2000 F150 5.4 Random Multiple Misfires
01-26-2013, 06:37 PM
#1
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2000 F150 5.4 Random Multiple Misfires
Hello,
New here, please forgive if Im doing this wrong.......
2000 F150 5.4 with 186,000 miles, keeps throwing P0300 code. Truck has a consistent misfire or stutter around 1300 rpm when giving it gas lightly in park or neutral. The tach will drop and then go back up.
Replaced so far: All 8 plugs (Motorcraft), All 8 COPs (Accel, yellow ones), Fuel Filter, Serpentine Belt, IAC Valve, EGR Valve. Throttle Body gasket (removed and completely cleaned throttle body) and PCV valve.
Also had B&G fuel system cleaner performed (rip off??) And fuel pressure checked.
Checked for vacuum leaks in all the recommended places. (I think)
Have had it in to 4 different shops, 1 being the dealership........so far NO ONE can figure it out!
ANY help at all would be greatly appreciated!!!
New here, please forgive if Im doing this wrong.......
2000 F150 5.4 with 186,000 miles, keeps throwing P0300 code. Truck has a consistent misfire or stutter around 1300 rpm when giving it gas lightly in park or neutral. The tach will drop and then go back up.
Replaced so far: All 8 plugs (Motorcraft), All 8 COPs (Accel, yellow ones), Fuel Filter, Serpentine Belt, IAC Valve, EGR Valve. Throttle Body gasket (removed and completely cleaned throttle body) and PCV valve.
Also had B&G fuel system cleaner performed (rip off??) And fuel pressure checked.
Checked for vacuum leaks in all the recommended places. (I think)
Have had it in to 4 different shops, 1 being the dealership........so far NO ONE can figure it out!
ANY help at all would be greatly appreciated!!!
Last edited by plingpling; 01-26-2013 at 10:48 PM. Reason: more info
02-01-2013, 12:38 AM
#4
Junior Member
you've done just about everything i can think of. i would probably try a mass air flow sensor or possible intake gasket. is the intake on your truck plastic or metal because i have heard of issues with the plastic intakes on the 5.4's cracking and causing leaks
