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Electronicals / Forscan Expert
Joined: Fri Nov 24th, 2017
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I think it's a sticking exhaust valve. I capped off all the vacuum lines and tested for leaks, nothing. Injectors seem fine (haven't done a flow test yet) and fuel pressure is perfect. Talked to a guy about the dual spark ignition and he said the redundant makes it rare for an ignition based misfire. Have to have 2 faults for failure.
The only test that I haven't performed is a running compression test, even though static looked fine.
I totally forgot about the paper over the tail pipe method and so today when it was running rough I put a receipt back there with my hand keeping it flat and sure enough every couple of seconds it would try to suck the receipt into the exhaust. This leads me to believe it's a sticking valve.
I guess I'm going to be pulling the valve cover and check it out. Hopefully I don't have to pull the head.
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2000 XLT 2.5L A/T 2WD
Mods:
Power Windows/Locks Mirrors using OEM harness and parts
Explorer Sportrac White Face Cluster
Explorer OHC and Auto-dim Mirror
Auto Door Locks
Full HID Projector Retrofit