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I've got a truck with a fuel knock, just like the cold knock they get but only at low fueling. Coasting while just touching the accelerator and at high idle for example. It seems to be much more noticeable in the front bank so I put a spare timing actuator on the front and nothing changed. I'm going to try a spare metering actuator tomorrow but I'm just chasing some ideas and input in the meantime.

Cheers.

what kind of enigne?

have you done a leak test?

CM871 E, I'll see what I come up with.