Why is my 1999 ford mustang gt 4.6l 5 speed misfiring only when it rains or

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locochriz1

New member
after it rains? My mustang misfires after or while it rains. I have had a code go off for cylinder 8 misfire and I've replaced the coil 3 times and the car stops misfiring for a while each time but then it rains and the misfiring starts again? The problem goes away like 2 to 3 days after its been dry? what can i do? is this an expensive fix? the problem seems to only occur within cylinder 8, all my spark plugs are new.... ford said i did not have to replace all the coils just because i was replacing 1. please do not answer this question if you do not know what COP is because that is the ignition config the car uses.
 
Your really having a rough time getting this one fixed. We have gone through this a few times before and it is still back to a moisture problem. Have you considered looking at your fender well skirting to see if the flaps are in place to prevent splash from getting to that cylinder? There is a rain seal at the fire wall where the hood meets the engine compartment, is it in good shape? Does this happen when you wash the car? Some how the moisture is getting there, you just have to figure out how and prevent it from happening. Good Luck One other though, have you evaluated the intake manifold for a possible leak in that corner? Just a thought.
 
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