'97 Escort Misfire
I have a '97 escort with a 2.0 SPI, auto trans. 113,000 miles. Recently and frequently the service engine light comes on with a code for cylinder #4 misfire. Replace plugs and wires, ignition coil, along with fuel filter, air filter, purge flow valve and sensor, PCV valve and tube and some vacuum lines. No coolant in plug hole or visible leak anywhere. No smoke coming out exhaust and no smell either. Still every couple days the light comes on with #4 misfire. Fuel pressure checks good, compression checks good. I work at a Ford dealer and have had all the tests run and checks good. Myself and the mechanics are stumped. We're thinking possible valve sticking on #4. Intermintent rough idle and misfire re-occur. Today the car "surged" a little on acceleration (almost like the processor was debating kicking in or out of overdrive) and once again the light is on. I haven't had the code pulled yet but I'm assuming #4 misfire. Any insight or thoughts? The valve cover is leaking a little but not enough right now to be concerned. Any input is appreciated!