Fuel Knock

[Rawze]

some guesses...

> Leaky injector?.

>A weak signal on a cam/crank position sensor?.

>slipped cam?.

>metering or timing actuator that is wearing out?.

> Custom program and it has too much injection timing at idle?.

> A vacuum at the intake manifold at idle/low fueling?.

> damaged cam?

> Tone wheel on the crankshaft has play in it?

> excessive clearances in the crankshaft bearing(s)?.

> Loosing compression due to worn out head/valves?.

> Valve train and/or injector rockers out of adjustment?.

== Take your pick.