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Have scan code P300, P0304, P0305, P0306, P0171.

Tiny
ROBERT54
  • MEMBER
  • 2006 FORD FUSION
  • 130,000 MILES
I have check for vaccum leaks none, change spark plugs, and replaced coils. Still get the same engine code, the check engine light came back on after cleared. The engine temp is normal.
Monday, October 15th, 2012 AT 5:45 PM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The system is running lean with random misfres and cylinders 4, 5 and 6 seems to be badly affected.

Which engine do you have?
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Monday, October 15th, 2012 AT 6:53 PM
Tiny
ROBERT54
  • MEMBER
  • 2 POSTS
My engine is V6 3.0L.
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Tuesday, October 16th, 2012 AT 6:15 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Check the PCV valve and its hose for damage and vacuum leakages.The hose may be wrapped in heat protective covering which makes it a little harder to find damage.Your misfires are all on one side of the engine, I would look for something isolated to that bank

Heres a couple guides to check out, they will help you figure it out

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

https://www.2carpros.com/articles/engine-misfires-or-runs-rough
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Tuesday, October 16th, 2012 AT 7:41 AM

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