OH what joy. NEW PROBLEMS.
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Coils
Sounds like you were getting to the bottom of it delldude, but i didnt read all the posts.
Coils Coils Coils!!!
I had a similar problem on my 5.4l If you get any water an top of that engine and it makes it to the spark plug seat in the block, it will almost certainly short a coil. There is a very common problem on #4. There is a cooling line with a hose clamp fitting that sits right over the top of the #4 coil and the stock clamp is famous for leaking. That coil goes out first usually. Be sure to swap that clamp out if it hasn't been done so already. I'd double clamp it. Its a $2 maintenance procedure and OEM coils are around $50 - $60 so small price id say.
Coils Coils Coils!!!
I had a similar problem on my 5.4l If you get any water an top of that engine and it makes it to the spark plug seat in the block, it will almost certainly short a coil. There is a very common problem on #4. There is a cooling line with a hose clamp fitting that sits right over the top of the #4 coil and the stock clamp is famous for leaking. That coil goes out first usually. Be sure to swap that clamp out if it hasn't been done so already. I'd double clamp it. Its a $2 maintenance procedure and OEM coils are around $50 - $60 so small price id say.
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Joined: Feb 2011
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ya thats pretty much that. There's a little internal solenoid that triggers voltage to each spark plug (hence their outrageous cost of replacement) so if one shorts the switch is trash and you may get intermittent firing, but it will never work like it is built to. It will often burn out like a fuse would so you can usually hook up a multimeter and do a resistance test to see if there's an open line.
The much easier approach is to just pull the coil (keping it connected to the electrical fitting), start the engine, and hold it close to the intake manifold or block. If you don't get a spark, trash it.
The much easier approach is to just pull the coil (keping it connected to the electrical fitting), start the engine, and hold it close to the intake manifold or block. If you don't get a spark, trash it.
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