iATN Member GM Auto Repair Tech Exchange for June 27, 2008

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Open Help Requests for GM

	Help Request	Answers
	1992 Cadillac Eldorado 4.9L Surge, Cuts out I have this Eldo that cuts out bad 1000 to 1400 RPM and only in that range. You can power brake it and in that range it tries to jump out from under the hood. Below that range or above it runs fine. And it has to be under load, it won't do it just revving it t...	View
	1997 Cadillac Eldorado 4.6L no communication This has been a frustrating vehicle. Came in running with all the lights on the dash flashing and the info center was saying theft sys problem, service airbag, and every other problem that the ipc can think of. I cannot communicated anything through my scanner...	View
	1996 Chevrolet Cavalier 2.2L ipc Replaced IPC with GM reman, installed new ign tumbler and pass key sensor w/ key. Relearned VTD code. STart problem ok now, but still have erratic lights on, ABS lights come on possibly when ABS motor test should run.	View
	1998 Chevrolet Astro 4.3L No Start thanks in advance for help, another mechanic here replaced intake gaskets for a coolant leak, now won't start, rechecked dist timing, has normal fuel press, excellent spark, will run with propane, have injector pulse when checked with led style test light but ...	View
	1999 Chevrolet Suburban 5.7L Glass I can not find any information on how this electrocromatic rearview mirror system on this suburban works in either Mitchell or Alldata (the owners manual does tell what buttons to push) or how to diagnose when it does not work which it does not. The left outsi...	View
	2001 Chevrolet Prizm 1.8L detonation i have a 2001 chevy prizm , 1.8 liter toyota engine , that spark knocks badly upon acceleration, there is no egr system on this car to check, checked compression, and there is no leakage between cylinders , we have cleaned carbon out with engine cleaner, and v...	View
	2003 Chevrolet Venture 3.4L compressor Wow!!! Thanks for any help given guys,(and gals). Anyway. I seem to be falling short diagnosing this one. a/c is full of freon. Control head was recently replaced due to a blower switch problem. The problem is that I am not getting voltage to the compresso...	View
	2003 Chevrolet Monte Carlo 3.8L MIL Lamp on Hey there fellow Techs. I am in need of help. This Monte Carlo came in the other day for an inspection. It had a check engine light, so I started checking it out. P0410 is what I found, so I first checked all the TSBs, and found one that said water was getting... Trouble codes: p0410 (Secondary Air Injection Flow).	View
	2003 Chevrolet c4500 dmax .0L speedometer Hello everyone This truck came in with speed inp if you drive 20 mph it shows at the tech2 and speedometer that you going 45 mph,i thought maybe speed sensors are bad so i replaced them both,vss and output shaft speed sensor,but it didn`t helo,checked abs for ...	View
	2003 GMC Safari 4.3L vibration cusomer took vehicle on vacation. engine light came on 500 miles into trip. bank two sensor one bad . replaced. customer complained of hard vibration in gear at idle. this is so bad that the exaust system shakes sooo bad that a audible resonation can be heard....	View
	1999 Oldsmobile Aurora 4.0L head lights-park lights i have tried to look at all diagnostic charts -failures i am at a stand still?	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Buick Century 3.1L starting Turns out we had two bad brand new batterys. One bad delco and one bad napa battery. Plus our jumper battery is junk. So the third new battery took care of it. Nothing but the best parts! Dont overlook the obvious... We just happened to get some "new" old stoc...	23
	1994 Cadillac DeVille 4.6L Starting The first reply from Jon in Maine was the fix. This car had an aftermarket alarm system that we nor the customer knew about. I took the alarm system out and the car started everytime but the security light was on. I noticed 2 wires going to a toggle swtich. I ...	2
	1999 Cadillac DeVille 4.6L MIL Lamp on accually the 'exp id 140 code' is not a code at all it is a message number for the ip , if you look far enough in the owners manual or alldata it will explain all this. Thanks to all who replied Dale	3
	1988 Chevrolet Corvette 5.7L No Start Thanks for the help guys we do have this one fixed. There are only a few bolts that hold the dash pad on. Once you pull the pad off the module is right there. We pulled the module out and found a suspicious looking solder joint as well as very slight corrosion...	7
	1991 Chevrolet Cavalier 3.1L No Start thanks for all suggestions, fix car with ignition switch. had supply power in run and crank but would lose in run position after a few seconds. contacts were burned.	17
	1993 Chevrolet Corvette 5.7L engine thank oyu to all those who responded. i appreciate your help in finding the solution. there were two problems, the first problem the radiator was partially plugged, and the second the computor was not telling the primary fan to turn on at times. iflushed the r...	26
	1995 Chevrolet Corsica 3.1L No Start No luck on this one. Injectors tested 12.1 to 12.3 ohms each. power supply and circuits to ECM are good. Vehicle runs if fuel added into intake. So I am starting from scratch. Pin voltages and circuit tests. I will post something one way or another.	9
	1998 Chevrolet Suburban 5.7L starter drags hot Thanks guy's.I retarded the dist. one tooth and it ran like the timing was to slow also set code for ckp/cmp correlation. Ireinstalled the dist.as it was and checked starter current draw.It pegged my 600 amp gauge. What are the odds that the defective starter ...	13
	1999 Chevrolet Pickup 7.4L Poor Idle Quality, Misfire Well just as my gut feeling told me the plugs were the problem all along. Thanks to everyone who replied. The customer stated the misfire was there before he replaced the plugs and wires, and was more than likely a bad wire or two having never been tuned up i...	14
	2001 Chevrolet Cavalier 2.4L a/c compressor performance We replaced cooling fan motor. Original fan was not spinning fast enough for the amount of current it was drawing. Thanks for the 15 replies. All seemed aimed in the right direction	15
	2001 Chevrolet Express 5.7L No Start this van had low fuel pressure. it was at 45. customer has now said he replaced pump with aftermarket one. i put oem in and all is good. thanks for all the inputs.	7
	2003 Chevrolet Express 6.0L ABS Module Well Gentlemen and ladies, this van is repaired. The fix was indeed a failed EBCM. The flash and/or module appears to have been corrupted by installing an aftermarket GPS unit in the vehicle. GM Dealerworld advises that the use of certain GPS units can cau...	4
	2000 Pontiac Grand Am 2.4L Cam Supports Thanks to all for your replies, This vehicle remains a mistory. We ordered all parts from GM to remove, check & replace the cam supports. After one week, the customer came in to inform us the oil leak completely stopped and would not need to pursue the issue. ...	3
	1994 Saturn SL 1.9L MIL Lamp on Thanks to everyone that helped. Everyone pretty much said the evap and egr solenoids were at fault here . Also stated that the new pcm had to be programmed . I went back and redid my diag . I was still sold on the bad ... Trouble codes: 26 (quad driver failure), 27 (quad driver fault).	7

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