GM Automotive Technicians Technical Discussion and Fixes for Jan 14, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1992 Buick Park Avenue 3.8L Dual Zone VIN: 1G4CW53L5N hi everybody : This car has a dual zone ECC systems,customer complaint blowing cold air at passenger side when the system is set at hi heat,the driving side is working normally. This vehicle has a cooling leaks at the intake by pass hose 2 months ago,the bat...	View
	1989 Cadillac Fleetwood 4.5L Excessive Emissions, Poor Idle Quality, converter glows red VIN: 1G6CB5153K OK, this started out as a slam dunk that is now slamming ME. What seemed obvious pattern fail territory is now uncertain guessing games. Subject vehicle was referred to us...new customer...transmission was REBUILT locally less than 20 miles ago. Customer comp...	View
	1990 Cadillac DeVille 4.5L MIL Lamp on VIN: 1G16CD1331 thanks in advance for any help. car came in w/ check engine light on. pulled code 48, egr control problem. went through the flowchart from alldata and it said to replace the egr solenoid. after replacing solenoid no vacuum was getting to the egr still. 18" of ... Trouble codes: 48 (egr control problem)	View
	1985 Chevrolet G20 Sportvan 5.0L windshield wipers VIN: 1GBEG25H8F This van has a problem with the windshield wipers coming on with the wiper switch in the off position when you first start the van or just turn the key to the on position they wipe anywhere from 1 to 4 times then return to the park position. They work fine aft...	View
	1986 Chevrolet Monte Carlo 5.0L Starting VIN: 1G1GZ37H6G Customer brought his vehicle in with the complaint of "dragging during starts" I went to pull the car in adn I didn't think it was going to start. It was cranking very slow, but it started and I drove it in adn went to try the starter again and it was just fin...	View
	1994 Chevrolet K2500 Suburban 6.5L cooling system VIN: 1GNGK26F0R Howdy There, This is my personal truck and I hate working on it. November 03 I removed the heads and had them welded due to combustion gases in the coolant reservior. Now I am loosing about a gallon of coolant a week, no bubbles in reservior this time but the ...	View
	1995 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W1S Greetings, techs, this blazer intermittantly sets p0138 - b1s2 o2 voltage high. The test tree in MOD has you check o2 for operation. Then you jumper o2 sensor high and low wires on ecm side and look for reading ( 35 mv. Got a reading of 18 mv. Tree then direct... Trouble codes: P0138	View
	1997 Chevrolet Blazer 4.3L Drive-axles VIN: 1GNDT13W9V The 4 wheel drive on this vehicle will no engage to front wheels. It is a push button on the dash and the light comes on when the button is pushed. The vacuum actuator under the battery is getting vacuum. The actuator is also working when the 4wheel drive is t...	View
	1997 Chevrolet Blazer 4.3L 4 wheel driv VIN: 1GNDT13W9V The 4 wheel drive on this vehicle will no engage to front wheels. It is a push button on the dash and the light comes on when the button is pushed. The vacuum actuator under the battery is getting vacuum. The actuator is also working when the 4wheel drive is t...	View
	1997 Chevrolet Blazer 4.3L transfer case VIN: 1GNDT13WOV Hi Group, In desperate need of your help. This Blazer came in locked in 4 Lo , shift motor would just clunk when attempted to shift like it was jammed. Replaced with one from a salvage yard , it now has 2 Hi and most of the time 4 Lo but rarely 4 Hi. This is s...	View
	1999 Chevrolet Astro 4.3L Surge, Misfire, MIL Lamp on VIN: 1GNDM19W8X Customer has brought van in 3 differnt times, complaining of shudder/misfire at highway speeds (freeze frame shows 56-60 mph)usually first drive of the morning. The only obvious data that shows out of range is the cam retard- Scanner shows -16 degrees. Once co... Trouble codes: P0300 (Random misfires)	View
	1996 GMC Jimmy 4.3L turn signals VIN: 1GKDT13W5T hi everyone, i hope somebody has seen this one because i am at witts end.thi car came in and when the left turn signal is on the left turn signals blink, the right turn signals blink dim, the panel lights blink, the compass and overhead lamps blink along with ...	View
	2000 GMC Sierra 1500 SL 4.3L No Start VIN: 1GTEC14W2Y This truck will not fail to start unless it sits for aprox 24 hours -- starts normally at 12 hours. Fuel pressure does drop, but reads the same at 12 as it does at 24 hours. Cranking RPMS read on scanner when we have the no start. I have not noticed a security...	View
	2001 Oldsmobile Intrigue GX 3.5L MIL Lamp on VIN: 1G3WH52H81 hello all this olds has been here twice within the last year to have an air pump put on,due to water getting into the pump motor.Ihave moved the air tube with the filter everyway to keep water from entering.There are no tsbs on this problem.Any help from all y... Trouble codes: P0410	View
