Question about 1990 Ford F150

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I have a 1990 ford f150 it will not run when you take your hand off the key, If you keep the key in the starting possien it will run but dies as soon as you let off the key.

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  • snapdrago786 Mar 23, 2011

    I replaced the ignition switch and it ran fine for one day and did the same thing, So I replaced the whole column and it still does the same thing, Any help or advise please and thank you....

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I've had this once. The run contact on the ignition switch is shot, but the ignition contact in the start position is still good. Replace the ignition switch.

Posted on Mar 12, 2011

  • Paul Bade Mar 23, 2011

    I thought about the possibility of the engine having such poor performance that it could not run without help from the starter, but the fact that it worked for an hour with a new ignition switch implies that is not the case.

    Check the run contact on the ignition switch (any of them, particularly the new one you installed on the old steering column) with an ohmmeter (vehicle battery disconnected!) when you have the key in the run position. If it is open, then you probably have another fault that is burning up the switch contact. Usually such a problem will fry the fusible link in the ignition circuit before the switch is damaged, but perhaps somebody defeated that protection by replacing the fusible link with an over-sized piece of wire.

    The fault could be a wire in the ignition circuit with bad insulation shorting to ground or one of the components connected to the ignition circuit. It is unlikely to be one of the latter since that would usually cause a noticeable problem with engine performance (unless it is a "kill the engine" intermittent short).

    Did the Check Engine light come on before the engine quit? What codes are stored in the computer? These may be a clue.

  • snapdrago786 Mar 23, 2011

    I have'nt checked the codes. And te check engine light nerer came

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