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Mysterious Knock Please Chime In.

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Old 11-23-06, 10:50 PM
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Mysterious Knock Please Chime In.

I have consistent Knock On Throttle. The PFC Heat Light starts blinking. I've narrowed it down to the following :

1. Consistently starts knocking at 2500RPM upto 3500RPM's.
2. Knock according to the datalogit is low 30's to high 70's.
3. I've reduced warning thresh to 20 and gone around with a mallet tapping various parts including drivetrain but the problem still persists.
4. I;ve replaced or rechecked everything from injectors, coils, ignitor but everything seems to be within spec.

A couple of questions:

What are dangerous knock levels?
Could a faulty oil pump cause knock?

My relevant Mods
PFC, GT35/40,OBX FPR, Hi-Flow Fuel Pump,Straight 3 inch exhaust Piping with apexi cat back.

I appreciate any input on this.

Regards,

Dave
Old 11-23-06, 11:20 PM
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Knock in the high 70s wouldn't normally be that troublesome. Have you checked the condition of all the sensors using the Commander?
Old 11-24-06, 02:06 AM
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From what I remember the answer was to my knock question :

30 is no more dangerous than 70, as long as it's constant, what you want to look out for is sudden increases in a nominal level.... (Spikes)
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