Question about Ford Focus
P0303 - Missfire Cyl. 3 .-----------
Try reducing the gap a bit on the spark plug #3 and see if it helps. If it does, then you probably have an ignition problem (plug, wire, coil, wiring, etc...).If you have replaced plug wires and coils then check compression on that cylinder? If it's low then that indicates a mechanical problem (rings, valves, etc...). How about the fuel injectors? You might try swapping #3 with a different cylinder and see if the problem follows the injector. You should also closely examine the wires going into the coil plug. The stock wiring harness pulls these wires too tight, and can cause them to fail.Check the coil-pack plug /connector.
If all checked ok then it is faulty fuel injectors and needs to be replaced.
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Posted on Jul 29, 2010
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Posted on Jan 02, 2017
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