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Miss fire

Tiny
JLANE89
  • MEMBER
  • 1999 VOLKSWAGEN PASSAT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 165,000 MILES
When my car miss fires its when I have it turned up to 10 lbs of boost. I have replaced all spark plugs and coil packs. The funny thing is. It will take to boost at half throttle, when I punch it at the same amount of boost the car starts like jumping. I know its running lean. Do you think that affects the when I punch it. Is it not getting enough fuel. Or is is my 02 sensors. Or could it been my catalatic convertor being plugged.
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Wednesday, January 12th, 2011 AT 4:35 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 POSTS
It it is running lean, you're going to end up burning a hole in a piston. Keep in mind, you are already running lean. When you open the throttle plate the entire way, you are allowing it to run even leaner, so my guess is that is the problem.

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Friday, February 18th, 2011 AT 10:37 PM

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