GM Automotive Technicians Technical Discussion and Fixes for Jan 13, 2005

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	Help Request	Answers
	1989 Buick LeSabre Limited 3.8L wipers VIN: 1G4HR54C4K the windshield wipers on this car do not work. i have replaced the wiper motor temporarly. this did not fix the problem. im looking for the fuse block to check the fuse. but the only fuses i find are the 2-15 amp 1-20 amp and some relays all on the same block ...	View
	1993 Buick Regal 3.1L Excessive Emissions VIN: 2G4WB54T1P Hello, This vehicle came to us as an emission failure. Tailpipe emissions for CO were 3 times the state limit. We replaced the O2 sensor, which was dead, cleaned out the egr passages, and retested and only got a modest improvement. The lower intake manifold ga... Trouble codes: 32 (EGR Malfunction)	View
	2000 Buick Century Custom 3.1L Gauges, shift ind. light VIN: 2G4WS52J4Y I replaced ign. switch about a week ago because of no start condition & gauges & speedo not working. Came in today, (starting ok, but gauges inopertive). Ck'ed all fuses. Power & grds at IP connector & DLC (OK). Scanner does not comunicate with ECM. Is this po...	View
	1997 Cadillac Seville SLS 4.6L dash lights VIN: 1G6KS52YXV Dash lamps do not come on when any full spectrum lighting is available. Inside the bay the lights work correctly, under a cover the lights work correctly. By putting black tape over the photocell the lights worked correctly. We replaced photocell but it did no...	View
	1987 Chevrolet R30 Custom Deluxe 7.4L No Start VIN: 1GCHR34N4H hello and good day. engine will not start-no injector pulse. this truck will not control injectors. strange thing is that if i spray just a small amount of carb cleaner down throttle body,the injectors will start to spray and truck will run fine. sometimes tru...	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 Express 2500 5.0L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCFG25M5T Fist problem was miss under load,ignition parts oe and cooked.complete tune up fixed.2000k later shows up smokin oil and missing.A/f ratio perfect,stays in open loop,o2 reading stays at 460 even when I try to change it.Thought press. reg. at first because this... Trouble codes: P0134, P0135, P0300	View
	1998 Chevrolet C1500 Cheyenne 5.7L Stall VIN: 1GCEK19ROW Customer brought truck in complaining that it dies once in a while. He said it has died after start up with a cold engine and a couple of times when backing up from parking spot. I scanned the computer and no codes were present, no pending codes either. I chan...	View
	1998 Chevrolet Astro 4.3L abs? VIN: 1GNEL19W9W Hi all, this all wheel drive van will lose brakes altogether every once and a while. Probably 1 in 10 tries. The pedal gets hard, doesn't go to the floor, just gets hard, no brakes at all. You can push with both feet and nothing. I almost took out the shop doo...	View
	1999 Chevrolet Tahoe LS 5.7L air bag VIN: 1GNEK13R2X came in with code b1021,b1026 resistance high . data resist. 50.1 ohms - replaced slock spring - now getting code b1022 resist. low. data .9 ohms removed clock spring and all connectors and terminals look good - removed module uder driver seal and wiring and c...	View
	2000 Chevrolet Corvette 5.7L Traction controll VIN: 1G1YY32G1Y I have a problem with the traction controll turning on at various times for no reason and stays on while car slows. I can turn it off with button and car will work fine.When scanning ABS system to look at wheel speeds I noticed that the front reads slower than...	View
	2000 Chevrolet Venture Warner Bros. 3.4L Cuts out, ACTS LIKE ON REV LIM VIN: 1GNDX13E6Y Hello fellow techs. Not really sure if this is a drivability problem or a trans problem. Van was at a shop getting a new intake gasket installed. When they were done and test drove it, they noticed that the van, under wot would reach rev limit speed (3600 rpm)... Trouble codes: 1811 (Max. adapt and long shift)	View
	2002 Chevrolet Tahoe LS 5.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNEK13Z62 Hello, this tahoe is running like crap. it acts like a egr problem. I cant find a egr valve on it. bank #2 is almost totally dead. i have fuel trim readings of -15 on bank # 2 and +10 on bank #1 all indications piont towardssome kind of vacuum leak. Are there ... Trouble codes: P0300	View
