GM Automotive Technicians Technical Discussion and Fixes for Jan 30, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1969 Buick electra 455CID brake drums VIN: 4846179H29 posting this request for another shop.looking for brake drums for this 1969 buick electra, new drums. located in dayton ohio area,does anybody know of any availibity of new drums.#2 car is a 1970 olds delta 88 I'm working on, looking for lower ball joints for ...	View
	1999 Buick LeSabre Custom 3.8L windows,locks,dash warning lights. VIN: 1G4HR54KOY Please help. This problem seems to happen most of the time driving down the highway. The dash warning lights blink on and off, radio goes off including the clock. Customer claims a grinding noise {relay?} under dash, lasts for a few seconds, clock comes back t...	View
	1998 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y5W Thanks for the help in advance guys. I have tested this car for hours. I will drive it down the road about 300 ft and the vehicle will hiccup and the light will come on and the P0101 code will set. I have taken a movie of the vehicle acting up and the maf sens... Trouble codes: P0101 (maf problem)	View
	1993 Chevrolet C1500 Cheyenne 5.7L fuel pump VIN: 1GCDC14K4P I feel this could possibly be related to my oil pressure sender, Being incorrect or defective in some way. My Hanes manual shows the it in the circuit with the f/p relay and it feeds off of the same fuse.if I unplugg the relay engine still starts and runs	View
	1995 Chevrolet C3500 Cheyenne 7.4L to much fuel/misfire VIN: 1GBKC34N2S customer states that after driving 4-5 miles that the driver side exhaust manifold would get cherry red. So he replaced the plugs and wires and problem still exist. Shop changed the driver side injector,and driver side exhaust manifold gasket. Checked driver s...	View
	1998 Chevrolet S10 LS 2.2L fuel gauge VIN: 1GCCS1947W this is one of those make my head gray. R+R sending unit and still reads past full. Kicker hook up MT2500 and slowly drops to 11%. unplug scanner and tap steering wheel and will go past full. tap the pcm, cluster, fuel tank nothing happens. The sending unit I ...	View
	1999 Chevrolet C2500 5.7L Pinging VIN: 1GCGC24R0X Engine spark knocks when engine is warm and under aload. Ive checked Timing, Fuel Pressure, MAP,MAf sensor,Plug wires,plugs,and did a top engine cleaning.	View
	1999 Chevrolet Cavalier 2.4L abs pump VIN: 4G1JF32TOX Hey guys I got this cavalier that has a code 1246 rear abs channel will not move.I tried to run a self test on it with the master tech and I can hear the motor run but then it stops.I also noticed on the scan tool that the abs voltage goes down to about 2.5 vo...	View
	2001 Chevrolet Silverado 1500 5.3L shift solenoid VIN: 2GCEC19T21 hello techs this pick up came in with tranny problems customer stated truck drives fine but when the truck gets hot,service engine soon light come on and slips when the truck came in,no mil went to test drive(about 15 minutes) and light came on and said p0756(...	View
	2001 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY22G81 Help!!! We have had this corvette come back twice with this po410 code. We replaced the check valves the second time. The air pump runs as suppose to. We are stumped and want to see if anybody has seen or heard of any problems with the air induction on the vet... Trouble codes: P0410	View
	2004 Chevrolet Suburban 1500 LT 5.3L abs VIN: 1GNEC16Z44 the "service stability" light comes on intermittenly and when it does the front brakes lock up, the vehicle has to sit for a couple of hrs before the brakes release...i REPLACED THE YAW RATE SENSOR 2 days ago but still the same problem...that was per a service...	View
	1997 GMC K2500 Sierra SL 5.7L MIL Lamp on VIN: 1TGEK19R4W Have installed lpg system .Drives good for a week or so with service engine soon light on until it gets enough codes and then goes into limp mode.Have fitted emulators to o2 sensors. I have tried everything i can think of to stop this occuring. It is only when... Trouble codes: P0133, P0153, P0171, P0172, P0175	View
	2002 GMC Envoy SLE 4.2L converter lock-up, shift VIN: 1GKDT13S52 Vehicle came in with complaint of poor power, fuel mileage, engine speed all over the place (customer's words). First thing I did, was hook up the scanner, no codes. Took it for a roadtest. Seems like the truck started off in 2nd gear even though the Gear PI...	View
