2002 4.6l v8 Cylinder 1 misfire - Ford Forum - Enthusiast Forums for Ford Owners

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Old 02-05-2010, 10:19 PM
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Question 2002 4.6l v8 Cylinder 1 misfire

My 2002 4.6L triton V8 has been giving me all sorts of issues on cylinder 1. It began when the plug was blown from the cylinder. I had the cylinder bored, tapped and an insert installed by my mechanic. The COP and plug were replaced. About 200 miles later, it started to run rough on the highway, and check engine light came on. P0301 came up... misfire on Cylinder 1. I pulled the plug and saw that the electrode was burned off. I replaced the plug and the fuel injector, and swapped the COP with another known good cylinder. I still have a constant misfire on Cylinder 1 that shakes the truck. I can hear the injector tapping when I place a screwdriver on the injector and place the handle to my ear.

Any thoughts?

I have access to an autotap if any engine performance parameters would be useful, just let me know, and I'll post the numbers.

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Old 02-06-2010, 12:36 PM
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Cylinder comp'd OK?
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Old 02-06-2010, 11:01 PM
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Yup, my first thought is check compression.
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Old 02-10-2010, 06:21 PM
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could the new injector be bad? does it actually spray fuel?

what about the new spark plug it could be bad too.
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Old 02-11-2010, 07:50 AM
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"I had the cylinder bored, tapped and an insert installed by my mechanic."

Was the head pulled to perform this?

If not, where did the metal filings go (scoured cylinder wall, thus loss of compression)?
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