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Misfires in Cyl. 5 and 6, after changing problem continued

I have a 2002 Ford F150 4.6 I woke up turned on my car, and it was rumbling very bad and there was white smoke pouring from the exhaust. Guys at the shop ran a test and it said misfires in cyclinder 5 and 6 and unknown error code P0306. I changed the spark plugs and coil packets in cyclinder 5 and 6, but the problems are still there. Any advice?

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White smoke indicates the engine is burning antifreeze, you could have head gasket issue, if thats the case the antifreeze is getting in the cylinders and the engine is burning it. could be a stuck exhaust valve( i doubt it). find out from ford what that code indicates, that would be a better clue than tearing into the motor

Posted on Jul 21, 2009

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If you had code P0305, I don't know why they would have done anything to the #2 cylinder but if they have already replaced the plugs, wires and injector; here are a few more items to check:
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Number five plug not firing

I'm assuming this is a DIS(distibutorless ignition system).If it is,the most common cause is a defective coil pack.Each coil will fire a pair of cylinders together on 4 and 6 cylinder engines(one "waste" spark,one to ignite the mixture).Try swapping the wires at the coil pack to see if the misfire follows the coil tower,or the same cylinder misfires(keep in mind that a check engine light means you will have to clear the code to get the computer to feed that cylinder fuel before you start it up again).If the other cyl on the pack now misfires(i believe 1+5 are on the same pack on a Ford engine),then the coil is bad(spark is "leaking"to ground).If the same cyl still misfires,try swapping a wire+plug from another cylinder.

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I think you lost a digit in that code; misfires are generally in this format: P03XX with the XX designating which cylinder(s). If you have a V8, the code is likely to be: P0308 Misfires can be caused by 'fouled' plugs, bad ignition wiring, injectors that are occasionally sticking, etc.

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I doubt you have 2 bad COP Ignition Coils,
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Then the coil is bad. Even if the specs were ok, which they r not, the cracked case means its junk.

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No start

I'll give you a list of a few things that could be causing your problem. However, I think it's most likely a bad ignition module. I looked this up on the web and I see a lot of ignition module problems for the 2002 Escape. I checked the Ford recall list but there was no recall issued for what looks to be a very common problem with the ignition module.

Here are some other things that could be causing your problem.
1. Bad ignition coil
2. Clogged fuel filter
3. Clogged air filter
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5. Bad spark plugs, wires, distributor cap and /or rotor.

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