knock sensor replacement

[904runner80917]

So i went to pep boys today and they pulled a code said the knock sensor with open or faulty,wanted to do a flow test to make sure it was bad.I have been reading alot of post about the knock sensor and the wiringmsome say it is most likelt the wiring that is bad on them before it is the sensor and i read where some guys want to put high octane in the vehicle so it wouldnt set off the code or something? So i was wondering would it throw that code if someone got ahold of some bad gas or low octane gas? i just got the vehicle and when i got it the check engine light wasnt on , and i have never put gas in it yet.I have only driven it a few miles,with all the talk about high octane fuel i was just wondering if trying a high octane fuel might help or am i just dreaming? ok so if iam then i read the location of the sensor is under the upper intake, and it is a real pain to do.Anyone got any advice on doing this job before i do it, and how do i make sure the sensor is bad? Thanks for any help i get.

 

[glideraz]

i didn't think it was that bad to replace time consuming yes i have a fsm and it walks you right through everything you need to do. i don't know about testing i heard you can only do with an oscilloscope i went to toyota and got the replacement pigtail and that fixed my code cost about 10.00 bucks good luck with it. and also i tried the high octane method and it did not work for me.

 

[4runner_kid]

Before you take it apart make sure you have a deep 27MM socket to remove the sensor from the block.

 

[904runner80917]

where do i find this fsm i need it?

i didn't think it was that bad to replace time consuming yes i have a fsm and it walks you right through everything you need to do. i don't know about testing i heard you can only do with an oscilloscope i went to toyota and got the replacement pigtail and that fixed my code cost about 10.00 bucks good luck with it. and also i tried the high octane method and it did not work for me.

 

[willyt4r]

link to help

http://www.ncttora.com/fsm/1990-1995_4Rnr/Toyota.4Runner.1990.1995/files/repair.html

 

[904runner80917]

Wow so what section do i find the info on replacing the knock sensor?

 

[glideraz]

i got my fsm with the purchase of my 90 runner but i know there is alot of instructions listed on this site as well as others on the internet (you could probably print out the fsm)