knock Question - Toyota Nation Forum : Toyota Car and Truck Forums

carcatz · 03-16-2005, 07:31 PM

Its getting warmer so the car comes out and I am having the same problem as last fall every once and a while I get detonation dose anyone have any info I have new plugs, cap, rotor, wires, I was wondering if anyone has this problem its mostly stock with K+N cold air and ko racing exaust, could there be a lose connection in relation to this issue, I was thinking that the IC fan is not comming on at certian times??? I don't know

JekylandHyde · 03-16-2005, 08:21 PM

How do you know you are experiencing knock?
What octane fuel do you run?

The IC fan should only come on if your engine bay temps are over 160 degrees (IIRC).

carcatz · 03-16-2005, 10:04 PM

well it is a rattle sounds like pinging!
92 octane
it only happens when it is under boost sometimes.

JekylandHyde · 03-17-2005, 07:44 AM

Are you able to make full boost?

carcatz · 03-17-2005, 11:03 AM

yeah, to stop it I have to let off the gas!

JekylandHyde · 03-17-2005, 11:17 AM

Why would you want to stop it?
What are you controlling boost with?

If you were expereincing knock, your bosot would be limited.

carcatz · 03-17-2005, 12:59 PM

The noise (pinging) dosen't sound right.
The car only has the factory boost settings/controller.
Lets say I am experiencing knock I thought that the knock sensor would react fast enough to only hear a couple knocks, and if I am hearing the knock for a duration without the computer taking over would it be the knock sensor?
Do you get a dash light if the knock sensor goes bad?

JekylandHyde · 03-17-2005, 02:00 PM

I am fairly certain you are not hearing knock. The 3SGTE's responds to amazingly small amounts of knock (that you can't hear) and start pulling timing, adding fuel and limiting boost.

Why did you say 2 posts above that you have to take your foot of to stop boost?

And yes, if you blow your knock sensor you will light the dash light for check engine.

carcatz · 03-17-2005, 02:23 PM

take foot off gas to stop noise!
I wish I knew what I was hearing, it sounds like detonation.
is there anything that would cause this kind of noise?
could the dealer screwed it up changing the timming belt?

JekylandHyde · 03-17-2005, 02:25 PM

Maybe it's your valves tapping?

carcatz · 03-17-2005, 02:32 PM

would this happen all the time or occasionally?
at what mileage should they need adjustment, I have 89,000miles.