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Knock when revving in neutral!

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I'm thinking of Gas, a bad knock sensor, or phantom knocking (is your valve ticking)?
 
ok i got hks 272/272 and Prothane Motor Mount ..can the vibration to make my knock sensor to go on?
because i drove her up to 5500 rpm and there is no knock on first and second gear...i got 16g 9psi
my lifters are fine
 
ok i got hks 272/272 and Prothane Motor Mount ..can the vibration to make my knock sensor to go on?
because i drove her up to 5500 rpm and there is no knock on first and second gear...i got 16g 9psi
my lifters are fine


Thats so weird.. A lot of people have engine knock while free reving but there seems to be no answer for the problem... whats going on here?
 
I have some knock when I rev in neutral too but not in 1st to 3rd. My guess is there is no load being brought to the table? Just throwing that around
 
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