missfire on light throtle load
#1
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missfire on light throtle load
Hi i hope some one out there can help me. I have a 4.3 manuel chevrolet s10. i am having problems with my truck. I keep experiencing a missfire when under light throttle load. I can be cruising down the road and go to pick up speed again and around 2-3000 rpm i get a missfire and load pops and bangs out the exhaust. if i push harder on the throttle it will clear and will be ok and drive alright. It just seems to happen when i am on light throttle. If any one has any ideas i will be greatfull
Thanks
Thanks
#3
Custm2500's Rude Friend
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First off, what year is it??? 4.3L Has been around a long time.
I had one with a broken Cap do something similar because it would not latch down tight. When we put a tiny c clamp on it, it went away....
And another one with a crank sensor Issue... GM has a TSB about that one.
Basically the o ring that keeps the sensor spaced away from the crank wears out from the heat. If it does not maintain the correct distance specified it causes a miss fire. I believe the distance was 1 Mil
I had one with a broken Cap do something similar because it would not latch down tight. When we put a tiny c clamp on it, it went away....
And another one with a crank sensor Issue... GM has a TSB about that one.
Basically the o ring that keeps the sensor spaced away from the crank wears out from the heat. If it does not maintain the correct distance specified it causes a miss fire. I believe the distance was 1 Mil
#5
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I had the same problems with my 93 Grand Am. It had a 3.3L V6 with about 80k miles. It ended up being the ignition coil pack. The damn thing kept going out every 5 or 6k miles or so. I never got to the bottom of it though. I sold it when I graduated college and I bought my 2001 Zr2 Blazer.
If it is not the coil pack, check to see if it is not the fuel injectors. Sometimes they go bad and stop sending fuel to its respective cylinder.
Good Luck
If it is not the coil pack, check to see if it is not the fuel injectors. Sometimes they go bad and stop sending fuel to its respective cylinder.
Good Luck
Last edited by kidreno_21; 01-05-2009 at 12:30 AM. Reason: forgot to add the type of engine my grand am had.
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If that doesn't solve the problem, you may have a bad injector poppet valve. There are two ways to solve this, hopefully you have number one. You can take it to a dealership or local shop and they can run high pressured nitrogen (not oxygen, O2 is more flamable than N) and push the poppets and blow all the gunk out. The second is to replace the injector spider, and that can be a pain. Hopefully it doesn't come to that.
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