GM Automotive Technicians Technical Discussion and Fixes for Dec 1, 2004

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Open Help Requests for GM

	Help Request	Answers
	1991 Buick Century Custom 3.3L heater VIN: 1G4HAH54N4 i have a problem with no heat if the vehicle idle for a short time ido get heat but after test drive for about a mile it blows cold air i replaced stat heater core flushed cooling system removed restricker from line removed water pump noing found it will be ba...	View
	1995 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52L7S When this car came in the complaint was the Service Engine Soon light was on. Code number P0342 triggered the Service soon light. I found a problem at Black/White (C terminal on Cam Sensor) wire where it would show battery Voltage but wiggling the wires I wou... Trouble codes: P0342 (cam signal circuit)	View
	2000 Buick Century Limited 3.1L MIL Lamp on VIN: 2G4WY55J7Y Hi everyone! I'm afraid I do not have much information about this vehicle! We have two 2000 Buick Centuries afflicted with the same problem. The first customer would stop by the shop every week or so after long driving trips because the check engine light woul... Trouble codes: P1189	View
	1990 Cadillac Seville 4.5L Misfire VIN: 1G6KS5334L When this car came to us the customer was having an intermittent misfire mostly noticed at 40-45 in OD on slight accel- so, basically lugging the engine. 2 fuel injectors had already been replaced and after testing, the other 6 were way out of spec. We replace...	View
	1989 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality VIN: 2GCEC19K1K Have this pickup that has been all over town and no one has been able to fix it. it recently had engine rebuilt as well as transmission replaced several weeks ago. the original customer complaint was that the idle is high and intermitently while slowing to a s... Trouble codes: 24 (vss circuit problem), 43 (esc circuit), 45 (system rich)	View
	1991 Chevrolet Corvette 5.7L Starting VIN: 1G1YY2380M Engine starts, but then immediatly stalls. There is good spark whill cranking, good fuel pressure, injectors are pulsing. I have replaced ignition module and coil with known good parts. Also have replaced ignition switch and lock. There are no codes present an...	View
	1996 Chevrolet Cavalier LS 2.4L poor idle VIN: 1G1JF52T2T Hello everyone and thanks in advance for the help on this one. I picked up this car from a salvage yard with a bad engine. The engine had been overheated severely, pistons scored and the head badly warped. I disassembled the engine, had it honed, installed n...	View
	1996 Chevrolet Blazer 4.3L headlights VIN: 1GNCT18WXT Hello to all & TIA for looking this message over; I haven't pin checked the DRL module because of its location inside the dashboard (2.6 hr to get to it & replace). The Daytime Running Lights themselves work correctly (low voltage sealed beam bulbs); DRL's are...	View
	1997 Chevrolet S10 4.3L Fuel Gauge The fuel gauge on this vehicle reads full all the time. I started checking at the sending unit, it's putting out about 2.5 volts which seems consistent to how much fuel is in the tank. Next I went to the fuel gauge buffer. It had a good battery power source, g...	View
	1997 Chevrolet Express 3500 5.7L engine VIN: 1GCHG39R4V Please help. I have not been whipped like this in a long time. This heating and Air Van came in for routine maintenace while owner/driver was out of town. We changed oil, front and rear brakes. All went well. Van was left at owner/drivers house until his retur...	View
	1999 Chevrolet Malibu 3.1L coolant in oil VIN: 1G1ND52J3X i just need second thought. car came in lossing coolant last few days keep adding coolant every day.i check and notice leak at breather hole from water pump.but that leak was not bad as cutomer stated adding half gallon every day.i replaced water pump, there i...	View
	2000 Chevrolet Impala 3.4L MIL Lamp on VIN: ZG1WF55E4Y Car came in with po401. Relaced EGR, no help. Replaced MAP sensor, no help. Ckecked for blockage in EGR port, found none. When comand EGR open with scaner Idle goes to poor as normal, and MAP voltage goes up as normal. Can find no blockage in pipe going to EGR... Trouble codes: P0401	View
	2001 Chevrolet Silverado 3500 8.1L brake pedal VIN: 1GCJK39G51 Hello everyone, Customer scheduled this truck for a rear brake adjustment. Truck has four wheel disc and are not adjustable. Brake pads all have at least 70% left, and truck stops great. I called the owner and he said yea but my pedal is low, (it is) and with ...	View
	2001 Chevrolet Silverado 2500 6.0L Timing cover/water pump VIN: 1GCGK29U41 I have a question for the GM guys. I have this truck with what looks to be a coolant leak at the timing cover! Is there coolant flow behind the cover? It looks like there shouldn't be, but I haven't had the pleasure of taking apart a 6.0l yet. I'm assuming the...	View
	2002 Chevrolet Cavalier LS Sport 2.4L wss code VIN: 1G1JH52F32 Hello group Sorry for the long post this caviler was brought in with abslight on originally. Sympton happen after car was driven through deep water. Retreived codes and found c1235 left rear wheel speed sensor shorted or open. pinpoint testing took me to abs m...	View
	2002 Chevrolet Tahoe LS 4.8L alley lights VIN: 1GNEK13VX2 Good evening to all and thanks for reading and responding to my post. The car in question has code 3 mx 7000 light bar for traffic stops etc. The right side alley lights are out and I am having a very dificult time getting access to the light. I am hoping that...	View
