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MY FORD KA HAS A MISFIRE AND THE FAULT CODES ARE PO271 AND PO304. I HAVE REPLACED THE LEADS AND PLUGS BUT HASNT REALLY HELPED. AFTER THE CAR HAS BEEN RUNNING FOR A COUPLE OF MINUTES IT IS OK.

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  • Ford Master
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P0304 is a misfire code for cylinder # 4 , code P0271 is a code for

P0271 - Cylinder 4 Injector Circuit High Description: See the description for DTC P0261. Possible Causes: See the possible causes for DTC P0262. Diagnostic Aids: Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test HL .
You have a wiring problem , or open fuel injector or the transistor that controls it inside the engine computer is shorted . There are videos on youtube show how to test this type problem . How to test fuel injector circuit with basic tools open control wire

Posted on Dec 30, 2016

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code p 0304 refers to no 4 cylinder misfire ===causes --injector , injector wiring, --- valve --- plug,-- HT wiring --coil
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Hello there.
Sounds like number 4 cylinder problems ;spark plug, leads. coil;

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From this page
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