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I have a 1997 f-150 with a 4.6 liter v-8 i am not getting any fire i have replaced the crankshaft sensor we also tried hooking a snap on scanner on it and it is not letting it read anything it just sits and cranks over and over please someone help me.

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  • Nappier Fabrication
    Nappier Fabrication Nov 11, 2014

    Hi steven meadows, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? Or call me?

  • steven meadows
    steven meadows Nov 11, 2014

    i just talked to my mechanic we checked all of the fuses under the dash and the hood and they are all good, we plugged the scanner in and the truck will not even let it start to find the problem. i replaced the crank shaft sensor this morning and still nothing, the motor is cranking we took off a wire on the coil and therre was no fire, the truck has been sitting for 2 months only being started 3 times and the last timei moved it about fifty feet and it would not start after that

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Check your coil

Posted on Nov 11, 2014

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This sounds like the primary ignition coil is fried, get one from a scrap yard for a few bucks & replace it, It may also be a good idea to replace the plugs, HT leads, Distributor cap & rotor arm as all of these can cause a lack of spark, If you are getting the spark but no bang then you have an issue with the fuel system = either the fuel filter is clogged or you have a faulty pump - often even if you can hear the pump prime before attempting to crank over the engine there may not be enough juice in it to get the fuel from the tank to the engine, again get a replacement pump from a breakers but buy a new filter. Good Luck.

Posted on Nov 11, 2014

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You didn't say what sensors you changed. Your check engine light should be on. If you were to get hold of a scanner it would tell you what the problem was. I will guess that you need a crankshaft sensor.

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For your age truck, the system had an earlier diagnostic setup. The scanners that read it are not very expensive and such a scanner may reveal the problems.

In your case, some of the issues may be a reaction to the failure to start because there are automatic shut-offs when one part of the system fails. The crankshaft sensor for example controls the volume of fuel by regulating pressure for a given RPM and it okays spark for the engine. So nothing is wrong with the fuel system or the coil, but each is controlled by the crankshaft sensor.

This is why a spray of starting fluid may make the engine run on ether and bypass the automatic shutdown of the fuel system. The engine RPM's may reboot the ignition system.

You can sometimes borrow testing tools from the major autoparts stores. I was also going to say that a stuck thermostat sensor can make an engine too lean to start, but you indicated no fire at coil and you would have ignition power no matter what the temperature sensor indicated.

Check out youtube videos about the crankshaft sensor. Get a scanner for your age of truck, it may save you money.

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