	2003 Chevrolet Silverado 2500 HD 8.1L auto 4wd VIN: 1GCHK29G43 truck will intermittantly illuminate service 4wd lt.code that sets is bo790 fault in neutral crkt of transfer case.from info that i gather lt only sets when vehicle is not commanded in transfer case neutral postion.flow chart says that system monitors neutral ...	View
	2003 Chevrolet Silverado 2500 HD 6.6L abs VIN: 1GCHK24123 Got a good one here. I talked my brother into a Chevrolet truck. He found an this and bought it 2 weeks ago. Loves the truck. Hates the abs system. When he goes to start it sometimes the ABS light/brake light will not go out. Turn it off never moving a thing o...	View
	2004 Chevrolet Silverado 1500 4.8L cruise control VIN: IGTEC14X64 I need to add cruise control. I was hoping some gm tech's could tell me how and what I might need to do this. This is a fleet truck but is driven by the manager on long trips and he would like cruise. can it be factory done. add the cruise feature blinker arm ...	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
	1995 Oldsmobile Aurora 4.0L Poor Idle Quality, MIL Lamp on VIN: 1G3GR62C1S Vehicle ran very rough,idle @1500rpm,test and replaced 3 ignition coils,runs smooth,idle at 950 rpm.Code 85 will not go away,throttle body was removed and cleaned,no vacuum leaks are present,while driving rpm's will increase on thier own and car will go about ... Trouble codes: 85 (throttle body cleaning required)	View
	1993 Other GM allegro bay 7.4L power steering fluid VIN: 1GBKP37N3P This motor home has a problem in the hydro boost system. The fluid cavitates and foams up from air, then your steering and brakes quit working. We replaced the pump and still mave the same problem. There are no fluid leaks visible. If you drive it 4 or 5 block...	View
	1994 Pontiac Grand Prix SE 3.1L Misfire VIN: 1G2WJ52M7R hey fellow techs, this grand prix will run perfectly for @ an hour and then it will start misfiring. if you keep driving you'll end up on the side of the road for a couple of minutes and then it'll start and run just fine for another 45 minutes. no codes. fuel...	View
	1995 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 3G2JB1248S attn GM techs. I am working on a 95 sunfire, 2.2l. This car has no driveability except a mil light.This is not a regular cust so I have very little in the way of previous work or symptoms. According to alldata, this code originates via egr solenoid or evap sol... Trouble codes: 27 (quad driver failure)	View
	1995 Pontiac Grand Am SE 3.1L unknown VIN: 1G2NE55M65 Hi guys, Got a weird one here. I must be missing something. This vehicle recently started to over heat. You can leave car in shop for a hour running and it might get hot enough to turn fan on once. I drove car uphill 6 miles, let it idle in shop an hour, then...	View
	2001 Pontiac Grand Am SE 2.4L Inst cluster,radio. VIN: 1G2NF52T61 Hello everyone. The 2001 grand Am we have has an issue with the inst cluster and radio. All guages will sweep while driving down the road,all dash warning lights will come on also.The engine never misses a beat.The radio also goes out.We have not been able to ...	View
	1993 Saturn SL 1.9L Poor Idle Quality, MIL Lamp on, HIGH IDLE VIN: 1G82H5596P Complaint is that engine does not idle down during decleration. I origionally misunderstood the complaint as a high idle, checked codes found MAP volts too low. Verified that MAP was 0.95 @ idle. Cleaned the IAC port and checked for vac leaks - none found. I w... Trouble codes: 26 (quad driver)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Buick LeSabre Custom 3.8L engine, trans,body VIN: 1G4HP54K5Y Hi to all, well the Buick wobble problem was finally solved. As we suspected at first...bad c-v axle... we removed the new axles we had just installled ( reman units) and installed a set of 'GM' axles and the problem was solved! Thank you all who took the time...	5
	1993 Cadillac DeVille 4.9L heater VIN: 1G6CD53B5P Thanks for your replies. It was the heater core plugged. The diagram in [...] was misleading. The ducting is seperated into two parts. The core flow seemed normal but after pulling core out I can see why it gets plugged (poor design?). Thanks for all your r...	27
	1989 Chevrolet Celebrity 2.5L Stall VIN: 1G1AW51R4K Finally had time to work on this one. I installed a new ecm and prom. I drove the vehicle for three days with no problems. I want to thank everyone for their input. It was very helpful.	21
