GM Automotive Technicians Technical Discussion and Fixes for Jun 20, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1996 Buick LeSabre Custom 3.8L converter VIN: 1G4CW53A1T The customer brought the car in with a cel on scan tool shows po1870 furthur conversation with the customer states they had it at another repair shop. the repair shop installed a new TCC sol. and the Sonnex tcc repair kit according to there invoice.they had it...	View
	1998 Buick Regal LS 3.8L air selector VIN: 2G4WB52K3W This is my Mom's car. I need help! I cannot find info on diagnoseing this problem. Mitchel and alldata tell me how it works, wiring diagrams and all, but no trouble shooter. The car has dual zone manual AC/heat. Has a knob that turns to select where the air sh...	View
	1998 Cadillac DeVille 4.6L a/c system VIN: 1G6KD54Y5W Hi Techs This Cadillac will not keep the a/c compressor on long enough to blow cold air, low side pulls to 45psi and compressor kicks off, the hi side goes up to 200psi. I recovered the freon & it was exactly full. Found code b1312 hi side tempature sensor ci...	View
	1954 Chevrolet belair 250CID caster/camber VIN: 1254879791 Hey guys, Im looking for alignment procedures for this vehicle. I have the specs but don't see were it adjusts.There's no shims/eccentrics/or slides that I can see. Any help would be appreciated. Thanks Bill	View
	1985 Chevrolet K10 Scottsdale 5.7L Surge VIN: 1GCEK14LOF Those of you who have been working on cars for 25 years plus remember the computer controlled carburators. Who would have known we would be setting the dwell on a carburator? Ha. You also remember being told that the slight pinging on accel and cruise was " th...	View
	1989 Chevrolet C1500 Cheyenne 5.7L No Start no start, spark is good. no inj. pulse and no cummunication. new plugs cap rotor, wires.check all power and grounds. all good. have no reference volts at anything. fuel pressure also good. also tried new ecm. made sure ecm was good by trying it in another truc...	View
	1991 Chevrolet Corvette ZR-1 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire VIN: 1G1YZ23J0M this vehicle came in with a bottom end noise . this is the lt 5 engine . the machine shop rebuilt the engine . the engine was reinstalled & started . ran ok through idle procedure then test driven . ran ok driving for 2 hrs at 55 mph but at idle a slight miss ...	View
	1991 Chevrolet C1500 Cheyenne 5.7L airflow VIN: 1GCDC14K2M Hello All: Let me start by saying I am a Jag tech. This Chevy pickup is my personal truck. I've owned it for a couple years and it has been trouble free. Currently, a large hi-rise next to my shop is being constructed. They are now sheathing it in cheap, whi...	View
	1999 Chevrolet Silverado 1500 4.8L Instrument Cluster VIN: 1GCEK14V9X Hello fellow techs, This 99 Pick-up's instrument cluster is in-op on one side. Everything on the left side, Tach, message center, Speedo & odometer do not work. The only thing I get on the left side is the CES Lamp with a P0440 code. All fuses check out okay. ...	View
	2000 Chevrolet Prizm 1.8L Cuts out VIN: 1Y1SK5282Y Car came in on tow truck. Managed to get it started and found when you turn the turn siginals on the car would near die. Also no head lights or day time running lights. Do to a lack of ground the DTRL module would blow.	View
	2004 Chevrolet Express 3500 6.0L Steering VIN: 1GCHG39U14 Hello We have this 04 van that has avery bad shimmie in the steering wheel only while braking.This problem doesnt happen everytime worse between 45mph-60mph when applying brakes.Replaced idler arm&pitman arm resufaced front rotors rotated tires aligned front e...	View
	1998 GMC Savana 3500 5.7L Poor Fuel Economy, power loss VIN: 1GDHG31R6W Hello fellow tecs, This truck has come to me after the customer replaced the intake manifold gaskets on his own complaining of a loss of power and the exaust manifolds glowing red after a hard pull. ( This hadden't happened in the past ). I first thought inter...	View
