Question about 1988 Ford F 150

2 Answers

Cyl 8 filling with gas and hydrolocking engine

Thought the injector was stuck open replaced with new injector and still has the same symptoms

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  • b18me May 16, 2009

    where is the ecm im not entirely familiar with fords ...

  • b18me May 16, 2009

    is it the gray connector with like a 8mm bolt holding it on ...on the drivers firewall

  • b18me May 16, 2009

    well for testing purposes i think that its worth ohming out the signal wire to see if there is high resistance ...i also saw something that the signal from the distributor could be an issue ..so im going to check both of these things ...valves have nothing to do with a cylinder filling with gas ...compression test with matching numbers across the board ...koeo fuel pump relay plugged in cyl 8 plug removed let sit for 30 secs crank engine fuel shoots out of the spark plug hole .....
    koeo fuel pump relay disconnected cyl 8 plug out let sit for 30 secs crank engine no fuel spray out of spark plug hole


  • b18me May 16, 2009

    without the engine running there is nothing the valves have to do with the issue ....koeo the whole time ...not koer ...its a fuel injected 302 so its getting a trigger signal telling cyl 8 injector to open and thats what its doing ..its staying open

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  • Master
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Hi, this is bad valve timing or a bad valve spring located on the number 8 cylinder. the valves are out of time or they are sticking. this scan also be a early signal of a bad cam spot as well.

The only way this cylinder can over fill is if the valve is sticking or the spring is busted. i would inspect the valve clearance and timing on this cylinder. inspect the rocker arm and spring for faults as well.

Posted on May 15, 2009

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  • Michael Masters
    Michael Masters May 16, 2009

    Hi again, the ECM is located in the Seating area, passenger side, under dash, mounted





    behind kick panel










  • Michael Masters
    Michael Masters May 16, 2009

    The computer is rarely the cause of problems in the fuel system. When
    it is, the parts are not repaired. The entire unit is replaced.

  • Michael Masters
    Michael Masters May 16, 2009

    I stand by my solution.....

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  • Ford Master
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Check to see if the injector signal wire is shorted to ground, to check this disconnect the ECM, pull the connector off the injector, the red lead is 12 volts, the other wire is the signal wire, probe the connector with one end of a Ohm meter and touch the other to ground, there should be no more than 3 ohms showing.

Posted on May 15, 2009

  • yadayada
    yadayada May 16, 2009

    driver side down low, connector is inside engine compartment.

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Posted on Jan 02, 2017

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