why does cylinder 7 keep misfiring even after I replaced the coil, sparkplug, and wires on my 02 Jag S-Type 4.0L?

Asked by Sep 16, 2014 at 04:13 PM about the 2002 Jaguar S-TYPE 4.0

Question type: Maintenance & Repair

after my mechanic replaced the ignition coil and sparkplug on cylinder 7 and fixed any wiring as well, #7 cylinder will misfire and engine light comes on after a driving for a little while. This has happened 5 times

4 Answers

Do a compression test. See if #7 is lower than the others

4 people found this helpful.

That,s the only way,to know,,

1 people found this helpful.

i was told that you must replace all coil packs when you replace one or the one you replace will keep going out! Have anyone else heard this?

2 people found this helpful.

Have the fuel injector wires looked at. I had this happen to me before, but it was cylinders 1 and 3. I looked at the the wiring, even all the wire that was factory wrapped and found wires to be broken in half.

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