Hi,

After 2-3 min. of easy regular driving the S300 will display .1V from the knock sensor constant and woun't go away until the engine is turn off, it will not go to 0V even if I leave it on idle after it comes up.

If I turn the car on and leave it at idle it will stay at 0V, it will not change to .1V until it is driven. I have lower the timing, change the plugs to NGK number 9's and I'm running a mix of 100oct and 110oct fuel. I also replaced the knock sensor and no change.

What could be the reason? Could it be a false reading?

Any help would be greatly apreciated!!

Engine setup:
GSR block with Golde Eagle sleeves bored to 85.5mm
85.5mm high compression Wiseco pistons (13.5:1)
Carillo rods
Gsr crank
B16 head shaved (don't know how much)
Crower stage 2 cams
330cc mazda injectors at 50psi/60psi WOT
Complete assembly was balanced

 

My vote...

 

If I had to guess the knock sensor will always read a voltage when being vibrated, I think its the severity of the vibration that causes the knock trigger threshold, and this is determined by the ecu.. or in your case probably some obsecure checkbox or value in your tuning software.

Again, this is all a guess on my part.

--Aaron

 

a knock sensor is a microphone, the ECU determines which sounds are knock and which are normal engine noise.
in your case, .1V is likely a voltage offset or induced noise introduced to the system by driving the car.
bad grounds, faulty wiring, and bad knock sensor could cause this.

 

Seeing as your setup isn't anywhere close to stock, regardless of what's actually going on, I'm not understanding why you're expecting feedback close to stock anyway. Funny. Disable the knock sensor.