GM Automotive Technicians Technical Discussion and Fixes for May 31, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1987 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP5134H This is my first post. We are buried under this Buick. We specialize in Euros so we probably took the long way around. Car would crank fine using engine crank switch but when ignition was turned on, it would sound like the spark timing was way off after the fi... Trouble codes: 52 (calpak fault)	View
	1999 Buick Park Avenue 3.8L warning lights VIN: 1G4CW52K9X Hello, thank-you in advance for any help you may have. Have a vehicle here that the Service vehicle now light and the Air bag light come on, as well as no transmission gear position display. Happens very sporatically, no drivability symptoms nor any codes in ...	View
	2000 Buick LeSabre Custom 3.8L Unknown VIN: 1G4HP54K2Y hi guys could use some help on this one.Customer brings in this buick complaining that the vent temp on the drivers side is warmer than the passenger's.I stick the thermomater in the vents and the is a 20 degree differance.This car does NOT have dual zone cool...	View
	2000 Buick LeSabre Custom 3.8L valve cover VIN: 1G4HP54K3Y we have this buick in the shop that has the rear valve cover leaking oil. i was wondering if anyone has a secret or hint in removing it without taking the timing cover off like the service manual says. the only thing keeping it on is just a tab of the timing c...	View
	1993 Cadillac Seville STS 4.6L Ride control VIN: 1G6KY5298P The code is for SO 73 RR accelerometer fault. I tested the circuit and everything leads to the accelerometer. There is no direct test for the sensor. Cadillac tells me there are no parts available for this car. When the system sees an error in the system it de...	View
	1998 Cadillac DeVille Concours 4.6L cam sensor VIN: 1G6KF549XW i have a p1377a code. Cam pulse to 4x reference pulse. The car is stalling and it is a hard code. Checked for loose connections and corroded wires.	View
	1988 Chevrolet C1500 Cheyenne 5.7L Cuts out, Stall VIN: 1GCDC14H7J Vhicle shuts off in reverse and drive. The fuel pressure oes away. Changed distributor, coil, and idle speed motor, but vehicle still has problem. Would appreciate any help I can get.	View
	1988 Chevrolet Cavalier 2.0L Poor Idle Quality, Hesitation VIN: 1G1JC5113J I'm looking for some help with diagnosing this 88 Cavalier's lack of power and poor idle quality conditions. When depressing the accel pedal it feels as is there is an exaust restriction. Backpressure was checked and was above 2.5 psi. Cat converter was replac...	View
	1989 Chevrolet Astro 4.3L "Y"-pipe VIN: 1GCDM15Z2K The 2nd "Y"-pipe has cracked at the right manifold flange (exact same as 1st pipe) aprox 1-yr ago. All new hangers/clamps/braces (per GM). It appears as if the left pipe "extended". There is a space about 3/8" at the separation. Any thoughts?? Thanks, Greg	View
	1991 Chevrolet K1500 Cheyenne 5.7L abs light VIN: 1GCDK14KXM Hi guys, as you can see I'm no electrical master by any means, but I can't seem to get rid of this code 10. All flow charts keep pointing to the brake light switch however it has been replaced and adjustment is very easy.Vehicle has low miles and the customer ...	View
	1992 Chevrolet S10 Blazer Sport 4.3L Low power VIN: 1GNDT13Z1N Got in a 92 S-10 Blazer the other day, with a complaint of Low power. Watching scan data shows the Knock PID switches to 'YES' as soon as the engine is started. No audible noise is heard at idle. Repalced the Knock sensor with an OE unit with no change. Discon...	View
	1999 Chevrolet Venture 3.4L Traction control VIN: 1GNDX03E1X Customer cam in telling us that the traction control light would come on intermittently. We did a brake inspection and checked for codes. We found both rear wheel cylinders leaking and the brake lining soaked on the left rear and a code P1380 "ABS DTC detected...	View
