Ford F150 Forumz banner

missfire problems

3619 Views 1 Reply 2 Participants Last post by  Takeda
Anyone know how to test spark plug coils, the garage told me four of them are bad.

I can replace them myself, I just need to know how to find which ones they are.
1 - 2 of 2 Posts
Are you getting any misfire codes? They should tell you which cylinders have a problem. You can also measure the primary and secondary resistance, and compare the measurements.
1 - 2 of 2 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top