GM Automotive Technicians Technical Discussion and Fixes for Aug 5, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1997 Buick LeSabre Custom 3.8L speedometer jumps VIN: 1G4HP52K0V Thanks in advance for any help with this car, This car came in originally with an int. speedo jump/dropout, I could not verify the problem on a tst drive, rec: renewing the vss , test drove again with n.a.p. told customer to let us know if it reocccurred, was...	View
	1997 Buick Riviera 3.8L No Start, Stall VIN: 1G4GD22K7V hey gm guys,i have a car thats killing me.this car came in on a hook with a no start as soon as it got here it started and ran fine.customer says it died at a stop light i cant get the car to stall but intermittently,with car warmed up in cloosed loop.i'll dri...	View
	1994 Cadillac Eldorado 4.6L No Start VIN: 21.353 We have a 1994 eldo when starting engine starts runs for 2 seconds then shuts off no injector pulse but spark is ok we keep getting map sensor codes but i believe thats from the engine dieing tryed a nother computer same thing any info would be a great help	View
	1997 Cadillac Catera 3.0L Misfire VIN: W06VR54R1V heys guys doing all the work myself trying to save time and money...hope cadi tecks can help or anyone with cadi exp... car has misfire interm.. and i cant see any misfiresoccurs intermittly..plugs wires look ok but i suspect coil pack.. any one come across th... Trouble codes: P0300 (misfire detected), P0306 (cyl 6), P1113 (intake switchover ckt problem...what is this code for)	View
	1990 Chevrolet Lumina 3.1L No Start, Poor Idle Quality VIN: 2G1WN54TIL Hello there,I need help with this car. Towed in with no start condition we found spark ok injector puls ok fuel pressure low sprayed starting fluid in intake starts,replaced fuel pump,fuel filter,crank sensor,againe no start,sprayed fluid in intake starts but ...	View
	1995 Chevrolet Blazer 4.3L fuel/spark VIN: 1GND145WL8 im hoping some of you techs can help me with this one because i tried everything from following alldata troubleshooting to following grounds to asking dealerships.i probed pins and wires and still i cant get this thing to start.everything i checked pointed to ...	View
	1996 Chevrolet Blazer 4.3L Mechanical VIN: 1GNDT13WOT This Blazer came in for very poor braking. The pedal feels somewhat hard while driving, I was unable to lock the wheels, and fast stops are very difficult without putting your whole body in the pedal. The booster was tested by checking vacuum which tested fine...	View
	1997 Chevrolet Tahoe LS 5.7L Pressure control solenoid VIN: 1GNEK13R3V Hey Guys need some help, this thing has me scratchin' my head. When you first start the vehicle, you can put it in any gear and drive away, but after a few seconds, your stuck, I mean it won't move, it has a faint growl (simular to a power steering pump low on...	View
	1998 Chevrolet Tahoe 5.7L air conditioner VIN: 1GKEXK13RX Hi guys, got a good one for you. Have two general motors with the same problem. Both of them will not get very cold when it gets above 95 degress outside. My duck temp at idle is 68 and going down freeway is very good but it takes it a while. It runs about 42 ...	View
	1999 Chevrolet Tahoe LS 5.7L 1-2 & 2-3 shift VIN: 1GNEK13R1X here goes... after driving on highway for 1 hour when you come to a stop and go, the trans shifts hard for 2nd and 3rd gears. feels like pressure too high. I pulled over and shut off truck. restarted and was back to normal shifting...not too familier w/4l60e t...	View
	2000 Chevrolet Corvette 5.7L directionals VIN: 1G1YY32G34 Hello! This Corvette customer has a complaint of very intermit. directionals (completely not working both sides). I have had this car twice and nether time acted up for Me. I have tried to have customer keep track of when it happens, but she is a little errati...	View
	1991 Geo Metro 1.0L Valve Body VIN: 2C1MR66M67 Hello everyone and thanks for the help on this one. I have this Metro of my own that I have the automatic apart in. I took the valve body apart to have a peek and most of the check balls have actually almost tore through there place in the aluminum passage an...	View
