p0304 2000 5.4 110,000 miles. not a coil
2000 F150 Triton 5.4
engine is ok at idle. Has a single cylinder misfire when under heavy load or 50% + throttle.
Not setting a p0304 yet, but went into mode 6 with the scantool. Found 8000+ misfires on cylinder #4. Swapped plugs, coils, boot and injector with cylinder #3. Misfire continues on cylinder #4. Also checked and found good back pressure at the exhaust. Verified good spark and checked fuel circuit with a noid light. Compression is 145-160 on all cylinders.
oh yeah. Also checked for vacuum leaks. None found.
Last edited by V8Triton; 01-27-2010 at 11:40 PM.