need coil help please!
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need coil help please!
I searched to no avail....I bought my wife a 99 expedition w/ 5.4, 91K miles, bought it on friday, check engine light on saturday. PO304 cylinder 4 misfire, naturally the hardest one to change. I have the new parts but for the life of me I cant even see the dang thing, what all do i have to pull to get to it? fuel rail? heater hoses? gosh it looks like a serious PITA, any suggestions?
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thanks for the reply, i tackled it last night, what a total pain, i have cuts all over my hands, its fixed, but there is no longer a bolt holding it down, that little sucker is mia, next time it goes to a mechanic. Now to try and fix a clank noise when turning at full lock (AWD)....hope its not bad 
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Joined: Sep 2000
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From: Needham US of A
Hey bigexp get a long magnet, buy'em at the parts store, long flexible magnet. Push it in right beside the alternator all the way to the back of the engine and fish it around, I'll bet you come out with the bolt thats where they always seem to go.
Changing the #4 coil isn't that bad, pull the PCV valve out of the valve cover and wire tie it and the heater hoses over to the brackets holding the plastic cover over the throttle body, then you can reach in alot easier.
You wanna talk about a pain just wait till you need to pull and replace that engine (just finished doing it on my 01 S-crew. Later Whit
Changing the #4 coil isn't that bad, pull the PCV valve out of the valve cover and wire tie it and the heater hoses over to the brackets holding the plastic cover over the throttle body, then you can reach in alot easier.
You wanna talk about a pain just wait till you need to pull and replace that engine (just finished doing it on my 01 S-crew. Later Whit
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Joined: Nov 2007
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From: West Texas
Since this truck is new to you I figure I should mention that the most common cause of a misfire code isn't a bad coil. It's water down in the hole. Just the least little bit of condensation and it will misfire. All you have to do is pull the coil and boot, blow it off, smear dielectric grease all over the boot inside and out and reinstall it. Dielectric grease should be put on whenever you pull a coil for any reason.
If it's rained recently, or you just bought it from a used car lot that got a little happy with the pressure washer then I'd bet that was all it was. I see too many people waste money on coils when it's not needed. You can buy new plug boots cheap from almost anywhere too.
If it's rained recently, or you just bought it from a used car lot that got a little happy with the pressure washer then I'd bet that was all it was. I see too many people waste money on coils when it's not needed. You can buy new plug boots cheap from almost anywhere too.
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Since this truck is new to you I figure I should mention that the most common cause of a misfire code isn't a bad coil. It's water down in the hole. Just the least little bit of condensation and it will misfire. All you have to do is pull the coil and boot, blow it off, smear dielectric grease all over the boot inside and out and reinstall it. Dielectric grease should be put on whenever you pull a coil for any reason.
If it's rained recently, or you just bought it from a used car lot that got a little happy with the pressure washer then I'd bet that was all it was. I see too many people waste money on coils when it's not needed. You can buy new plug boots cheap from almost anywhere too.
If it's rained recently, or you just bought it from a used car lot that got a little happy with the pressure washer then I'd bet that was all it was. I see too many people waste money on coils when it's not needed. You can buy new plug boots cheap from almost anywhere too.
thanks again guys
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