GM Automotive Technicians Technical Discussion and Fixes for Aug 8, 2005

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	Help Request	Answers
	1992 Cadillac Eldorado 4.9L cluster, AC controls VIN: 1GEL13B1NU hi group- I hope someone out there can steer me right before I waste more time with this beast. This caddy came in with the Fuel mileage computer and the AC controls showing dashes "--". Well first thing I did was search the archives, and found these cars to b...	View
	1995 Cadillac Seville STS 4.6L Cuts out, Stall, Gauges go Haywire VIN: 1G6KY5293S Customer complaint is that when driving 15 to 20 miles the Speedometer and Tachometer sweep to "full" then back to zero, then reset and the air conditioning system goes to 75 degrees and has to be reset for the air to work. It seems to be losing power for a mo... Trouble codes: T085	View
	1998 Cadillac DeVille 4.6L abs/traction lights VIN: 1G6KD54Y4W someone please help this car is driving me crazy i have replace the control module and the ws sensor on the rr for the code c1228 excesive wheel speed right rear. I noticed that the rough road parameter stays at .995 now and when I did the first repair it woul...	View
	1988 Chevrolet S10 2.5L Mechanical VIN: 1GTC32XP92 Do the timing gears ever go on this gm 2.5L motor? And is it an interference motor? This truck was overheated many times and we had to replace the head due to cracks. The motor is rather noisy and its not a specific noise I can point to, sound like it could be...	View
	1990 Chevrolet Beretta 3.1L Unknown VIN: 1G1LVTXLY1 My beretta had developed and intermittent coolant leak after short term driving. A pressure test of the system shows no obvious signs of leaking. Gauge does not indicate overheating. Replaced the radiator cap and system seemed OK for a couple of days. But the ...	View
	1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L module faults VIN: 2G1FP22P1P Hey Chevy guys. I just bought the car and took a trip to PA. I took my modis along just to moniter everything. On the way up I noticed a rough idle at a rest stop. Had injector fault on bank 2. Also oil temp was -34. On the way back inj fault did not reappear ...	View
	1994 Chevrolet Corsica 3.1L unknown VIN: 1GILD55M6R Vehicle came in for AC service per not cooling. Evacuated system, found full charge R134a. Compressor coming on, cycling as expected. All components warm to the touch. Pressures normal at 30/180 at 90 ambient. Radiator fan coming on normally. Customer notes AC...	View
	1995 Chevrolet K1500 5.7L Electronic VIN: 2GCEK19K85 I have a 4L60e in this 95 pick-up. The trans is not rebuildable. I called local salvage yards and they tell me only a 95 trans will work,because the electrical connector is 95 only. My question is can i use a different year trans and put the 95 wiring harness ...	View
	1995 Chevrolet G20 Chevy Van 5.7L rear suspension VIN: 1GBEG25K8S Hello all, This vehicle has a thumping noise in the rear axle or spring area that sounds and feels similar to a motor mount thats broken. The noise happens when comming to a stop just as the vehicle settles, or when braking down hill after comming to a complet...	View
	2000 Chevrolet Blazer LS 4.3L suspension VIN: 1GNDT13W4Y Hello, Another shop had replaced the pitman arm and steering gear box that had play in it. Customer is hearing a loud clunk from the front when in reverse and turning sharply. It will do it on turns to both sides. you have to be in reverse , turning and braki...	View
	2001 Chevrolet Silverado 1500 5.3L Excessive Emissions, No Start, Hesitation, Poor Fuel Economy VIN: 2ECEC19T7Y Now the plugs are soaked and the cylinders are also put new plugs in and the cranking time of 1 minute they are soaked again. 1. the maf reading still jumps around from 5g/s to 13g/s steady crank,the inj pw jumps from 5.5 to 29 while cranking the map sensor vo...	View
