David Schmidt
Member
2003 sport trac 4L.
ok - I've been chasing a "missing" or "burp" in my engine for a while now. Misses every time a/c cycles , put in / out of gear, press on gas first time, etc. Just a little burp. Previous post said to go back to stock so I took my demon coil and put stock back in - no difference. So I took out all six Denso Iridium spark plugs and wires and replaced with Motorcraft platinum and some 8mm oe fit wires. Car still has miss of course but does run smoother. My new problem is the plugs. All three plugs on drivers side - the tips were basically melted off. All three plugs on passenger side looked like the day I installed them. This thing ran pretty darn good and got good mpg. The gaps on left side were like off the chart .70+. I think the scremin demon coil may have helped with the big gap. I took a picture of the plugs as they were removed in order. You can clearly see a difference. I'm assuming I'm not talking about a valve issue or piston issue or even a fuel injector issue. Whats different on this side of engine? I recently replaced the Oxygen sensors (upstream ones) - not sure when the plug damage occured though. No check engine lights, etc. Thoughts?
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ok - I've been chasing a "missing" or "burp" in my engine for a while now. Misses every time a/c cycles , put in / out of gear, press on gas first time, etc. Just a little burp. Previous post said to go back to stock so I took my demon coil and put stock back in - no difference. So I took out all six Denso Iridium spark plugs and wires and replaced with Motorcraft platinum and some 8mm oe fit wires. Car still has miss of course but does run smoother. My new problem is the plugs. All three plugs on drivers side - the tips were basically melted off. All three plugs on passenger side looked like the day I installed them. This thing ran pretty darn good and got good mpg. The gaps on left side were like off the chart .70+. I think the scremin demon coil may have helped with the big gap. I took a picture of the plugs as they were removed in order. You can clearly see a difference. I'm assuming I'm not talking about a valve issue or piston issue or even a fuel injector issue. Whats different on this side of engine? I recently replaced the Oxygen sensors (upstream ones) - not sure when the plug damage occured though. No check engine lights, etc. Thoughts?
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