I have a 99 ford explorer with a 4.0L OHV engine that needs the #3 spark plug changed every 2 months or The following symptom occurs every 2 months.
The following symptom occurs every couple months then goes way completely after the spark plug is changed. On start up the engine will have a noticeable miss then after about a minute it will clear up and run fine. When driving 40-50mph light acceleration or cruse the engine will start bucking( missing) seems to clear if down shifted or accelerated. I tried ignition parts coil, wires.
The compression is fine. Ford changed ignition parts and intake manifold gaskets 8yrs ago and70K miles. Like stated before a new plug always makes it run good for while. No fouling or abnormalities on plug. Any ideas? Thanks, J
Sunday, April 14th, 2019 AT 9:19 AM