	2001 Chevrolet Express 1500 4.3L Stall, INTERMITTANT STALL VIN: 1GCFG15W91 VEHICLE WILL STALL COMING TO STOP FOR DRIVER, I HAVE DRIVEN OVER 30 MILES WITH NO STALL PROBLEM, ALL SCAN-DATA LOOKS GOOD AND WITHIN SPEC, THESE VEHICLES ARE WELL MAINTAINED AND DRIVEN WELL(no hard drivers), THERE WAS ONLY A U1016 CODE IN BODY MODULE FOR LOSS ... Trouble codes: U1016 (loss of comunication)	View
	1997 Geo Tracker 1.6L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 2CNBJ18602 I have this Geo Tracker with MIL illuminated, code P0102. MAF voltage reads 0.0v on scan tool. I performed circuit tests as per MOD. Blue/Black wire has 10-14v, Gray/Black wire has 0.4v. All indications by this test show MAF as faulty. There is no mention of t... Trouble codes: P0102	View
	2000 GMC Sonoma SL 4.3L MIL Lamp on VIN: 1GTCS19W2Y Hi. 2000 Somoma P/U 4.3 failed NYS Insp due to 410 code. 108K miles, runs alittle rough (could use T/U) but don`t believe that is source of problem. Both front ox sensors (original) seem to work/respond well and toggle low to hi, rear ox sensor moves but stays... Trouble codes: P0410	View
	2002 GMC C-Series Topkick C6H042 7.2L No Start VIN: 1GDJ6H1C02 Received no start Heui has 250 psi at crank - needs 850. New reman from cat along with injection pressure control valve. 250 psi at head and dead head heui @ 250 psi, even with the control valve unplugged. Fuel pressure is 0psi at crank No ECM cummunication -p...	View
	1992 Oldsmobile Toronado 3.8L Misfire VIN: 1G3EV13LON I seem to be having a problem that I thought was going to be a piece of cake! I have a engine miss under load that I cant find. After replacing the plugs and wires (Orignal) I found the crankshaft sensor was loose in its bracket and hitting the dampner shutter...	View
	1998 Oldsmobile Aurora 4.0L Lighting VIN: 1G3GR62C2W The original lamp module #[...] melted the connector to the parking lamp input terminal. Replaced unit with new one and replaced connector. Replacement repair lasted one year, now the same terminal is melted again. Has no aftermarket equipment on that circu...	View
	2000 Oldsmobile Intrigue GL 3.5L No Start VIN: 1G3WS52H8Y No crank, no codes, no power to the starter soleniod when key is turned to start. Security light goes off after key is released to the on position. Starter Soleniod does not click. Master Tech data does not show a change in Crank request (always says no). If I...	View
	1984 Pontiac Firebird Trans Am 5.0L Surge, Cuts out, Stall, Misfire VIN: 1G2AW87H1E The customer brought it in with this note:The car will be running Ok and all of a sudden the tach will go from 2000 to 0 and the engine will backfire out the exhaust and smoke will come from the carb. and it will surg terribley. sometimes it will satrt running...	View
	2002 Pontiac Grand Am GT 3.4L Pads/rotors VIN: 1G2NW12E22 Has anybody had a pesky noise on this sytle of Grand Prix? The noise is not there when the car is on the lift and the bearings have no play or codes. I've checked the splash shield and it is clear. This problem seems simple but this noise simply won't go away....	View
	2002 Pontiac Grand Am GT 3.4L front right hub VIN: 1G2NW12E22 noise was heard under twenty miles an hr. went away after appling the brakes . a visual showed to have worn pads . replaced them and machined rotors and noise was gone. five weeks later and 1500 hundred miles a simalar noise returned . but aplying the brake no...	View
	2000 Saturn SL2 1.9L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G8ZK5272Y cust states that engine stalled after cold start one morning. must keep feet on brake and throttle when come to stop or engine will die. using snap on scanner, engine will not respond to idle up or down command. 1ac counts are approx 140 when engine is idling ... Trouble codes: P0506, P0509, P1599	View
