Question about 1999 Ford Crown Victoria
Engine code PO 354 comes up stating that number 4 cyl. was miss firing so replace coil and spark plug also tested for power while running and did have. So the decided to replace all plugs and coils and still have the miss fire problem.then check on line and it stated that need to check the dis ignition module which we can not find. can you please tell us where its located. Called ford but couldn't tell me
A P0354 indicates a problem on the primary side of the ignition system. (Control side not the output side). If it is a 99 you should have a coil on plug system. (Single coil for each cylinder) if this is the case and you replaced the correct coil (cylinder 4 is the very rear cylinder on the passenger side) then the coil is not getting a signal to fire. There is no deticated module or DIS that you are looking for because the PCM is what sends a pulsed ground to fire the coil. In order to check if the coil is getting a signal you will need a noid light which you can get at any auto store and a set is pretty inexpensive. Basically just a LED type of tester. You said you have power to the coil so If when running the noid light is flashing the PCM is sending a signal which means it's working. If the noid light stays illuminated then you have either a short to ground on the signal wire or the driver in the PCM is stuck to full ground. It is doubtful a PCM driver would be stuck closed as it would burn out rather quickly. If the noid light does nothing then you have an open on the signal wire or the PCM driver is shot. I have seen drivers burn out If regular tune ups aren't done. Hope this helps, Mike.
Posted on Nov 25, 2014
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Posted on Jan 02, 2017
SOURCE: 2000 ford must. 3,8 L
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Since you already replaced the spark plug and wires. This can be caused by a dirty, clogged or inoperative fuel injector; air leaks; or low fuel pressure because of a weak pump, restricted filter or leaky pressure regulator. Worst is you are having loose compression in your engine. Please see this article for your reference.
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Posted on May 15, 2011
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