hey guys i got an 01 focus with the 2.0 zetech this past august. recently it threw a check engine light for a #4 cylinder miss. it does not do it all the time but when it does my speedometer will jump up an undetermined number. does anyone have any ideas on this. has an AEM intake and recent tune up if it matters.
02-06-2013 11:37 AM
New coil pack, plain and simple. Me an a million others have had this problem
02-06-2013 11:53 AM
is this something i should expect in the future? or is it just a problem with OEM units
02-06-2013 01:02 PM
Seems to be an issue with the Ford units. I've replaced them in other models too. Ford isn't known for their ignition coil strength.
02-06-2013 07:39 PM
replace it with motorcraft. do not use any other brand or you will regret it.