Hello I was wondering if someone could educate me as to the possible causes for the engine knock I am getting. I am not asking to be spoon fed the answer, just help in getting to the bottom of this without ruining the engine I just spent the last couple months rebuilding.
( Top engine refresh with slightly bigger cam and injectors as well as ported heads )
First of all I am throwing
[PCM] P0327 - Knock Sensor Circuit Low Voltage (Old) (History) (Current) (Immature)
But my understanding is that means its not sending any signal and should not be causing my PCM to register a false knock or even a legitimate knock.
The knock happens very briefly when I jump on and off the gas while its in neutral or when I was going up a fairly steep hill.
Also, the PCM is programmed to only retard the spark 6* max but yet when I was going up that hill my timing was 16* less than what it is at idle under no load. So somehow the PCM was retarding it another 10*? How could that be?
Also, I have about 26* spark advance at idle in park. Is that way too much. That's what the stock spark table called for at that RPM and MAP values but is that way off for a slightly bigger cam and injectors?
My limited understanding is the only causes of knock are spark timing is off, cylinder is overheating, bad gas or I am running lean.
Are there any other possible reasons.
Also being I very new to this. What can I do to ensure that the computer is not doing its best to "correct" my tuning issues and therefore not letting me see the true problem.
Any thoughts no matter how inconsequential they might seem, could be the key that gets me going in the right direction. So please don't be shy.
Thanks