	1999 Chevrolet Cavalier Z24 2.4L drl VIN: 1G1JF12T5X This car was brought in the shop with the high beam indicator light on all the time. This car is equipped with DRL system and fog lights. All the lights work high beams, low beams, fog lights and flash to pass but the daytime running lights don't work or light...	View
	2002 GMC Envoy SLE 4.2L fan motor VIN: 1GKDS13S32 Thanks in advance for any help,We have a 02 gmc envoy in our shop that we cant get the fan motor to come on any speeds.We replaced relay module assembly under glove box and have tried a new HVAC control head but still no fan.The lights all come on on the hvac ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick LeSabre Custom 3.8L none VIN: 1G4HR5212R the electronics in the tranny were no good .replaced the tranny and that took care of the problem. thanks to everyone for their help. BILL [...]	16
	2001 Buick Regal LS 3.8L starting VIN: 2GRWB55K81 hi, thanks to everyone for their help. this vehicle is fixed and gone. first replaced battery - damaged positive post, no acid damage found. found connections in fuse box were bad, replaced fuse box, this provided partial fix, replaced ignition switch, this pr...	25
	1990 Cadillac DeVille 4.5L no injector pulse VIN: 1G6CD5330L Thank you all for the responses. This is a great club. I originaly had the complaint of no injector pulse in a 1990 cadillac sedan deville 4.5 vin [...]. We went thru all the procedures of testing Tps voltage,pass key voltage,pulsed ground to the c...	19
	1961 Chevrolet IMPALA 348CID cooling VIN: 11837S1699 Thanks to everyone for help i was astounded on the reply's I will give some updates first.1 It does have the factory 8 inch fan shroud.2 i can not find any clutch fan being installed on this vehicle and since it a show car putting one on would take away from v...	39
	1990 Chevrolet Caprice 5.0L MIL Lamp on VIN: 1G1BL53E2M We wind up using an old remedies to burn off the carbon off the top of the pistons after applying a little water at 2000 rpm the spark knock went a way. Customer use this vehicle in a small village never open it up carbon up bad. Thank you all for your suggest...	8
	1998 Chevrolet K3500 Cheyenne 7.4L starter drag VIN: 1GCHK33R4W There was a TSB that Mike [...]'Hara sent me to where the crankshaft sensor advanved the timing up to 50 degrees. After istalling the new sensor I had to reset the distributor and computer cam advance 35 degress back to zero. The truck is now running great. Thanks...	12
	2000 Chevrolet Malibu 3.1L cruise control VIN: 1G1ND52J6Y I replaced the brake switch on this car. with the multi meter i could see it flickering between applied and released. once i replaced it it worked great. thank you for your help.	9
	1998 GMC Safari SL 4.3L No Start VIN: 1GDDM19WB5 Well after checking everything we knew to check we had the computer reflashed and that did the trick.Why it went bad is anyones guess. Thanks for all the help. With no codes it was a hard one to fix.I had alot of people talk about fuel pressure and that was th...	14
	1999 Oldsmobile Aurora 4.0L park lights flashing VIN: 1G3GR62CXX Thanks for all the great responses, as most of you had suggested the multifunction switch had failed it was feeding a very slight current to the lamp control module intermitantly. Thank for all the help. Jim	23
	1999 Oldsmobile 88 Royale 3.8L engine VIN: 1G3HN52K2X The vechicle is fixed. Some one had replaced the intake and left out the pcv valve. Thanks for all the replys.	23
	1989 Pontiac Bonneville LE 3.8L Exhaust VIN: 1G2HX54C9K Hello Guys anb girls First I want to thank all the technicians who took the time to read my post Mark [...] There were good sugestions about how t...	13
	1992 Pontiac Bonneville SE 3.8L No Start VIN: 1G2HX53L7N The Pontiac is starting once again! The replies were very helpful and I was able to learn this system rather throughly. The fix was 2 seperate problems: 1. A bad key sensor in the ignition switch and a bad ground at the pass key module. I began the diagnosis...	8

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