GM Automotive Technicians Technical Discussion and Fixes for Oct 18, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1978 Chevrolet Corvette 5.7L inner axle stub VIN: 1Z87C8S402 car came into shop about a year ago after customer jacked up car and noticed right rear wheel tipped out at top. on hoist you could see shaft was coming out of differential. removed diff from car and dissassembled to find shaft was 2 seperate pieces.the small ...	View
	1993 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GCDC14K9P We received this vehicle from another shop which had rebuilt the motor and can not get it to idle correctly. The TBI injectors seem to be pumping in too much fuel at idle. we have replaced the following components: MAP sensor, TPS sensor, Temp sensor, ECM and ...	View
	1995 Chevrolet S10 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCCS1926S alot of sensors were replaced before the vehicle was brought in. From checks, the engine would run lean and run pretty good if the MAP sensor is disconnected. Fuel pressure is good and within specification. Does not loose fuel pressure. I am at my odds with th...	View
	1995 Chevrolet K1500 Cheyenne 5.7L 2-3 and 3-4 shift VIN: 1GCEK14K7S Hi gm trans guys this particular trans will upshift to third at light throttle but at half throttle and above it will not upshift unless you let up on the accelerator, and will not take 4th gear. All scan data seem normal and there are no dtc's . Any help will...	View
	1997 Chevrolet Blazer 4.3L r/f suspension VIN: 1GNDT13W8V vehicle came in with ball joints bad - diagnosed at other shop. we shook down front end - also found bad hub bearings & confirmed bad ball joints. changed out all four ball joints & both hub bearings. after repair, during test drive, noticed heavy pop/creak ...	View
	2005 Chevrolet Silverado 1500 5.3L fuel tank VIN: 1GCEK14Z35 Has any of you run across this problem, I remember reading something about it in a trade mag. but we cannot find it now. This truck is slow to fill with fuel, it will take about a 1/2 hour to fill. when we first started working on this problem, it had a MIL w/...	View
	1995 Geo Tracker LSi 1.6L Excessive Emissions, No Start VIN: 2CNBJ1867S hi guys'i need help!the owner replaced water pump but left tensioner loose,after sitting for 4 weeks he says he towed it to us,redid the hole timing belt but no start,rechecked all timing marks,ok, it gets tomuch fuel ,if i disconnect the wiring harnas to the ...	View
	1996 GMC Yukon SLE 5.7L brake pedal VIN: 1GKEC13R2T This truck came in with a dropping brake pedal. When you apply the brakes the pedal sinks to the floor the brakes stay applied but it is not a good feeling to have. Performed a brake inspection and found the master cylinder was leaking between it and the vacuu...	View
	1998 GMC K1500 Sierra SL 5.7L wheels/steering VIN: 2GTEK19RXW When driving it shakes violently (TIRES, STEERING WHEEL) at times and NOT others. I had disconnected the sensor at the P/S pump, NO change. Front end GOOD, tires GOOD. Is it possible to be the sensor at the base of the column? I have read posts with similar pr...	View
	2000 GMC Jimmy SLE 4.3L heater VIN: 1N9US161XX Vehicle brought in with no heat condition. Checked fluid levels all good. T-stat is opening. Heater hoses warm but not hot. Vehicle does not over heat. Blend door motor working. I am going to flush the system and install new heater hose outlet that comes out o...	View
	2001 GMC Yukon Denali 6.0L No Start VIN: 1GKEK63U01 I had the battery disconnected while I rebuilt the transmission and now engine will not start. I get code B2961 key in ignition fault. The engine will start and die with starting fluid. If I clear the code it comes right back before trying to start the engine.... Trouble codes: B2961 (Key in ignition circuit malfunction)	View
	2002 GMC Envoy SLE 4.2L No Start, electrical VIN: 1GKDT13S32 Hellooooo Techs.this envoy originally came in for passenger side door lock inop,pass side climate control stays cold. door panel was removed & door lock actuator wires tested for signal. none their both grey & tan wires grounded all the time. looking at the sc...	View
	1998 Oldsmobile 88 Royale 3.8L excessive crankcase vaccum VIN: 1G3HN52K4W cust. brought car to shop, engine overheated. removed intake and cylinder head's. brought cylinder head's to machine shop. valve job done and heads planed. install heads, new head gasket's. install new plenium and intake gasket's- old plenium bad where water t...	View
	1993 Pontiac Grand Am SE 3.3L No Start VIN: 1G2NE14N8P vehicle came in cranks but no start. no inj. pulse, no spark, no rpm on scanner. found pigtail to crank sensor had bare wires touching. repaired with new pigtail, still no start. ohm tested each wire from icm to crank sensor plug with no resistance and manuall...	View
