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code p0303 refers to cyl 3 misfire detected ===causes engine mechanical fault--wiring--ignition/fuel system--injector--ECT/MAF sensor--ECM
code p0316 refers to misfire detected during start up --first 1000 revs===causes --engine mechanical fault--wiring--ignition/furl system--injector
the common fault cause is ignition/ fuel system and injectors so I would be checking fuel pressure and injector systems for clean and wiring connections are good especially on no 3 injector.
Code 303 is a miss or lack of power on cylinder 3. If you know for a fact that cylinder is getting spark it could be an injector problem.
Code 420 means the catalytic converter is not performing up to standard which could be several things including the miss on cyl 3.
that code is not a sensor code that is a missfire code , you have a miss fire in cylinder number 3 , check you spark plugs or coil for that cylinder , with that code car will run rough ( shaking ) and some time the car wont even start in small engine . let me know hosw it gos
p0303 is cylinder 3 misfire. Check that plug, boot and coil. . You can move this coil and boot to another cylinder to see if the code changes. If it does, you have a bad coil or boot. Its most likely the spark plug boot on cyl 3.
It's common for ignition coils to go on these vehicles. If you have a spark tester (auto parts store) install it on your #3 plug wire and check for a strong spark. By swapping the wire you obviously eliminated it as a possibility. There's always a chance that you have a compression problem or ad injector problem but chances are it's just a bad ignition coil. Mark the wires then remove them. You can remove the coil without accessing major components but it will be tight. Disconnect the connector and remove the bolts.
If not, look at the coil for hairline cracks. I see a lot of coils go bad and the vehicle will run worse when it's damp or raining out. Good luck!
To update my earlier repair on the 2001 6 cyl Escape: When cold, and when the ignition was turned over but no accelerator pressure given, the rough idle finally returned the P0303 code again when the check engine light came on indicating that it wasn't caused by the plugs or the coil. FYI, I had replaced the intake manifold gaskets during the original repair and just prior to that I had replaced the fuel filter which was very dirty (I cut it open to see).
The repair manual referred to fuel injectors as a possible problem. I have run three tanks of fuel using different injector cleaning products and am very pleased with the results. Cold starts are much smoother and I am unable to coax out the P0303 code or any other code.
My opinion, change the fuel filter, use a fuel injector cleaner for a couple of tanks, change the plugs if the problem still exists. The coils were not the problem on my vehicle.