P0302 Cylinder 2 Misfire from Hell!!
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Junior Member
Joined: Mar 2018
Posts: 1
P0302 Cylinder 2 Misfire from Hell!!
I have a 2004 Ford Expedition XLT 4.6.
I loved it! Ran great until the misfire!
I replaced the spark plug, coil (twice), and injector. I still have the code and it’s still misfiring which is causing the stumle at idle and anything below 2000rpms.
I don’t know what else to try, I’m hoping some of you more knowledgeable people with experrince with these engines could help me out here.
Any help will be greatly appreaciated!
Thanks in advance!
I loved it! Ran great until the misfire!
I replaced the spark plug, coil (twice), and injector. I still have the code and it’s still misfiring which is causing the stumle at idle and anything below 2000rpms.
I don’t know what else to try, I’m hoping some of you more knowledgeable people with experrince with these engines could help me out here.
Any help will be greatly appreaciated!
Thanks in advance!
Senior Member
Joined: Jun 2010
Posts: 16,567
In my case you would have better luck with anybody else as far as knowledge and experience are concerned.
Sometimes a misfire that gets less with higher RPM can involve a vacuum leak.
Also , a questionable valve spring can do that too, but at all speeds.
A problem with an intake manifold gasket in the cyl #4 area could have a vacuum leak there.
EGR system can give misfires mainly at idle.
Don't know how much you want to do, but a compression test should help confirm if there may be a valve problem.
Sometimes, Fords will say misfire cyl# X and it could be cyl Y, so check adjacent cyls also. Let us know if any of this was of any help.
Sometimes a misfire that gets less with higher RPM can involve a vacuum leak.
Also , a questionable valve spring can do that too, but at all speeds.
A problem with an intake manifold gasket in the cyl #4 area could have a vacuum leak there.
EGR system can give misfires mainly at idle.
Don't know how much you want to do, but a compression test should help confirm if there may be a valve problem.
Sometimes, Fords will say misfire cyl# X and it could be cyl Y, so check adjacent cyls also. Let us know if any of this was of any help.
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