#4 miss
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Joined: Jan 2005
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#4 miss
I have antifreeze leaking into the #4 spark plug hole. It's a 98 f150 4.6L 170k. I used an air compressor to blow out the hole but when it runs about 10 min it start missing again. I was wondering if anyone has any ideas? Intake or head gasket?
Elder User
Joined: Sep 2006
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I would look closely at the heater hose above #4 cylinder, it may be leaking onto the coil and seeping down into the plug hole.
I honestly don't think a head or intake would leak into the plug hole... it would leak into the combustion chamber.
I honestly don't think a head or intake would leak into the plug hole... it would leak into the combustion chamber.
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Joined: Apr 2006
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From: Funston, Ga
i agree. I have a 97 with 276,000 and at about 200,00, its did the same thing. It was infact the heater hose. Mine was leaking where the hose goes onto the intake tube. I just took the compression clamp off and put a regular hose clamp on it.....took care of problem.
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Thanks for the info I thought that may be the problem. It's hard to see back there and I watched for a while didn't see any leak. Sounds like a cheap fix I'll start by replacing the clamp. I just wanted to check and see if I was missing anything. Thanks!
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Elder User
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From: Duluth, MN
It's not the coil. The 98's didn't have coils yet. They still ran wires.... If it was a 5.4L it might have them. Pressure test the radiator system and watch it after u get about 15 psi of pressure for any leaks around that area....
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