	1991 GMC K2500 Sierra 5.7L compressor VIN: 2GTFK29K3M This may be really simple, but I want advice from you experts before I make an expensive mistake. The a/c symbol on the control head flashes, even with the heat/a/c turned off. All temp control and air distribution controls work. No ground from control head on...	View
	1992 Oldsmobile Achieva S 2.3L ABS Module VIN: 1G3NL146NM when coming to a full stop brakes release for a second right before vehicle is still. doesnt happen very often. sounds like abs motor runs when this happens.	View
	1995 Oldsmobile 88 Royale 3.8L Surge, Stall VIN: 1G3HN52K3S This car came in for intermittent stall,sometimes at idle in park sometimes when coming to a stop.It may not occur for two days.customer says sometimes it will go dead when he starts it in the morning.my tech drove it and had no problem at all ,I drove it abou...	View
	2001 Oldsmobile Intrigue GL 3.5L Stall, MIL Lamp on VIN: 1G3WS52H41 This car intermittently sets codes P1372 and P0385 and turns on the MIL, but it will not act up in the shop. She has had it to the dealer and they couldn't get it to happen, everything checked ok. She is ready to start replacing things or sell the car. I have ... Trouble codes: P0385 (CKP Sensor B Ckt problem), P1372 (CKP circuit)	View
	1997 Pontiac Grand Am SE 3.1L Poor Idle Quality, High Idle Speed VIN: 1GN2NE12M4 Friends, this one doesn't fall into a neat catagory. The symptom is a high idle speed, and after a couple of days of tests and observations, as the engine runs longer the idle speed climbs. It doesn't matter if it sits at idle , or is driven a few miles. The I...	View
	2001 Pontiac Sunfire SE 2.2L Timing chain VIN: 1G2JB12441 I can't figure out the proper way to align the timing chain from the info. in my manual. There is no mark on the cam gear other than a hole in the webbing. The crank gear has a dot like normal.	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1977 Cadillac Seville 5.7L rear air suspension VIN: 6S69R70494 First, thanks for all the help. There was 2 separate problems. The level sensor in the rear is a completely mechanical sensor. The level arm in the 'neutral' or level position does not allow the pressure in the feed line to pass through to the shocks nor does ...	9
	1996 Cadillac DeVille 4.6L Poor Fuel Economy VIN: 1G6KD52Y0T It turns out there was no problem. The customer was doing more short trip driving. This was confirmed by customer taking car on a trip, and getting mileage similar to what was achieved in the past. However, even tho my scanner was lying about the ignition timi... Trouble codes: RF256.	4
	1994 Chevrolet S10 Blazer 4.3L Encoder VIN: 1GKDT13WXR Replaced encoder again and blazer works great. Thanks for the replies, Tom, Steve and Raymond.	3
	1994 Chevrolet Camaro Z28 5.7L engine valve train VIN: 2G1FP22P7R Thanks for all the replies. Clyde hit the nail on the head. We were able to listen closely with a screwdriver up and down the head and pinpointed the area of the noise. Pulled the intake and found the roller on the bottom of the lifter pitted badly and flat sp...	10
	1995 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13WXS This one is fixed! A Rebuilt Computer solved the high bias voltage showing up on the scanner for the rear O2 sensor. Yeah it was a snappy scanner, but I also borrowed another just to make sure. What made me decide on the computer, was in reading about this cir... Trouble codes: P0138.	8
	1995 Chevrolet Cavalier 2.2L starting VIN: 1G1JC1247S Thank you all very much. Opened ECU, found trace water damage(had to look hard), replaced computer. All is fine so far. Thanks again. I would be lost without you all.	5
	1999 Chevrolet K2500 Suburban 7.4L a/c system VIN: 1GNGK26J2X hi, after several hours of frustration and inspecting lines fittings, etc. We decided to remove the front heat/cool assy. to inspect, or possibly pressure test the evap. core. What we found was the core was indeed leaking and the accumulation of dirt and debri...	15

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