Question about 1985 Ford F150

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Will not fire - have sprayed Starter Fluid into the intake and still no fire. Have replaced coil and ECU. Have not checked any relays, inertia switch or other electrical. I checked spark at plug earlier and it was weak. Have not checked again after new coil. Will do so today. Great old truck - 75,000 miles - lots of use left.

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  • jack_knight May 07, 2010

    I didn't give you enough info. It is 302 FI AT 2WD. It has the Ford TFI-IV ignition. Ignition module is on the side of the distributor. I am getting spark to plugs (although it doesn't look strong).

    As I said, having this spark, I sprayed starter fluid in the intake and do not get any attempt af firing.

    The main fuel pump comes on and runs until satisfied??

    I checked the fuel pressure regulator and it does not seem to be ruptured.

    The ignition module referred to above was replaced about 10,000 miles ago.

    One question: if the main pump is not delivering enough pressure, would the fuel pressure regulator not allow fuel to flow?

    The engine would start and run until it warmed up. Five minutes later...would not start.

    After a couple of weeks, it got to the not starting/firing as it is now.

    I realize this is Ford earlier attempt at FI and it is awkward and crude compared to new stuff and

    it is nearly impossible to apply OBD1...can't find it.

    I appreciate your efforts.

    Thanks, Jack

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Ford's Duraspark Ignition systems are problematic.
I would suggest CLICKING HERE and registering for a free account.

Then CLICK HERE to take you directly to the troubleshooting section for the DuraSpark.

It is rather lengthy to type all out here.... but chances are good the Distributor/Ignition module needs to be replaced.

Thanks!!

Posted on May 06, 2010

  • blueextc3221
    blueextc3221 May 07, 2010

    The fuel pressure regulator has a MINIMAL cracking pressure (1-3psi). If your pump is not delivering that - its time for a new fuel pump.



    However you stated that spraying fluid didnt help a bit - and that would put it back at ignition related.



    The ignition module you replaced only 10,000 miles ago does not make it failsafe :)



    BTW -

    The OBD Diagnostic Link Connector is located:
    Under hood, driver side, front side of shock tower, mounted on wheelwell


    Have you actually tested the fuel pressure?
    What about the voltage coming out of the regulator (Under hood, passenger side, front side of shock tower, mounted on fenderwell) ?
    ... or the battery voltage for that matter?

    Thanks!!

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