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Old December 7th, 2006, 07:43 AM   #1
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Default knock sensor? to use or not on 300-6 in f-150

While switching everything over from the blown block to the good block (300-6) I realized that the spot on the new block (late 70 carbed) is diff than the old block (95 EFI) where the knock sensor needs to go.

A mechanic told me just leave it off and unplugged for now. It shouldn't be a problem.

Can anyone confirm this for me?
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Old December 8th, 2006, 12:02 PM   #2
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Well that sounds like a shitty idea.
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Old December 8th, 2006, 01:10 PM   #3
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I would defn find another port on the block and put it in somewhere. There are plenty of unused holes in the block, but they will need to be tapped to the correct size
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Old December 8th, 2006, 09:00 PM   #4
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Quote:
Originally Posted by ckupq View Post
Well that sounds like a shitty idea.

His reasoning for leaving it off unless it poses a problem is that alot of trucks with plows or ladder racks have to have them unplugged because the rattles resonating through the truck fromthe plow or rack will trigger the knock sensor and retard the motor.
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Old December 8th, 2006, 09:01 PM   #5
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Low power is better than a hole in a piston.
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Old December 9th, 2006, 11:14 PM   #6
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Low power is better than a hole in a piston.
x2.
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Old December 11th, 2006, 03:24 PM   #7
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If the sensor is unplugged, it may default into a mode with less timing to protect the engine ("octane adjust", usually 3 degrees of retard applied to the base table).

I'm saying it should be okay left off and unplugged. As fars as drilling and tapping somewhere else in the block - I would advise against it. Knock sensors are placed in the area they can get the clearest "signal" to pick up knock. Once the location is chosen in development, the knock system is tuned to ignore normal enginesounds at that location. Those will change if it is mounted elsewhere and may trigger retarded spark by falsely detecting knock.
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