My Crown Vic recently developed a miss on the #4 cylinder.I have
changed the plugs,and wires.It still has the miss.I checked the coil
pack and the Fuel Injector and both are good.The check engine light is
steady from idle up to about 40mph.Above 40mph and the light
blinks.Any ideas what the cause might be?

Check your fuel pressure in the rail, also.

A compression test may be of some help to you, too. It may be that you
have a sticky valve or a leaky piston ring, or even worse, a blown
head gasket. Try having the vehicle scanned at an Autozone or local
shop for a code reading and tell us what the code is. I’m assuming
you’ll get a P0304 which is a Cylinder 4 Misfire. Ah, and the
blinking MIL lamp indicates that there is a misfire that is capable of
damaging your catalytic converter. Dumping raw fuel into the catalyst
is not so much a good thing :P

"bob_in_stpete" wrote:
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Ok so I did a compression test today and I am getting zero compression
on the number 4 cylinder.Will be removing the valve cover this week to
check what the cause is.Thanks for the help.


On Apr 6, 2:25 am, usarmyrangrs <n... (AT) 000 (DOT) com> wrote: