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Discussion Starter · #1 ·
So last week when i was driving home from work my car started missing and throwing a code for the number 3 cop. after looking closer i found the the back of the intake manifold was leaking coolant into the plug boot causing the misfire. so i ordered a replacement ford racing pi intake and installed it today with new gaskets and thermostat. The car fired right up but was smoking a lot at first(i assume it was from some coolant probably getting into the intake runner). after it warmed up the smoke went away but im getting a small hesitation under a load around 4000 rpm mainly in 2 and 3 gear. i have double checked all of the connections and checked for air leaks. im running out of ideas, it ran fine before i swapped out the intake. Anybody have any other suggestions ?
 

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Discussion Starter · #3 ·
I cleaned the coolant from the cops, I have not replaced the plugs,the ones in it are less than a thousand miles old. I didn't think that coolant on the outside of the plug would have ruined it? But I will get more tomorrow just in case.
 

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a.k.a. Racecougar
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The plug wells, COPs, and boots need to be absolutely dry. Inspect the boots for any cracks, tears, or traces of arcing. If it continues, it will likely be a failing COP, as they don't tolerate firing while wet with coolant too well.
 

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COP's. I would remove all of them and use a dryer or heat gun to dry out the wells. Or an air compressor with a water separator if you got one.
 
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