2002 taurus idle misfire.code PO301 cyl 1 misfire and code PO316 misfire detected first 1000 Rev. Replaced spark plugs and wires still get same codes. 161000 miles. Help

Asked by May 27, 2015 at 06:21 PM about the 2002 Ford Taurus SEL

Question type: Maintenance & Repair

2002 double oh cam idle misfire. Code PO301 cyl 1 misfire. Code PO316 misfire detected
on start uo first 1000 rev.
Replaced spark plugs and wires. Same codes come up.
Above 1000 rpm engine runs smooth and performs well.
160,000 miles on vehicle

5 Answers


Try running some SeaFoam in the fuel tank, it could be dirty injectors.

Worth a try it is fast and cheap.

Tried for a tank of gas did not correct or improve rough idle issue

Since it only misses at idle and runs great above 1000 rpm I decided it must be a vacuum leak. Checked all hoses and pcv valve. They were all ok. Decided the intake manifold gaskets must be leaking. Pulled the upper and lower intake manifolds and replaced rubber gaskets. This resolved the issue. It idles and runs like a new car!


Glad you found the problem, it seems odd that it didn't set a lean code for unmetered air, but stranger things have happened.

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