	2001 Saturn SC1 1.9L MIL Lamp on VIN: 1G8ZN12801 Grettings fellow Technicians. I have 2001 Saturn with your 1.9L engine, SOHC. When the engine starts, she idles up to about 3-4'000 RPM's and remains at that speed. If I disconnect the IAC, the high idle remains the same. I used a Solus, MT200 and Mentor,,, al... Trouble codes: P0500, P0507, P0509	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick Skylark Gran Sport 3.1L No Start VIN: 1G4NM15M9R here it is...thinking i have compression (always use a professional tester) i a friend that use to work for a gm dealership listen to engine. he said something is the matter with compression it sounds like the 3800 when they would wash the cyclinder walls with...	46
	1995 Buick Riviera 3.8L abs/traction control VIN: 1G4GD221XS I am not able to close out this one, the car has not been returned. I recieved 3 replies , Robert and Gury have seen power supply issues and relay [abs and pump relay] problems that could cause problems. Also to check the wiring near the a/c drier, could be ru...	3
	1978 Chevrolet C20 Cheyenne 5.7L Governor sticking? VIN: CKL248F356 I had several good replies. From checking the sprags and center support, to even having a democratic transmission. I liked that one best. The actual problem was I failed to clean cooler properly. After removing valve body and flushing system again, It got dece...	13
	1993 Chevrolet S10 Blazer 4.3L No Start, Poor Idle Quality VIN: 1GKDT13W0P I would first like to thank each and every one of you who took the time out of your busy schedules to offer your help to fix this troublesome vehicle. And, I'm happy to report that it is fixed. A GM pump fixed it. The majority of responses said to check for a ...	26
	1997 Chevrolet Astro 4.3L power steering VIN: 1GNDM19W1V Well after checking that I had no ps pressure and reading all the posts of ps pump shaft breakage, I pulled off serp belt and sure enough pump shaft pulled right out. I replaced pump and all is well. Sure is nice to have willing people give us a hand on cars. ...	15
	1998 Chevrolet K2500 Cheyenne 7.4L long crank time VIN: 1GC0K00JOW This truck is fixed now,with thanks to all who replied Stephen,Floyd,and Dan you were right about that 'pinch' i have been doing that for years with succes but now have been burned on it.Ron was right with the 'bad parts' idea,seems like i get too many of thos...	8
	2000 Chevrolet Malibu LS 3.1L Surge, Poor Fuel Economy VIN: 1G1NE52J6Y I had a couple of good replies suggesting scored cylinders / pistons and bad cam bearings could cause spark retard at cruise. I wanted to replace the sensor as the first step to diag this problem, BUT the customer's wife traded the car. She has been living wit...	3
	2001 Chevrolet Express 3500 5.7L Compressor VIN: 1GBJG31R82 The vehicle had an aftermarket rear a/c system installed. It had been wired incorrectly on the initial install. The side condensor fans would not come on as designed by the coach company. I rewired it according the the manufacturer and it worked great. Aldata ...	3
	2000 GMC Savana 3500 6.5L Stall VIN: 1GTHG35F9Y i replaced the module and crank sensor as recomended and the van has not stalled, thanks again!!	3
	1992 Oldsmobile Cutlass Ciera 2.5L Poor Idle Quality, Hesitation, Surge, Stall, MIL Lamp on VIN: 1G3A154R8N A special thanks to Kevin, Alex, Jimbo, Gene, Todd, and Mike for your help responces. Like I said in my original post I had replaced the EGR valve. I had also replaced the MAP sensor. Some of the posts suggested a fuel injector problem. The pulse width looked ... Trouble codes: 144 (Lean exhaust).	7
	1993 Oldsmobile Cutlass Ciera 3.3L Excessive Emissions, Hesitation thank you for help,problem was dirty mass air flow.fixed emis. probl.block learn changed sig. .this is not the first one i have seen and will not overlook again ,thanks again	11
	2000 Pontiac Grand Prix GT 3.8L drl,radio and ac blower motor VIN: 1G2WP12K5Y Thanks everyone for the tips. It was the ignition switch. Installed new switch and all accessories working properly.	12

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