Question for Ford drivability techs

[bcschief]

Got a 86 Ranger with a 2.9 this has a knock sensor which is broken off and is an unobtainable part can I use any 2 wire knock sensor to replace this and wire it in with an appropriate connector ? Another words are all 2 wire knock sensors basically the same Thanks in advance

 

[bobbywalter]

No.

And yes.


Frequency is key.

 

[Dirtman]

Why does a 2.9 even need a knock sensor? Aren't they sub 9:1 compression engines?

 

[ericbphoto]

Why does a 2.9 even need a knock sensor? Aren't they sub 9:1 compression engines?

It’s to listen for death knocking at the door.

 

[bobbywalter]

They have agressive timing curves and lean when possible to maximize power and emissions for the time...and shit fuel is everywhere.....for the 80,s.

 

[adsm08]

Why does a 2.9 even need a knock sensor? Aren't they sub 9:1 compression engines?

Ford actually dropped the knock sensors on the 2.9 because they would pick up normal valve train noises and pull timing.

 

[Dirtman]

Ford actually dropped the knock sensors on the 2.9 because they would pick up normal valve train noises and pull timing.

I was actually just about to make a joke about 2.9s making so many noises the knock sensor probably gets very confused...

That being true just makes it that much more hilarious.

 

[8thTon]

Why does a 2.9 even need a knock sensor? Aren't they sub 9:1 compression engines?

How else would you know when to change the cam bearings?

 

[Dirtman]

How else would you know when to change the cam bearings?

Tuesdays?

 

[franklin2]

The 86 2.9 does have a knock sensor, it's on pin 23 of the computer. Maybe they did away with it later?

 

[Dirtman]

86 was the first year the 2.9 was put in a ranger...