Knock sensor

[IMINYOURCHAIR]

okay. since I bought the expy back in November of 13, since then it has had a rattle from the engine that I had chalked up to be the missing exhaust studs. then I discovered the code for the knock sensor. well, today I put 93 octane fuel into it. filled it up from near empty too. the rattling noise is gone so I am thinking it's the knock sensor not letting it run proper on 87 octane. what do y'all think?

 

[juan214]

is it actual knock or ping? As he truck is designed to rum on 87 and have a ping no matter what.

Note: the fuel change will not a difference n economy (my opinion)

 

[IMINYOURCHAIR]

From 87 to 93 I didn't see any change in economy. Just that the engine runs much quieter under load than it has ever ran. I do have an engine code for the knock sensor as well

 

[juan214]

If you can live with it is up to you. Knock sensor is a simple device, but must doing something to the engine. Whats you MPG? If you getting less than 10 i wouldconsider changing it. To change it is big PITA job, you'll need a set of intake gaskets. You'll need to remove the entire intake system, belt, alternator, upper radiator hose, EGR, disconnect fuel rail, and harness.

 

[IMINYOURCHAIR]

mp is 16 to 19 depending on how I drive and where I drive. knock sensor lives under the intake that I have already had off when I bought the truck so I am aware of that beast lol. I will replace that when I get the head gaskets replaced over the course of the next months. right now my time is going into this Taurus i bought to temporarily take the place of the expy unless I find something terribly wrong with the expy