Chasing misfires and need help

hotcobra03

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02 testing. Read all of it.

There are some test you can do to see if vacuum leak is cause
For rich fuel trims by adding short and long trim


Fuel filter? Last time changed.

Compression test.

These 2 things will also effect trims that don't actually have codes


Also does this scanner do engine running self test. ?
 

Badaz01

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I had this problem once and it ended up being broken ringlands on two pistons but then again I had a D1 on 10 lbs with a stock bottom end. Oh and my plugs had oil on them to in the bad cylinders.
 

Boost or Bust

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That is a option, but I hope not. The bearings blew on the idler pulley that is mounted to the supercharger on Saturday. So while that is being repaired my mechanic is chasing the miss. The car is not burning or blowing oil so I hope I get this season on the stock bottom end. I will know in a day or so what’s going on. But since we are talking about it, anyone run a mod max bottom end?
 

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