2002 Lincoln LS

2002 Lincoln LS V8 Two Wheel Drive Automatic 88000 miles

engine has intermittent miss when warmed up.A code stated #4 cyliinder misfire. Replaced all 8 spark plugs and # 4coil, and erased codes. Problem is still there. There are no codes in computer.
John dwyer
July 13, 2009.

Check the no.4 compression and injector

Engine Misfire can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

Jul 13, 2009.