Misfires on three cylinders after replacing ignition coils on spark plugs

Asked by Abel Feb 07, 2021 at 09:35 AM about the 2003 Jaguar S-TYPE 4.2L V8 RWD

Question type: Maintenance & Repair

I started out with misfires on cylinders
one three five and seven. I replaced
ignition coils and put brand new spark
plugs and I still have misfires on
cylinders three five and seven. What
can be causing this issue to still

1 Answer


Either the cylinder is not holding compression, sometimes due to head gasket issues or a valve. Also the fuel injectors on those cylinders might not be working correctly due to wiring or just clogged with dirt. Hard to say with doing some testing. Start with a cylinder pressure test.

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