GM Automotive Technicians Technical Discussion and Fixes for Aug 10, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1996 Buick LeSabre Custom 3.8L 4th converter slip at 650 rpm VIN: 1G4HP52K2T Please help me!! I have a 96 LeSabre that will set code 1870 and shows converter slip at 60 mph at 650 rpms, If I put the trans into 3rd gear then the slips drops down to about 50-70 rpms. I have replace the valvebody with an A/C delco one, replaced the t/conv...	View
	1999 Buick Century Custom 3.1L door glass VIN: 2G4WS52M3X customer (little old lady)states that every mornig she starts the car the left front window goes down automatically.she says it will go back up with button.She has been asking about this for six months and we have never been able to duplicate the problem	View
	1994 Cadillac DeVille Concours 4.6L Connector VIN: 1G6KF52Y6R Hello, I'm hoping one of you can help me. I've got a Cadillac with the Northstar engine taken apart for head work. The cyl head bolt threads came out with the bolt on several holes. After three weeks at the machine shop (first try the inserts pulled out) we f...	View
	2002 Cadillac Escalade 6.0L exhaust noise VIN: 3GYEK63N62 I taken to the dealer several times could not find problem. One thing they have tried is replacing the knock sensor because they thought it was a pinging problem.Drive the truck with moderate load you can here a hissing noise like possibly an exhaust leak insi...	View
	1992 Chevrolet Camaro RS 3.1L No Start VIN: 1G1FP23T3N Hi techs, TIA for any and all responses. Vehicle presented as no start. Fuel pressure and volume good. Spark weak. Replace broken dist.cap and burnt rotor. Spark now good. Still no start. Move onto injector pulse. None. Check power, battery voltage on both sid... Trouble codes: 34 (Map sensor too low)	View
	1995 Chevrolet Lumina 3.1L Stall VIN: 2G1WL52M85 This car will bog when you try to accelerate with cold engine. I replaced the fuel pump, filter and regulator with no help the fuel pressure did not go up and car runs the same, has any one had trouble with new parts on these thanx in advance for any help you ...	View
	1996 Chevrolet Cavalier LS 2.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1JF52T6T Car came w/check eng. light on and off.scan sys multiple miss fire code,po300 runs fine above idle,has rough idle seems likr slight miss at times, has new delco p/plugs ign module coil housing and boots.performed motor vac. on fuel sys,no change.02 reads 250-6... Trouble codes: P0300	View
	1997 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY2260V wonder if i'm missing something here. p1416 sets intermittently for air injection bank 2. code has been very sporatic and right o2 was replaced in hopes for results about 2 months ago. in following the diagnostic routine, air flow from the "hoover" seems a lit... Trouble codes: P1416 (air injection bank 2)	View
	1998 Chevrolet Lumina 3.1L starting VIN: 2G1WL52M8W customer came in with #7 5amp fuse blown. we changed the fuse, customer had no problems for 2 weeks, came in for an oil change, fuse blew, would blow everytime we tried to start. checked with mitchell, fuse is powered by ignition switch in which the yellow wir...	View
	1999 Chevrolet Tahoe LS 5.7L Misfire, MIL Lamp on VIN: 1GNEK13R9X This custumer has a intermitant miss fire problem ,it was suggested to him that it was in the distributer ,but it had a new one at 50,000 KM. Is there a problem with these distibuters .The miss can not be atributed to one cylinder and it sets code po 300 for r... Trouble codes: P0141, P0161, P0300, P1345	View
	1999 Chevrolet C2500 5.7L Mechanical VIN: 1GCGC33R6Y this has been our trouble vehicle, got it almost right . The trans works perfect shifts great but the customer complaint is that it won't upshift from 3rd, you have to back off the throttle a little and it wil go into 4th with a clunk. We made it do this, 130k...	View
	2000 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Misfire VIN: 1GCEK14T5Y This truck came to us with a dead battery and a drain. I do not know how well it ran before but the owner says in last 6 months has not ran as good as before. The truck would not idle for quite a while after we charged the battery. He also complained the ECM B... Trouble codes: P0300 (random missfire 4 cylinder has highest counts)	View
