wut does it do ? please explain....

 

i believe it detects knock
if it does knock it retards the timing

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by komat &raquo;</TD></TR><TR><TD CLASS="quote">i believe it detects knock
if it does knock it retards the timing</TD></TR></TABLE>

 

stil confused what knocks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by A-busive &raquo;</TD></TR><TR><TD CLASS="quote">stil confused what knocks</TD></TR></TABLE>

Pretty much to sum things up: Us eg guy's don't have one so when we "ping" we have to either adjust the timing or get a higher octane fuel to make it go away. From what I understand, the knock sensor detects the ping and retards the timing to the point where it no long "pings" or knocks. Someone please correct me if I am wrong, but I think I have it right.

 

and if theres anything wrong with the knock sensor or connected the wrong way does it give problems when 1st turn on ur car when is cold, perhaps in the morning like rpm's fluctuating or anything of that sort?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cuban0 &raquo;</TD></TR><TR><TD CLASS="quote">and if theres anything wrong with the knock sensor or connected the wrong way does it give problems when 1st turn on ur car when is cold, perhaps in the morning like rpm's fluctuating or anything of that sort? </TD></TR></TABLE>

Sounds like your having a problem with your FITV. Clean it out and the morning surging should go away.

 

and where can i find the FITV?

 

A knock sensor, as stated before detects "knock." When an engine knocks (sometimes called "pings"), it is detonating.

The flame front isn't propogating the correct way inside the combustion chamber. This can be caused by any number of factors. Running too lean, incorrect timing, etc. If this happens, there are a number of explosions that happen before the flame front hits it (creating intense hot spots in the chamber/head/block). The pressures from this are intense and can cause lots of damage. Cylinder walls can crack, rods and bend/break, valves can snap, etc.

On a stock motor, a knock sensor detects these knocks/pings and retards the timing a little until there is no more knock. It is just a safety system. For example, if you run 87 octane gas in your GSR, it will retard timing (and reduce performance a little) so that you don't knock.

If you do something crazy, such has have a badly tuned turbo setup, the knock sensor can only do so much.

 

thanx....and where can i find the FITV?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cuban0 &raquo;</TD></TR><TR><TD CLASS="quote">thanx....and where can i find the FITV? </TD></TR></TABLE>

If your car even has one, it'll be located right under the throttle body.

 

and if theres anything wrong with the knock sensor or connected the wrong way does it give problems when 1st turn on ur car when is cold, perhaps in the morning like rpm's fluctuating or anything of that sort?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cuban0 &raquo;</TD></TR><TR><TD CLASS="quote">and if theres anything wrong with the knock sensor or connected the wrong way does it give problems when 1st turn on ur car when is cold, perhaps in the morning like rpm's fluctuating or anything of that sort?</TD></TR></TABLE> I don't think the knock sensor works untill the car is at normal operating temp. It really sounds like your FITV (Fast Idle Thermo Valve) is acting up. The FITV is only on when coolent is cold (warm-up) and raises the idle. It is quite common for the FITV to act up and cause surging idle when warming up.