	1998 Pontiac Grand Am GT 2.4L MIL Lamp on VIN: 1G2NW12T9W This car came in about 2 weeks ago with a very bad miss problem after checking it out I determined the coil housing cover had failed so I replaced it and that took care of the miss. The car is back now with a check engine light on and a PO420 code for three wa...	View
	2001 Pontiac Sunfire SE 2.2L fuel injection sistem inop VIN: 4317416626 Intermitent anti theft ligth comes on and when is on engine cranks but won't start[becasuse fuel sistem is inop.any help will be appreciated.javier.	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Cadillac Seville SLS 4.6L Starter VIN: 1G6KS54Y4Y I dropped the trans pan after another tech in Downey CA said to check the plastic clip for the manual shaft, sure enough the plastic clip must have worn and allowed the rod to fall off of the arm. The trans was in drive and the shifter was in park. This was a ...	7
	1965 Chevrolet Corvette 327CID overheats VIN: 194675S022 Well hopefully my nightmare leaves tonight, the new heads and rebuilt motor seems to have solved my problem.At least it runs really good customer should be happy.Thanks again for all the great response.	54
	1973 Chevrolet CORVETTE 5.7L low pedal VIN: 1Z37J3S408 found out that car had 3 different master cylinders installed, but don't know if right one was. told customer that with calipers being 14 years old (as far as he could remember) we were going to start witn new calipers, new master cylinder and possible work on...	23
	1991 Chevrolet Camaro RS 3.1L starting VIN: 1G1FP23T1M we found the problem was with the distrubitor, the reluctor had broken loose from the distrubitor shaft causing it to fire at the wrong time, thanks for the many replies...joe	9
	1996 Chevrolet Blazer 4.3L Oil Contamination VIN: 1GNCS13W2T Well guys, I would like to thank you all for your replies. just about all of you said lower intake gasket. You all were right. thanks alot. I installed new gasket and pressure tested and all is good.	35
	1996 Chevrolet Blazer 4.3L speedometer VIN: 1GNCT18W7T Thanks to all of you who replied to our post. The owner of the vehicle moved out of the city with their truck, so we didn't get much of an opportunity to do further diagnosis on it. We did inspect and clean the egr valve as many of you suggested, but we didn't...	7
	1998 Chevrolet Venture 3.4L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GNDXD6E1W Thank you, to all that replied. Everyone had good points to consider. I double checked everything and finally concluded my diagnostics with the information listed in the GM section of technical resourses... Shutoff Valve Assembly - Located in the tank, the s...	15
	1999 Chevrolet S10 2.2L No Start, Cuts out, Stall VIN: 1GCCS1442X Sent this over to the local dealer and they WERE able to program the used computor and all is working great at this time. Thanks foe the replies and hope this will save some else some money along the way. Trouble codes: U1016, P1629.	3
	2001 Chevrolet Express 1500 5.0L MIL Lamp on VIN: 1GBFG15M41 Thanks to all who replied this van is fixed. After all that I did to it the intake gaskets were the problem. When I got the intake off you could see that the gasket was worped down like a U on #4 and 6 Trouble codes: P0300, P1381, U1041.	9
	2004 Chevrolet Trailblazer LS 4.2L starter VIN: 1GNDS13S54 Thanks for everyones help..We put an Ignition switch in and it started right up.. Customer picked up and haven't heard a beep from them..Good sign... Thanks again	7
	2004 Chevrolet C4500 Kodiak C4C042 6.6L No Start VIN: 1GBE4C1134 Thanks for the ideas to look at, I double checked everything that was replied. Ended up just being a priming issue. This thing was exceptionally difficult to get going. Once we got it mostly primed, we could hear it firing on 1 or 2 cylinders. It took lots o...	4
	1996 Geo Tracker 1.6L Excessive Emissions, No Start, Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 2CNBE1360T Thanks to all who responded. I finally found the problem. Put OEM fuel pressure regulator on vehicle with no change. Re checked compression, which was good. Check exhaust back pressure which was 0, checked vacuum which was around 12 inches. Removed timming cov... Trouble codes: P0300.	7
	1997 Geo Tracker 1.6L MIL Lamp on VIN: 2CNBJ1365V Thanks to all that replied. We had some real horror stories here, some replies stated that the egr passage snakes around through the intake, and would be difficult to clean. Although the system passed all tests, a clog was the issue. This intake has no passage... Trouble codes: P0400.	11
	1996 GMC C1500 Sierra SL 5.7L Stall VIN: 1GTEC19RST thaks all it was oil pressure switch dont know why it flooded but it runs fine now	13

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