	2001 GMC Jimmy SLE 4.3L abs light VIN: IGKDT13W51 hi guys this jimmy is giving me trouble the code is p0237 rear speed sensor erritac this truck had the four rotors cut because of a bad brake pulsation replaced ebcm for another problem did a wire repaire as to tack to see if the light would come back on if it...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1992 Buick LeSabre Custom 3.8L No Start, Cuts out, Stall VIN: 1G4HP53LON It has been over a week since the crank sensor was replaced. We have not heard back from the customer, so I'm calling this vehicle fixed!! Thanks to everyone who took the time to help!! Trouble codes: 17 (RPM Signal Problem).	22
	1999 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1G4H952K6X The #1 coil tower had excessive rust and corrosion. I want to thank all who responded. All your suggestions were helpful. I hope I can help you all someday as well. Thanks again. Tim Trouble codes: P0300 (Random Cylinder Misfire).	15
	2000 Buick Park Avenue 3.8L a/c compressor VIN: 1G4CW54K1Y Hello everyone, looks like we have got the buick fixed. I will tell you this class 2 serial data is a tough issue. We were never able to actually identify a module that was losing comm. with the scanner. Since all the problems seem to stem from the instrument ...	4
	1998 Cadillac DeVille 4.6L air suspention VIN: 1G6KD54Y9W This vehicle is fixed. All four of the techs that replied, gave us excellant advise. Alfred from Florida stated that there is a delay in the system. This can affect testing, you have to wait at least 20 seconds for the system to activate after sensor is moved....	5
	1984 Chevrolet Corvette 5.7L reverse VIN: 1G1AY0789E I removed the manual and OD unit together and sent it back to the biulder so he could put it on the dino. he found somthing wronge inside and fixed it and sent it back but before I could find out he ran off on vacation for two weeks. when he comes back I will ...	3
	1995 Chevrolet K1500 5.7L Electronic VIN: 2GCEK19K85 Thanks to Justin,Bernard,Lane,and Larry. I got lots of good information. Some years I can switch the valve body and wire harness other years I can not. I think the best way to go is to get a 1995 or get a GM rebult.	4
	2000 Chevrolet C3500 5.7L Electronic VIN: 1GCGC33R6Y well it's been gone a week and the problem it came in for i fixed, but now we have a new one just started, I will post it later. Thanks for the replies , it seem this is not a common problem. We looked hard at the code diagnosis and found the only common thing...	4
	2002 Chevrolet Silverado 3500 6.6L engine VIN: 1GCJK391X2 We found the exhaust gasket blown out on the right side manifold.The noise that we were hearing was the multi layer gasket vibrating. We had to machine the manifold flat and now all is well.	8
	1998 GMC Savana 2500 5.7L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1GTGG25R9W Well the Van Is fixed. We installed a new ground wire between the PCM and #4 injector. Some where in the wire harness that wire Must have been squashed or chaffed because when the van warmed up it grounded the injector and just dumped fuel into #4 cylinder. Wi...	4
	2003 GMC Sierra 2500 HD SLE 6.6L air conditioning VIN: 1GTHK23173 Thanks to all for the massive response. The one question that I had was answered. The question was, 'does GM have an inherent problem with this vintage of truck and does system performance normally suck'? The overwhelming response was that the systems that you...	45
	1997 Oldsmobile Silhouette 3.4L Cuts out, MIL Lamp on, no power VIN: 1GHDX06E4X Thanks to all that replied. Found engine wiring harness frayed to map sensor. Also found injector wiring harness frayed. Looked as if intake gaskets were replaced recently and probably caused concern. Thanks again to all for the help. Trouble codes: P0108, P1635, P0108.	3
	1998 Oldsmobile 88 Royale 3.8L Electronic VIN: 1G3HN52K4W Well it turned out to be a bad connection at the firewall connector. We could not find it for several days and then it just quit all together. This connector was not in the alldata diagram. Customer caled late this pm and said all was still working and she got...	7
	1999 Pontiac Sunfire SE 2.2L timing chain VIN: 3G2JB5243X This one is finally almost behind me. Because of the hole eaten throught the #3 combustion chamber we obviously had to get another cylinder head. We had it pressure checked and a valve job done and put it back together. It starts and runs fine now with the exc...	18

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