	2003 GMC Sierra 2500 HD SLE 6.6L Check engine light VIN: 1GTHK23113 This vehicle came in with check engine light on and no other complaints. Performing a computer scan revealed the following codes, P0700 transmission control system fault, and transfer case code P0836 4wd switch circuit. We have performed the tests that Mitchel...	View
	1998 Oldsmobile Intrigue 3.8L turning lights vehicle came in with no hazards in front only! rears work fine. the turn signals will not work in front-but will work in rear-but real fast!the daytime running lamps work fine,the front turn lights in front will come on but will not blink.i replaced the daytim...	View
	1993 Saturn SL1 1.9L Cuts out, Stall VIN: 1G8ZN5591P Ok, you guys are great and have helped m,e out in the past, so i could use it again This saturn will run fine for around 20 minutes, after it is good and hot, it will start to backfire through the intake, and stall, changed the crankshaft sensor, but didnt ma... Trouble codes: 26 (Quad driver module failure), 27 (Info flag QDM failure), 48 (info flag Reference pulse error), 42 (Bypass line error)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1998 Chevrolet C-Series Kodiak C7H042 6.0L manifolds glow red VIN: 1GBJ7H1PZW preformed all suggestions from the 33 replies and it is better but still glows, cust. needed truck back, will be back at later date to resolve issue thanks to all.	35
	1998 Chevrolet Express 2500 LS 5.7L converter VIN: 1GCGG25R5W want to thank you all for your time,we tried ted and scotts idea of addative and it did he job. after thinking about it i remember when ford used to add friction mod to trans fluid and it cured up shift shudders. now we are going to use jervus's idea and flush...	8
	1998 Chevrolet Blazer 4.3L hard start VIN: 1GNDT13W6W wow thanks for all the very good replies,mostly reflecting on the fuel pump concerns of not holding pressure.although the customer and i talked aa long time about the pump and how it didnt hold pressure.I didnt feel that that was all the problem. especially af...	20
	1999 Chevrolet Blazer 4.3L Transfer case VIN: 1GNDT13W5X Thanks to everyone for your expedient and accurate responses'. Here's what was suggested: 1) Check the TCCM for water damage. There wasn't any obvious. 2) Test the TCCM and the circuit to the VCM, grey/black wire pin F7 on the TCCM plug to pin 23 of the black ...	7
	2000 Chevrolet Astro 4.3L lifter noise VIN: 1GCDM19W2Y thanks for all the advice everyone. we switched the customer to 20w50 as suggested by some and of course the lifter noise has subsided for now. now i can't wait to get the phone call on the next 0 degree day from him screaming 'my van won't start!' he's one th...	13
	2001 Chevrolet Silverado 2500 6.0L oiling VIN: 1GCHK24U11 hello guys tried pump and oring with no succes to the lifter noise . decided to chase the rabbit down the hole inspected and plastic gaged all bearings micked cam and bearings all was within specs. the only thing i could find was that cheesey oil passage plug ...	13
	2001 Chevrolet Express 3500 5.7L No Start, MIL Lamp on VIN: 1GBHG31R11 I recieved many replies on this particular problem,I was told to check the distributor cap for cracks also to check for a sloppy timing chain but do to the size of this box truck I could not let it sit in the middle of my bays so I did some of the obvious chec... Trouble codes: P0341, P1345.	22
	2002 Chevrolet Tracker 2.0L Engine VIN: 2CNBJ13C82 Thanks to all who replied, The problem with this one was the vibration dampner. After I replaced the dampnedr the noise went away. Thanks again to all who replied.	3
	2003 GMC Sierra 2500 SLE 6.0L mode door VIN: 1GTHC23U23 Well after much poking around I found the cam wheel started to bind with one of the door legs when the vehicle was cold . the fix was to replace the cam wheel and defrost door and that stopped the binding. My comment on how the system was designed still stands...	4
	1999 Pontiac Grand Am SE 3.4L overheating VIN: 1G2NE52E1X thanks for all the help most of you stated that the head was leaking. and after testing that is the problem. customer owns a local parts store and had me drill a small hole in the t-stat to allow the air out. i laughed but performed the work and was supprised ...	38

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