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misfire cylinder 4

Infinity08

Well-Known Member
Joined
October 29, 2007
Messages
550
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City, State
Charlestown, IN
Year, Model & Trim Level
'08 Sport Trac LTD
I had my codes pulled earlier, and I have a misfire on #4. The sheet said plug, coil, or vaccuum leak. I have plugs to do a full change, and I guess I'll get a coil, but where would I look for the vacuum leak?
 






I'm not sure what codes you got but I've been getting 302 and 303 missfire (backfire?) codes. I put in new plugs, thought I had a bad coil, replaced one, then it hit again on the same #3 cylinder. Opened it up and it was smoking. Brown every where. Oil leak. The valve cover gasket is leaking and oil seeps in there and shorts out the plug. Pretty sure it's on both sides, passenger side is the worst leaker though.
 






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