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Crankshaft Sensor

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Old 08-08-2018, 06:20 PM
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Crankshaft Sensor

Hey everyone I have a problem my 85 f250 351w will crank but won’t fire I have been told if the crankshaft sensor is out that it won’t? I guess my question is if this is true and a possible location?
 
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Old 08-08-2018, 07:23 PM
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I don't know everything but I don't think it has a crank sensor.
I take it you don't have spark and why it was thought crank sensor.
I hope the person that told you that does not fix cars for a living.

Dose your dist. have vacuum line to it or just wires going into a small box?
Maybe post up a picture of your dist. so we can see what you got.

As a guess if you have that small box with wires going into it known as a TFI module could be bad.
Or if you have a vacuum line to the dist. the IGN. module on the inner fender is bad.
Dave ----
 
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Old 08-08-2018, 07:39 PM
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It doesn’t appear to have a vacuum line to it? Thank you very much
 
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Old 08-08-2018, 08:00 PM
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You are right that box off the side with the wires going to it is the TFI (thin film ign) They are cheap enough I would replace it and if that is not it you have a spare in the glove box.
The only other thing I can think it could be is the pick up coil, think its called PIP forget what it stands for, inside the dist.
Dave ----
 
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Old 08-08-2018, 08:51 PM
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Dave,

These OBD-1 systems use the PIP signal as a crank position sensor and yes, its failure gives you a no-start.

But it will alert you ahead of time by throwing a code for it BUT you need to pull the codes, we don't have a CEL/MIL.

So, OP... pull your codes to figure out what the computer has to say about things, it's the first step in diagnosing any computer-controlled engine.
 
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Old 08-09-2018, 03:54 AM
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Originally Posted by ctubutis
Dave,

These OBD-1 systems use the PIP signal as a crank position sensor and yes, its failure gives you a no-start.

But it will alert you ahead of time by throwing a code for it BUT you need to pull the codes, we don't have a CEL/MIL.

So, OP... pull your codes to figure out what the computer has to say about things, it's the first step in diagnosing any computer-controlled engine.
So this PIP am I right it is inside the dist. or is it some where else?
I don't want to send him down the wrong rabbit hole LOL
Dave ----
 
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Old 08-09-2018, 05:28 AM
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Originally Posted by FuzzFace2
So this PIP am I right it is inside the dist. or is it some where else?
I don't want to send him down the wrong rabbit hole LOL
Dave ----
The PIP is in the Dist.
 
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