Knock Sensor

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Apr 4, 2022 | 03:56 PM

llama

Thread Starter

5th Wheeling

Joined: Mar 2019

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Knock Sensor

I am replacing the heads and cam on my 94 5.0. Along the lines of since I am already in there, should I replace the knock sensor? It worked fine before I removed the engine. I just have no idea how long these things last.

Apr 4, 2022 | 04:50 PM

rla2005

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From: Kentucky

No reason to replace it. May not be able to find one anyway.

Apr 5, 2022 | 07:14 AM

llama

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5th Wheeling

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Thanks for your input.

Apr 5, 2022 | 12:09 PM

wwhite

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Why don't the 351w have the knock sensor, mine is a 1994 and it does not?

Apr 5, 2022 | 12:29 PM

llama

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5th Wheeling

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I don't know. I've never had a 5.8.

Apr 5, 2022 | 12:33 PM

rla2005

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From: Kentucky

As far as I know the 5.8L and 7.5L engines never had a knock sensor. Only the 5L and 4.9L engines have them.

Apr 5, 2022 | 05:01 PM

wwhite

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Quote:

Originally Posted by rla2005

As far as I know the 5.8L and 7.5L engines never had a knock sensor. Only the 5L and 4.9L engines have them.

Correct.
But why?
Will there be any added benefit adding knock to 5.8L?

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Apr 5, 2022 | 05:08 PM

wwhite

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Quote:

Originally Posted by SFaulken

I mean, no, not unless the ECM knows what to do with it.

My recent discovery of a 1995 6cylinder computer has the exact same hardware as my 1994 8cyl computer, but the 6cyl has the additional knock hardware present.
They are basically 2 bank batch fire systems, same hardware for controlling trans as well.

I plan on hooking up the knock sensor, but before I do, I would like to know why it wasn't there to begin with.

Apr 5, 2022 | 05:14 PM

#10

SFaulken

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Quote:

Originally Posted by wwhite

*That* I have no idea. You'd really have to ask a Ford Engineer. I can't imagine that the 5.8 and 7.5 are particularly less prone to knocking than the 4.9 or 5.0 under similar conditions.

Maybe they are, but especially for the 5.0 vs the 5.8 that really doesn't make much sense, the engines in a given OBS model year, once everything went EFI are negligible, aside from the obvious mechanical bits and the displacement difference.