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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 4, 2005
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1998 Cadillac DeVille 4.6L Misfire
misfire under load. No.5&6 cyl. no codes.Has new plugs and wires. We tried a new module and coils but no help. Injectors ohm good , cant find any vacuum leaks. I swapped plugs & wires with other cylinders but it stays with 5&6. the problem has been presant for...
1999 Cadillac Catera 3.0L MIL Lamp on VIN: W25466RWEW
does any one or has any one encountered this problem before . if so could us a couple leads to try. thank you. Trouble codes: P0442
1980 Chevrolet El Camino 3.8L control lever VIN: 1W80KAK404
Does anyone have any diagnostic or troubleshoot info for the cruise sytem on this vehicle? [...]
1985 Chevrolet Corvette 5.7L Hesitation, Stall VIN: 1G1YYO782F
Hello gentlemen, First this guy is very particular. I did not notice the symptoms right away. When you accelerate the pedal less than full throttle it seems to catch fine and the vehicle moves foward. When you mash the pedal to the floor, it seems you hear or ...
1988 Chevrolet P30 Step-Van 7.4L No Start, Misfire VIN: 1GBKP37W0J
About 10,000 miles ago this motorhome started to burn up ignition rotors every 500 miles like clockwork. It will start to miss like there is a bad wire and then after it is turned off, it will not start until a new ignition rotor is installed. After the rotor ...
1988 Chevrolet S10 Blazer Sport 4.3L hard start VIN: 1GNCS18Z9J
scan data (snap on scanner)reads 414 degrees farenheit with coolant senser plugged or unplugged. yellow wire has 5 volts + plugged or unplugged. no voltage on the black wire .i cut the yellow wire 2 inches from the ecm and still have 414 degrees. ground the ye... Trouble codes: 14 (coolant temp too high)
1993 Chevrolet Caprice 5.0L Excessive Emissions, Surge, Misfire
This one is for someone that may have done some high preformance work before or any advice would be a great help. This car/truck is a 93 chevy caprice 5.0 with a 40 ford p/u body. the owner forgot to tell me this. he just said 93 chevy, i figure no one else wo...
1993 Chevrolet K1500 Cheyenne 5.7L excessive pinging VIN: 2GCEK19K8P
excessive pinging on light to moderate throttle starting at 25 mph to 65 mph worse when engine to operating temp. sparkplugs have appx. 14000 miles since replaced.I have tried all brands and grades of fuel no change.all tests on modis appear ok, no trouble cod...
1994 Chevrolet Lumina APV 3.8L temperature control VIN: 1GNDU06L9R
Hi everyone and thanks in advance for any and all help with this problem.Customer complaint is temperature fluctuation.Supposedly happens every couple of minutes when driving on highway.We have road tested on highway for about one hour total and has only happe...
1996 Chevrolet Cavalier LS 2.2L speedometer VIN: 1G1JF5247T
vehicle come with crank and no star condition we found the crank sensor wire loose from ecm repair the wiring and inspect the rest car stars but the speedometer does not work the costumer have the same problem before he replace the complete speedometer but it ...
1997 Chevrolet C1500 Cheyenne 5.7L fuel VIN: 1GCEC19R6V
about a week before christmas, customer brought in truck for intermitent no start condition. customer talked toanother garage and was told cam sensor was bad. installed cam sensor, it ran for a week. installed crank sensor, it made no difference. then installe...
1997 Chevrolet S10 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCCS1440V
truck has rough idle. was skipping irratically on cylinders # 1 and # 4. fouled out new plugs, replaced. we can take the wiring harness on the passenger side that goes to the computer and move it and the truck will idle smooth. we have found 2 bad wiring conne... Trouble codes: P0172 (fuel system rich)
2000 Chevrolet Astro 4.3L Hesitation VIN: 1GNELI9WXY
To all Techs. I have been work on this vehicle for fews days, getting no where, I apreciate with support and advise. Customer drove vehicle into shop, complaining the van giving hasitation when the temperture on coolant reach to 200 degree, especially cruising...
2002 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Cuts out, Stall VIN: 3GNEK13T42
When cold start engine will stall iac will not pick up rpm. If you hold pedal down some will run fine. After a minute truck will run on own. Iac counts will be anyware from 0 to 310 with no difference in rpm. Dosent set any codes. When i control iac with scann...
2002 Chevrolet Suburban 1500 LT 5.3L fog lamps VIN: 1GNFK16Z42
fog lamp relay is activated by body control module to turn fog lamps on, fog lamp switch was replaced (did not correct problem)all relay wiring ok, switch signal at bcm on orange wire ok when fog lamp switch pushed, when dk green with white tracer wire from bc...
2003 GMC Sierra 2500 HD 6.0L transmission VIN: 1GTHK24U03
I have this mysterious noise coming from this transmisson. Put up on the hoist and there is a severe clicking noise coming from the transmisson. It increases in frequency when the engine is accelerated. pulled inspection cover and all torque converter bolts ar...
1992 Oldsmobile Achieva S 2.3L sparks VIN: 1G3NF51D7N
Before and after all other repairs blue, audible spark noticed jumping from timing cover to crank pulley. appears to be secondary ign. Spark is intermitant but when it occurs it seems to be consistent( about every 10-12 sec. at idle, freq. increses with rpm) V...
1995 Pontiac Bonneville SE 3.8L Surge, Stall, MIL Lamp on VIN: 1G2HX52K7S
the car cam into the shop about 2 weeks ago. with a cold start up problem. intermittenly on a cold start-up the check engine light will come on, along with the traction control light. and a irratic idle surging up and down, and the car would almost stall, and ... Trouble codes: P0341
2000 Pontiac Grand Prix GTP 3.8L RF door speakers VIN: 1G2WR5217Y
Hi group, have this Gran Prix with the speakers not working in the RF door. I've tested all the wiring and have ended up at the amp hanging in the trunk. Has any one else had this problem and please confirm the fix before I spend the $300 on the new amp. Thank...
2001 Pontiac Aztek 3.4L abs VIN: 3G7DB03E61
Get a code C0045 ( left rear speed sensor)on the first start of the day. Switch key off and back on its fine. Have run the scanner and monitored the speed sensors..everthing is fine. Any common problem with this code? Thanks, Dave

Fixes & Summaries for GM
Fix/Summary Answers
1987 Buick LeSabre Custom 3.8L No Start, Stall VIN: 1G4HP5437H
Well its fixed. 13 replies, most of you said the car will runwith a bad cam sensor. some said it wont. This car ended up having multiple problems. I followed the no start procedure from aldata.While checking the crank sensor I noticed it had became partially p...
1988 Buick Regal Limited 2.8L No Start, Stall VIN: 2G4WD14WXJ
Sorry guys, my customer STILL hasn't brought this rig back in to run through all the excellent replies you guys have provided. The general consensus is that there's at least one injector shorting out, which is causing the quad drivers to shut down the system. ...
1999 Chevrolet C3500 7.4L Excessive cranking VIN: 1GCGC33J2X
First off thanks to everyone who replied and offered assistance. The key to this fix was not having the right information. Once I was informed by several of ya'll that 3-5 psi was too much I traced it down to leaking injectors(2-cyl 1 and cyl 8). Replaced all ...
2000 Chevrolet Venture 3.4L MIL Lamp on VIN: 1GNDX03E7Y
hi everyone, i'd like to start by first giving a big thank you to all of you that helped me with this chevy. as always, iatn is the best tool in the box... the fix was to replace the e.g.r. valve. my local GM dealer (george) gave me one 'on loan' to try. i... Trouble codes: P1404.
2001 Chevrolet Silverado 1500 5.3L Stall VIN: 2GCEC19T61
sorry fellow iatn members, as i can not post a fix at this time. the customer unfortunately developed health problems and has been unable to return yet. thanks for the input. a summary of the replies follows. 2-3 replies said clean throttle body which would ha...
1990 Oldsmobile Cutlass Ciera 3.3L Hesitation, Misfire VIN: 2G3AL54NOL
Thanks to all who replied, the problem ended up being in the maf sensor. After cleaning it, the problem still existed so I installed a new one and the hesitation went away. The numbers on the scanner didn't change any, but the esitation was gone. Thanks again ...
1996 Oldsmobile Cutlass Ciera 3.1L air bag VIN: 1G3AJ85M7T
Thanks for the replies, as most of you said this is normal for this car. Found another similar car did the same thing, Driven many GMs over the years and never noticed it. Learn something new every day in this business. Thanks again, Bill
2003 Pontiac Aztek 3.4L Front Brake Pads VIN: 3G7DA03E53
We just completed front brakes on a 2004 Aztek using new GM rotors and ProQuiet extreme brake pads. David (Reply #1) had an identicle situation using Raybestos pads and cured the problem using 'EBC' pads. We could not find a local supplier for this brand but d...
2003 Saturn LW300 3.0L timing belt VIN: 1G8JW84R83
thanks a bunch guys, this should be a easy fix now with info from you guys,jeff from alberta you told me exzactly what i need to know, that the marks to use are #1 -#2-#3-#4 starting at rear exhaust came on rear head and count forward one on each sprocket , fr...
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