	2004 GMC Sierra 2500 6.0L cooling system VIN: 1GTGK23U64 cooling system worked great last year while pulling a 20 ft trailer, but this year the truck runs very hot (260deg) on long runs and up hills. we replaced thermostat and flushed cooling system. we performed hc test in cooling system and passed ok. temp guns sh...	View
	1998 Pontiac Grand Am SE 2.4L pass key VIN: 1G2NE12T1W is it possibe to just reprogram the new column or is it cheaper to replace the original and put in a new ingnition switch? thanks for any help, i figure it will come to me on the hook.	View
	2000 Saturn LS2 3.0L head torque spec. VIN: 1G8JW52R6Y We are doing the head gaskets on this Saturn. The Alldata spec. for torqueing the heads say to do 18lbs. then 90 degrees, another 90, another 90, then 15. After the first 90 it must be 80-90 lbs.. We called two Saturn dealers, one said that the spec. is correc...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Buick LeSabre Custom 3.8L convertor lockup VIN: 1G4HP52K5V Not much to report that would help anybody else,just pay attention to what you take apart.Not putting the TCC solenoid screen back in causes lockup in 2nd gear.The car works fine now.Thanks for the help!	3
	1988 Chevrolet Cavalier 2.0L Poor Idle Quality, Hesitation VIN: 1G1JC5113J I thought I had closed this but must have done something incorrect. Anyway.. I did fix the vehicle finally after a vacation and some great AC Delco parts. Thanks to all of the great responses and emails I received from all of you. The problem ended up being a ...	32
	1992 Chevrolet Astro CL 4.3L speedometer VIN: 1GNDM19Z6N Hello all it seems as though letting the tough ones sit a little and thinking about them is a good thing. What happened here is that I received a email from a fella that suggested checking the pink and purple wires at the brake switch. I found that the circuit...	9
	2001 Chevrolet S10 4.3L Misfire, MIL Lamp on VIN: 1GCCS19W91 Last Friday, I called GM TECH Line again. (3rd Time) Before, they had been of little help. This time they told me of an internal bulletin that described the complaint exactly. It reads, 'a #4 misfire setting code P0300 and #1 showing a low number of misfires a... Trouble codes: 0300 (misfire 4 cylinder).	19
	2001 Chevrolet Venture LS 3.4L drivers side impact air bag VIN: 1GNDU23E12 Thanks to all and especialy Bob. Wire harness chaffed. at the module and and the harness near the drivers seat.. have installed replacement air bag on drivers seat. repaired the harness then had to replace the sdm as well to have unit functioning... All in...	5
	1997 Geo Metro LSi 1.3L 3rd gear starts VIN: 2C1MR2297V After the two initial occurences, the problem has not reoccurred. It has been determined that the failsafe gear is in fact third gear on this trans, which makes no sense to me. However, since the condition has not occurred since, it has been impossible to de...	5
	1994 GMC K1500 Sierra SL 5.7L Poor Idle Quality, Hesitation, Surge sorry it took so long to close this post,we used this truck as fill in work.as for the low bias voltage the problem was a bad voltmeter which sent me down the wrong diagnostic path, anyhow i still suspected a bad ground problem and i welded a ground strap to a...	9
	1998 GMC K1500 Sierra SL 5.7L No Start, Poor Idle Quality, Misfire VIN: 2GTEK19R0W Thanx to all who have offered their assistance.I had checked and rechecked everything---OK. I hooked up the scope to check the distributor sync and make sure it was spot on with number one.I was only getting 3 waves of crank per 4 of cam sensor. Yep. A v-6 rel...	20
	1998 Oldsmobile Silhouette Premiere 3.4L alternator VIN: 1GHDX03E7W since battery terminal replacement and cable end cleaning no problem since experienced from customer	9
	2004 Oldsmobile Alero GX 2.2L All VIN: 1G3NK52F14 The torque converter was the cause of the vibration.	3

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