problem started with the engine being hard to start when hot (Summer) - cold starting never a problem. Problem progressed into rough idle, heavy fuel smell, but engine runs and performs smooth above idle. Parts replaced: New Delco Plugs, New Roto... Trouble codes: P00, 172 (System too rich left bank), P00, 300 (Eng. Misfire detected)	View
	1999 Chevrolet C1500 Suburban 5.7L Poor Idle Quality VIN: 3GNEC16RXX Need installation help: Problem converting from a CSFI to MFI system. Concern for bending and damaging the fuel lines from fuel meter body to fuel injectors They are Not bendable like the poppet nozzle lines. What is the secret? I have service bulletin - docu...	View
	2006 Chevrolet Trailblazer LT 4.2L No Start, Poor Idle Quality, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1GNDT13S76 ENGINE IS SO RICH IT FLOODS OUT THE SPARK PLUGS -WILL ONLY START WITH NEW PLUGS AND SOON REFLOODS unless driven hard! The following parts have been replaced due to scan tool readings being out of spec: MAF, MAP, CPK, CMP, PCM All grounds have been resistance...	View
	1996 GMC K1500 Sierra SL 5.0L Excessive Emissions, MIL Lamp on VIN: 1GTEK14MXT Hello and happy holidays everyone, Got a real "challenge" in our shop.The vehicle was towed in a couple of months ago w/'cranks wont start' concern. We replaced fuel pump, strainer, filter and reflashed pcm w/gm drivibilty, multiple dtcs update and sent her o... Trouble codes: P0172, P0175	View
	1996 GMC Safari SLE 4.3L Hesitation, Cuts out, Stall VIN: 1GKDM19W4T Hi every one, we have this van a while and it is drove me nut. we check fuel pressure shown 65 psi, spark is good, ignition coil short to ground intermittently. we replaced the ig. coil. vehicle drive nice for a day or two and suddenly stumble and die fuel pr...	View
	2004 GMC Yukon XL 2500 SLE 8.1L encoder VIN: 3GKGK26G04 i have this yukon ´04 with the code co327 (encoder circuit). i have no info for this problem. the 4wd light sometimes is on and so, system is innoperative; sometimes works fine. don´t know if theres is a bulletin for this. thanks.	View
	1997 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NE12T8V this car came into my shop from an auto auction with complaint of no start and gas smell. we pulled the spark plugs and they were soaked with gas and plug wire boots were melted. after looking further, we removed air intake from throttle body and found fuel in...	View
	1998 Pontiac Grand Am SE 2.4L engine lubrication oil light on. checked oil pressure at sender. 5psi at idle 5 psi at 3000rpm. remove oil pump to inspect for restriction and any other cause for loss of pressure. no defects found. i suspect a blockage in the passages in the top end. viewing the flow chart it f...	View
	2001 Saturn L300 3.0L High speed blower VIN: 1G8JW52R41 Happy holidays everyone. The problem I'm having is that now the high speed blower does not operate, and I cannot find the high speed relay or fuse. Wiring diagram from Shopkey say's kick panel where fuse panel is located. Need help! Where is the relay and fuse...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2006 Buick Lucerne 3.8L pulls Thanks for all the replies, I got a great response. The only thing that made any difference was inflating the original tires to 44 psi. Several different sets of tires were tried at different air pressure settings. The car specified 30 psi. But only the origin...	20
	1991 Cadillac DeVille 4.9L Surge, popping VIN: 1G6CD538XM Thanks for all the help. We had to wait for the car to come back in and it was as simple as adjusting the throttle cable to correct the problem. Trouble codes: 30 (isc circuit malfunction).	10
	1996 Chevrolet Lumina 3.1L high idle VIN: 2G1W152M0T sorry for the late reply, my email has been on the fritz. after scouring the wiring on this lumina, i found a chaffed wire on the back side of the upper intake plenum that sends signal to the iac. when this wire would ground, the iac would fully open, causing ...	10
	1998 Chevrolet Lumina 3.1L tcc VIN: 2G1WL52M7W Thank you to everyone who took the time to reply! I am very sorry that it took so long to close the post, mother-in-law recited Shakespeare for two and a half weeks (to fix or not to fix, that is the question). Pulled trans and cut torque converter for inspect...	9
	1998 Chevrolet Blazer 4.3L 4wd system Well sorry have taken so long to reply but customer took vehicle without fixing it had to manually put into 2wd. The problem was this that the tccm had shorted internally which would cause the act fuse to blow and the heavy draw was the tccm trying to put powe...	7
	2000 Chevrolet Malibu 3.1L Poor Idle Quality VIN: 1G1ND52JXY First of all,I want to thanks every one.With that help it was an easy fix.Have changed the TPS and the idle is O.K..Before the readings on scan was TPS 0.98 volt,Throttle opening 5%.After fix TPS 0.60 volt, Throttle opening 0%. Thanks again. Trouble codes: P0341 (cam sensor).	7
	2002 Chevrolet Express 3500 LS 5.7L Misfire, MIL Lamp on VIN: 1GAHG39R82 I want to thank everyone who replied to my help request. Let me first tell you that ultimatly I ended up installing an updated injectors in this vehicle to take care of this problem. The style where they get rid of the poppets and go with electric injectors do... Trouble codes: P0300 (random misfire).	20
	2002 Chevrolet Venture LT 3.4L heat VIN: 1GNDXD3E52 Thanks to all who responded. Many said to replace both heater cores, but they were running freely when flushed. They were getting no flow. Tom & Dave said to check the X in the inlet quick disconnect fitting for a blockage. I did & there was no blockage or X o...	16
	1994 Oldsmobile 88 Royale 3.8L No Start VIN: 1G3HN52LXR I have not fixed this vehicle yet,but I have checked several of the help messages, such as the coil packs,fuel pump relay,the CTS,cam and crank sensors,and they allseem to check out ok. I have narrowed the problem to no fuel on cold start. The customer had to ...	30
	2001 Pontiac Montana 3.4L heater controls VIN: 1GMDX03E91 It appears that the actuator linkages were trying to move ,but there was so much grease on them [built up with dust and dirt] that when it got real cold, they couldn't move properly! Cleaned and relubed with w-d 40))) and so far so good! Didnt get much info on...	3

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