1997 Crown Vic with a miss.

External Since: Apr 04, 2007 Posts: 2

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?

Joined: Mar 29, 2007 Posts: 14

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 Razz