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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 19, 2005
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Open Help Requests for GM
Help Request Answers
2000 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP54K8Y
This car came in about a month ago with a P0300, original plugs and wires, so we changed those first. Back again today with the same code. Cylinder #1 misses between 4500 and 5500 RPM, consistently. Freeze frame info. confirms this in the past as well. Swapped... Trouble codes: P0300 (Multiple Cylinder Misfire)
1998 Cadillac DeVille 4.6L Hesitation, Cuts out VIN: 1G6KD54Y1W
Hello Fellow Techs, This is one is really acting wierd somtimes intermittently this car(my Fathers) he will be driving along and all of a sudden it will start to cut out and start to hesitate. It will also not be able to accelerate. After he pulls over and wai...
1985 Chevrolet Corvette 5.7L Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1G1770786F
Ok lets get started. This is a friends wifes car. Motor was rebuilt this year. From what I have been told it ran fine for awhile thin started to miss and stall. I get and this is ths list of new parts that were on it, New cap, and rotor. 8 new fuel injectors. ...
1996 Chevrolet K2500 5.7L No Start VIN: 2GCEC19M11
truck had a bad engine , replaced and now it wont start.tried everything, new distributor,timing is good , check 3 times, fuel pressure is good, has spark , pulse, but only 2 injectors ar firing 1 and 8 ,tried reflashing,did not work,no codes, everything looks...
1999 Chevrolet K1500 Suburban 5.7L Security Light VIN: 1GNFK16R6X
Problem is Security Light began to intermittently come on, now is on always, however vehicle has never exibited any failure to start, or "start & die" symptoms. This will happen when either of the 2 keys they have are used. I have just ordered the new Snap On ...
2000 Chevrolet Cavalier 2.2L Steerinig VIN: 1G1JC5242Y
Hello All Fellow Techs This Cavilier came in with a poppin noise with turns. I thought it would be the lower control arm bushing but with an in spection they are ok. The popping noise is in the steering shaft or rack. It will pop at about 90* turn to the left...
2000 Chevrolet Malibu LS 3.1L dash gauges and lights go dead VIN: 1G1NE52J0Y
hey guys and gals, got another intermittent problem that's giving me fits. the car will start and run w/ no problems. it may run like this for days but it will eventually stall...sometimes while driving, sometimes after a hot soak. the first time i scanned it ...
2001 Chevrolet Blazer LS 4.3L Loss of Coolant VIN: 1GNDT13W11
Have tested for external leaks and exhaust leaks in cooling system with no results. See some moisture on oil filler cap but no coolant mixed with the oil. Are there any GM Techs that have seen this, I think it might be an intake gasket leaking into the engine ...
1996 GMC Safari 4.3L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1GDDM19W8T
dropped frame and engine- replaced with used unit- after changing everything possible and reinstalling engine and frame- no small task-- it now has a very rough idle- and miss, the scan data shows history miss fires on cyls # 3-4 -5-6 but # 4 is currant to the... Trouble codes: P0300
1995 Pontiac Trans Sport 3.8L Surge, Misfire VIN: 1GMDU06L1S
this van runs perfect at idle off of idle runs perfect till the engine comes under load like in overdrive up a hill it will go into the most violent shake & miss if i push the gas to the floor to kickdown it will go but under mid load you would think the engin...
1995 Pontiac Grand Am GT 3.1L No Start VIN: 1G2NW55M3S
Complaint was hard start cold. At first it would not start or would start and die. It did this once and then started and kept on starting and running, but it would idle bad and stop, but would easily restart. Had code 17., cam crank correlation problem. Confir...
1997 Pontiac Grand Am SE 3.1L Surge, Poor Fuel Economy VIN: 1G2NE52MIV
auto shows no reading on snapon mt2500 scanner for mass air flow sensor. it has 12volt on yellow wire 5volt on pcm + and good pcm -.at maf. there is no codes.car runs like it is starving for fuel.especially on accel or climbing a hill. it has new plug wires pl...
2000 Pontiac Grand Am SE 2.4L ABS module VIN: 1G2NF52T3Y
Hello and thank you Service Vehicle Soon light is on. The Mitchell only has a test procedure for U1000 & U1255 together. The only code present is U1255. This test says to check for communication with all class 2 serial data modules. I have the Snap On scanner...
1997 Saturn SL1 1.9L Poor Idle Quality VIN: 1G8ZG5288V
This vehicle had come in in the past for the same problem, and at that time we didn't have time to dive into it. Recently the customer went on vacation and dropped the vehicle off to be checked out. Symptoms: high, hanging idle only when coming off a shift...v...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick LeSabre Custom 3.8L Hesitation, Surge, Cuts out VIN: 1G4HP52K8W
theysaid to look at o ring it was losse becase of other garage did not fix it right thanks to everone jim Trouble codes: 1106 (map sensor voltagehigh).
1993 Chevrolet G20 Chevy Van 5.7L brakes VIN: 2GBEG25K1P
Many thanks to all who replied. Most replies backed up my initial suspicion that the brake hose was restricted. I suggested brake hoses to our tech the first time around but we never followed through- lesson learned.
1993 Chevrolet G20 Chevy Van 4.3L no speed signal VIN: 1GBEG25Z1P
I found the battery had fallen from the rusted tray and spilled enough to corrode the body ground. After a new tray and ground repair, all is OK. Thank you all for the helpful tips, at least I know where to find the ECM.
1998 Chevrolet Lumina 3.1L starting VIN: 2G1WL52M8W
The lumina is fixed. The transmission range switch/neutral safety switch was grounding out internally. My tech was able to determine that when shifting from drive to park, would pop the fuse. He was able to force it to pop. Thanks to Roger from Alberta who was...
2002 Chevrolet Silverado 2500 6.0L ac belt VIN: 1GCHC24U62
I installed the new ac compressor, accumulator, orfice tube and flushed the system. Now the belt makes absolutely no noise and the tentioner rides smoothly without banging around. Thanks to all who took time to help.
2004 Chevrolet Astro 4.3L awd VIN: 1GCDL19X14
Thanks for the ideas. We tested motor worked well when we reinstalled motor and the light turned off. unsure of what was going on we are thinking that there is a fulty pin in connector
1997 Geo Tracker 1.6L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 2CNBJ18602
Three replies to my request talked about the MAP sensor vacuum being possibly clogged, the crank pulley being loose causing timing issues, and one about wire colors. I did all the wiring checks before posting my help request and the MAP sensor and crank pulley... Trouble codes: P0102.
1987 GMC Safari 4.3L Timing marks VIN: 1GTDM15Z4H
Hello, Thanks for the responses. Nobody who replied said that this same thing had ever happened to them, but several people agreed with my prognosis that there was something of interest inside the timing cover. We pulled it apart and found that the cam gea...
1992 Oldsmobile Toronado 3.8L Misfire VIN: 1G3EV13LON
Thanks for all the help. I was doing all my testing of the coils with all the wires off at once. I tested th 3-6 coil with the engine running and found that anything off idle would kil the spark. By moving the crankshaft sensor slighly I could get the spark ba...
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