Question about 1996 Ford F150 Regular Cab

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Engine turns but does not start

The engine will turn but wont start.when you turn the switch on you do not hear fuel pump run just a click.took the battery cable off for bout 2 hours then it started and ran fine.the next morning it started ok and then when i got off work it started fine one time and i drove it maybe a couple hundred yards and cut it off and it would not start. i tried taking the battery cable off and letting it set for a while but it still would not start so i had to have it towed home.please help as this is my only way to ride and i don't have a way back and forth to work.it is firing and it is getting gas so don't know what to do next.

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  • alethiab Aug 21, 2008

    tried that today but did not help.any other suggestions? thanks

  • alethiab Aug 21, 2008

    I don't hear any popping only the motor turning over and by firing i do mean spark.

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One question you said that it gets gas and in firing you mean spark? Does it make any noise when turning over or just the turn over? No popping sound or something like that?
let my know soonest so can get you back on the road.

Cheers

Posted on Aug 21, 2008

  • Rob Cobb
    Rob Cobb Aug 22, 2008

    OK if you are getting gas and spark, now lets check for air make sure that your air filter is not plugged. If that is ok, what I would do next is to see if you have proper firing order, you can get the firing order off the internet. Have you checked for spark at all of the plugs or just the one? now you want to check for the timing of the spark with the firing order have some one crank the eng and you watch the spark to see if it matches. One other thing that you might want to check is if your vehicle has an over turn shut off. all it is is an box with and red reset button. check your owners manual for location. Please let me know what you fine out.



    Cheers

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Try a new spark plug or just clean the spark plug maybe there's too much carbon on it preventing the metal contacts to ignite properly. Also you can try to replace the battery connectors and terminals.

Posted on Aug 21, 2008

  • Michael Galve
    Michael Galve Aug 21, 2008

    Oh I see. Have you tested different battery as well?

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Why does the fuel pump relay don't click when i turn the key to run? and why there is no power at the fuel pump relay?


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hello. perhaps I can assist you.

Perform this test:

Fuel pump test:

1. Get yourself a helper.

2. remove the gas cap.

3. have one person listen in the gas tank at the gas cap opening.

4. have the other person turn the ignition switch to the ON position ONLY so as the dash lights come on. Do NOT attempt to start the engine.

5. As soon as the ignition key is turned to the ON position, The person at the gas tank should hear the fuel pump run for TWO SECONDS and then it should STOP.

6. Does it ?.


If you do NOT hear it run, in most cases the fault is the fuel pump relay or the fuel pump..


As soon as you turn ON the ignition switch to start the engine a 2 second ONLY battery voltage signal is sent from the computer to the fuel pump relay and from the relay back to the fuel pump in the fuel tank. This runs the fuel pump for ONLY 2 seconds of which pressurizes the fuel system in preparation to start the engine.

Once the engine starts, The computer BYPASSES the fuel pump relay and sends constant contionous battery voltage from the computer to the oil pressure switch of which is now CLOSED because the oil pressure is UP because the engine is running. Therefore the battery voltage flows thru the oil pressure switch back to the fuel pump to run the fuel pump constantly until you turn OFF the engine.

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It looks like there is starter problem. One wire coming to it is loose or there is a short iside. You turn the ignitions it starts to rotate, wire is coming out and car loosing power. So have the wiring and starter checked. Also might be deposition on battery clemmas.
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it may be the pump fuel relay, which is under the dash on the driver side by the fuse panel.

here is a way to determine that.

when you turn the key on the on position

do you hear the fuel pump running while the engine light is on, and does the pump stop running afteer the engine light goes off?

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also there are clicks that have to be heard on the starting process.

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2 when the check engine light goes off( a click has to be heard just after it goes off)

3 after the car starts

If you don't hear this clicks, try to get your ear close the location of the fuel pump relay( near the fuse panel under the dash).


the fuse relay is just a bunch of circuits soldered, so you can get it to someone who knows how to solder and fix it.

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