Knock sensor??
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Lead Driver
Joined: Feb 2000
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From: Palm Bay, Florida
Knock sensor??
We have a 1994 F150 with the 5.0 with mass air-(one of the first as I understand that 1994 was the change-over year) anyway: down the road a little we will need to replace the engine-(has about 160k now and runs great!) we have a nice low mileage 5.0 from a 1987 Cougar that we'd like to install in the truck.....only problem is that the '87 5.0 does not have the provision for the knock sensor in the block--can we still use this engine? any way to drill & tap the block for the sensor? can it be bypassed? Thanks!
Elder User
Joined: Feb 2007
Posts: 690
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From: Madison Ohio
It will not trip the CE light however after a while it will get harder and harder to start. The computer will keep adjusting the timing looking for the knock. This is what I was told as the knock sensor went bad in my 88 F150 years back. It got harder to start every week. When I talked to the wench at my local dealer He told me that about the timing. I replaced mine and truck was back to normal in a couple days of driving.
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Lead Driver
Joined: Feb 2000
Posts: 5,374
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From: Palm Bay, Florida
So, It doesn't look like its the best thing to do if the computer will make the engine harder and harder to start-I wonder if it will evedentally not start at all? is there any way to electrically bypass the knock sensor?-just loop the wires at the plug may be?
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
I would not loop the wires. The knock sensor works very similarly to a normal audio microphone and generates a small voltage. I don't know exactly how the circuit is completed on the circuit board inside the computer, but I wouldn't take the risk of messing up something.
While you have the engine out of the car, why not go ahead and drill and tap the rear of the block for the knock sensor and install one in the replacement engine?
While you have the engine out of the car, why not go ahead and drill and tap the rear of the block for the knock sensor and install one in the replacement engine?
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