	1999 GMC Sonoma SL 2.2L Hesitation, Cuts out VIN: 1GTCS1444X truck came in with a hesitation and MIL illuminated. checked plugs, were good old bosch platnum +2. number one took some threads out with it, so we replaced all the plugs and fixed the #1 plug hole. Put back together and still missed. found the injector for #1... Trouble codes: P0300 (random misfire)	View
	1999 GMC Savana 2500 6.5L turbo VIN: 1GTGG29F4X hello fellow tech's! this vehicle has a whistling or you may call it a whineing sound under load which sounds like it is eminating from the turbo charger. - it almost sound's like some alternator's whine when under extreme amperage demand. - only thing we have...	View
	1999 GMC Sierra 1500 SL 4.8L No Start VIN: 2GTEC19V6X GREETINGS FROM NORTHERN ONTARIO,CANADA, PROBLEM--THIS TRUCK WILL NOT START OUTSIDE IN THE COLD. IT FLOOD (WET PLUGS) EVERY TIME NOW. PUSH IT INSIDE TO WARM UP FOR A FEW HOURS AND IT WILL START WITH A FLIP OF THE KEY, OR AFTER IT HAS BEEN RUNNING. GO BACK OUTSI... Trouble codes: P0101 (maf sensor performance), P0108 (map sensor cirt.high voltage), P0157 (o2 b2 s2low voltage), P0158 (o2), P0300 (misfire detected), P0336 (ckp sensor performance)	View
	2002 GMC Sierra 2500 SL 6.0L Long crank time VIN: 1GTGK29U32 Hi Group, Sorry in advance for the long post. This GMC truck has presented a real chalenge. I starts fine cold, and will start fine hot immediatly after it is shut off, but if left to sit for 10 min or longer it will crank for at least 5-10 seconds before sta... Trouble codes: P0160 (Low O2 activity bank 2 sensor 2), P0140 (Low O2 activity bank 1 sensor 2), P0300 (Random misfire)	View
	2000 Oldsmobile Intrigue GL 3.5L Slip or extended shift VIN: 1G3WH52H4X The complaint is an odd or extended shift in city driving at operating temp. This is an intermittent problem that we have not duplicated. The customer says it is most likely to happen after two or more short trips and at speeds of less than 45 MPH. The problem...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1992 Cadillac DeVille 4.9L door locks VIN: 1G6CD53BXN I checked all wiring, and finally found that there is a door unlock switch in the trunk on this car. The switch is located right next to the latch, where dirt and other debris can accumulate. This switch was stuck in the activated position. Replaced and proble...	3
	1985 Chevrolet S10 2.5L plug in for panel VIN: 1GCCS14E2F Thanks for the advise, this s-10 just needes the dash wiring replaced customer said to wait till spring to try again	3
	1995 Chevrolet Astro CL 4.3L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GNEL19W9S Hey all just an update on the Astro. We checked everything possible Air/Fuel/Ign. All checked out fine. Customer decided he has spent enough money on the vehicle and decided to check the cam timing himself. I really feel that he will find the camshaft is a too...	18
	1996 Chevrolet Cavalier Z24 2.4L Poor Idle Quality, Surge VIN: 1G1JF12T4T got 9 replies!! most called it right, fix was new computer. my customer didnt have the money for a new one so we got a used one for it, after installing it the surging went away, but the dash lights all stayed on and the tach didnt work, on the road it had lot... Trouble codes: P0507.	13
	2001 Chevrolet C3500HD 6.5L Reverse VIN: 3GBKC34FX1 Thanks to everyone who responded. Most replies indicated the direct clutches, but it turned out to be the low/reverse band as I had suspected. Upon further testing, all forward gears were fine and there was no trans braking in low. Checked servo, but found no ...	9
	2003 Chevrolet Express 3500 6.0L instrument cluster VIN: 1GCHG39U43 Thanks all for your help. I checked all wiring for any chaffing concerns and could not find anything. I replaced the ignition switch. This customer is on the road for extended periods of time. He said everything was fine for a few days then it acted up again. ...	12
	1995 GMC Sonoma SLE 2.2L Poor Idle Quality, Hesitation, no power above idle VIN: 1GTCS1942S Well fellows This sonoma is no longer at our place, owner told me that he had truck at another shop for the same problem. He said they installed new injectors,did not help, he drop the convertor off himself, this did not help. Did not want to spend the money t...	15
	2003 Oldsmobile Alero GL 2.2L No Start VIN: 1G3NL52F73 Well, the customer didn't even want us to replace the battery much less do any testing. They're going to do the battery themselves and drive it for a while. It seems that the ignition switches and cylinders are common to fail but I never could get it to act up...	6
	1998 Pontiac Sunfire SE 2.2L Cuts out, Misfire VIN: 1G2JB5245W Vehicle is out the door. I had 4 replies, one for checking engine brain corrision, one for checking harness rub, one for vcm replacement, and one for ignition switch. I tried a used vcm and got the same result, checked the engine brain and all looked ok inside...	4
	1998 Pontiac Grand Prix SE 3.8L supercharger VIN: 1G2WP521WF thanks guys for the great help, especially Tom [...], who offered several ways to service the supercharger. We detected the bad nose bearing with a stethoscope We ended up getting the nose bearing kit, and a coupler from ...	23

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