	1991 Chevrolet Lumina APV 3.1L Excessive Emissions VIN: 1GNCU06D3M thanks everybody for the responses to this problem rodger from alberto hit it after running an engine run compression test we noticed that the compression would start out good and slowly go to nothing after pulling the head it was found that the exhaust valves...	11
	1993 Chevrolet S10 Blazer Tahoe 4.3L Poor Idle Quality, Surge, Stall VIN: 1GNCS13W9P THanks to everyone that responded to my help request. Many of you recommended that I remove the EGR Valve, and clean/check for carbon contamination. I removed the EGR Valve an found no pieces of carbon stuck on/in the EGR Valve. Regardless, I cleaned off the E...	23
	1995 Chevrolet C3500 Cheyenne 6.5L engine VIN: 1GBKC34FOS It took some exploring, but after removing the left head, I saw that for some reason, the # 7 piston was hitting the head. When I installed the piston, I measured deck clearence and got .010'. I don't know why, but now I measure .025'. The old piston was not m...	13
	1998 Chevrolet Malibu LS 3.1L blower,windo VIN: 1G1NE52M2W we replaced the ign switch and the locl cyl. we had the new lock cyl keyed to the original key. we turned the egine over till it died and left the switch on for 10 min. and the anti tft light stopped flashing. the car started fine . thanks, mark	7
	1998 Chevrolet Venture 3.4L cooling system leak VIN: 1GNDX03F9W Hay everybody! I would like to think all who replyed to this queestion. I have taken the intake off and i did find that the intake gasket at the rear head was blowen. I have yet to put it back togather and see if it fixes the problem or not but I am almost s...	44
	1999 Chevrolet Astro 4.3L Fuel Gauge VIN: 1GCDM19W4X This vehicle is fixed, no doubt. We never could duplicate the roundy, roundy of the gauge in the shop, however seemed to read wrong, based on the customer information about fuel level. Customer wanted us to try a new fuel sender first, so, we did, no change, g...	6
	2002 Chevrolet Silverado 1500 5.3L washer pump VIN: 2GECEK19T3 hello again well the washer pump dosent run while in 4 wheel drive any more but the fix was not done by me i will tell you what the customer told me he said a friend of his looked it up on the net and got a procedure for this prob he said you turn the left sig...	3
	1994 GMC Jimmy 4.3L No Start VIN: 1GKCT18WOR Its fix!!! I like to thank everyone who replied,John and Kenneth where on the right path.The blue wire from the injector was not grounding? I was going the wrong way through the wiring.But I knew the ecm was good. The red wire had voltage but when,the no start...	18
	1996 GMC Sonoma SLE 2.2L Misfire VIN: 1GTCS1943T guys thanks alot and sorry it took so long to get back with fix...couple of you suggested sticking valves which i couldn't verify or rule out so as some suggested i removed valve cover and watch the vale train while running and found a broken spring ... thanks...	13
	1997 GMC Jimmy SL 4.3L Head Gaskets VIN: 1GKDT13W5V Well this one has fixed it's self for now. It hasn't acted up for almost a month now but I have a feeling it may be back. Thanks for all the great replies. One of them states that my steady air bubbles may be because of a corroded impeller on the water pump....	12
	1996 Pontiac Grand Am SE 2.4L No Start VIN: IG2NE5103V vehicle came in no start again 2 days ago. noticed coolant low when toped up last time. removed cap & noticed pressure. installed pressure tester & cranked engine pressure increased by 5 - 10 psi . removed plugs , cranked engine & no pressure increase. pumped ...	18
	2001 Pontiac Grand Prix GT 3.8L Mechanical VIN: 1G2WP52K01 First thanks to all who replied, the suggestions were very helpful. It was NOT the Balancer or the Timing components. The customer had oil change prior to bring his vehicle to us. After a good beating customer finaly said he did not have problem until he had o...	6
	1998 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5274W Hello again, This Saturn went back to the dealer to check on a TSB for the code P0133. TSB #99-T-66 as provided by Bill [...] relates to that code involving a PCM reflash and O2 replacement. The only difference is the TSB showed for a 99 Saturn and a federal e... Trouble codes: P0133 (o2 signal slow bank 1 sensor 1).	7

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