Question about 1998 Ford F150 Regular Cab

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What could cause a missfire in a 1998 f-150 with a 4.6 ltr?

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Could be your injector(s), or the wires going to the injectors.
use an olm meter to check each injector. they should around 13 to 16 olms. if you get no reading then the injector is bad. if all injectors check out OK, check the wire connecters going to the injectors. if they all seem to be OK, then you may have clogged injector(s).

Posted on Aug 31, 2014

Spark Plugs
Bad Ignition Coils
Vacuum Leaks

Posted on Apr 06, 2011

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However the most common cause, especially on ford vehicles is a bad ignition coil. When trying to determine the cause of a missfire on an engine such as the one in your Navigator i start with removing the plug and checking for carbon tracing, excessive plug gap or contaminants on the plug. If that checks out ok i then swap the ignition coil from the missfiring cylinder to one that isn't. For example, I would swap the ignition coil from #1 to #2 and clear the codes. Then drive around until the light comes back. If it comes back with a missfire on cylinder #2 then you know the cause is the ignition coil and it has to be replaced. If it doesn't then it is something else causing the missfire which will require a bit more diagnostics.

How many miles are on your Navigator? Have the plugs ever been replaced? If you have close to 100k it would be a good idea to replace all of the plugs. Be careful when removing the plugs, it's not difficult to pull the threads right out of the head when removing the plug.

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I assume you have a ecu code telling you #3 coil is missfiring ?
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Hope this helps
Regards
George

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1 Answer

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