	1998 Other GM Corsa B 1000CC preformance VIN: WOLOSBF08W Vauxhall Corsa B (European model) 1998 model. 1000cc [...] model. Engine number. X10XE Chassis [...] Dear friends, It is great to be able to write to you guy's out there again. Homwever, I have a problem with a Corsa B, & I am wondering...	View
	1991 Pontiac Sunbird LE 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G2JB11T8M this car seems to have rough idle once it goes into closed loop. intergrator drops to 85 and block learn stays at 100. with the probe HC reads great at 2000 RPM and CO is great .2 but when relasing the throttle the HC & CO goes up and down. So bad sometimes 8-... Trouble codes: 45 (rich condition)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1976 Cadillac Eldorado 8.2L master Cyl, Hydrauric Unit, Proportion Valve VIN: 6L67S6Q214 Thanks much again for those who gave me great infos for fixing this car. Frank from cal hit on the money. I checked rear caliper & found out parking mechanism was frozen & somebody adjusted parking cable all the way but still rear brake doesn't hold(free wheel...	13
	1985 Chevrolet K30 Custom 5.7L clutch VIN: 1GBJK34M8F first i want to thank all that took time to reply.i blocked off the clutch master and it was ok,after bleeding the system with both vacuum and by hand, still had same symptom.i had the truck up in the air and could not watch the fluid reservoir mistake no1,the...	11
	1985 Chevrolet Blazer K10 6.2L all gears Well, almost everyone thought it was the torque convertor that failed. And they were right. I sent the torque into a convertor shop and they cut it open and the splines were stripped. Reassembled the trans and installed a new torque conv and all is well. Thank...	12
	1995 Chevrolet Corsica 3.1L heater VIN: 1G1LD55M65 Vehicle was repaired and heat is now working great. Problem was found when the intake was removed and EXCESS silicone was seen covering the rear coolant ports. Seems someone thought more was better. Also flushed out system just to make sure that no more globs ...	22
	1997 Chevrolet Blazer 4.3L Misfire, MIL Lamp on VIN: 1GNDT13W4V Thanks to all who replied. A special thanks goes out to John Thorton. I contacted him about this Blazer, and he recalled a case in Canada that had the same simptoms and directed me to the IATN forums section. Sure enough, the simptoms and lab scope patterns we... Trouble codes: P1341 (Can Sync), P0339 (Crank Sensor Erratic).	8
	1997 Chevrolet K1500 Cheyenne 5.0L abs VIN: 1GCEK19M3V Thanks to everyone who responded. We lifted the vehicle on the hoist and spinning all four wheels [ 4x4 ] applyed brakes to simulate abs operation. Blead brakes again .[ as per Jeff from Indiana ] procedure. Truck has a good pedel. Road tested & customer is ha...	13
	2000 Chevrolet Impala LS 3.8L Surge VIN: 2G1WH55K8Y Thank you all for your help I monitored all the engine data and could find nothing wrong so I have come to the conclusion that the problem must be internal transmission and the customer has taken the car to a transmission shop	12
	2002 Chevrolet Trailblazer LS 4.2L Drive-axles VIN: 1GNDT13S72 Thank you for your replies it was as many of you suggested the axle seals causing the noise. Replaced both outer seals and it took care of the problem.	19
	2002 Chevrolet Tahoe LS 5.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNEK13Z62 most of you got this on immerdiatlly. for some reason i overlooked that. The right side Cat. Convertor was broken and plugged. Thanks so much to everyone, Robert Trouble codes: P0300.	12
	2002 Chevrolet Impala LS 3.8L Idles high VIN: 2G1WH55K22 I received several replies regarding the wiring harness and pigtail. After re-checking everything, the customer contacted a large, out of town dealership and they agreed to fix it under warranty. I haven`t heard anymore at this time. Thanks to all who relied a... Trouble codes: P1122 (TPS intermittant low voltage).	8
	2003 Chevrolet Express 3500 6.0L Cuts out, Stall, MIL Lamp on VIN: 1GBHG31U23 Vehicle was returned to customer before I could try anything, customer was to return when truck when not needed. vehicle was brought to another shop on the road and after 2 days of working on it they found corroded wires in the computer harness behind left inn... Trouble codes: P0130.	6
	1990 Geo Prizm 1.6L Transmission Thank you for all the responses. Most said that when I downshifted it sucked up all the junk from the bottom of the pan and that if I dropped the pan I would find debris. Well, after removing the pan I did find some gunk. So I ordered up a filter kit and then ...	7
	1999 GMC Sierra 1500 SLT 5.3L Heated Seat VIN: 2GTEC19T5X Most of the advise I received pointed to the seat heater element as being the most common failure. It is wired in series with the seat back element so when one fails neither will work. Well, while moving the seat up & down, back & forth, tilting the seat back ...	6
	1987 Pontiac Bonneville 3.8L Poor Idle Quality, Cuts out, Stall, Misfire i found that this is a 3 code 3.8.we had a bad cam sensor interupter.replaced timing chain and a new interupter and the car runs great.	15

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