Smart Roadster 452 82ps Knocking only in 6th speed

[thanos12]

Hello my Smart Roadster started knocking ONLY at 6th speed specially with full throttle and more specific on rising road
I gone to smart and the system detects problem with knocking sensor. I change it with NEW(bosch).Also timing belt changed.
The scanning tool continues to showing the same error.
I run a dyno test and checked the map and everything showing perfect.
I run a diagnostic test for the cylinders on road and I verified that the knocking problem is on 3rd cylinder and only in 6th speed.
I changed the fuel filter and I am running only 100 octane fuel. I used also a FI cleaner oil (mixed with fuel).
The problem insists. Any ideas??? Thanks.

[tolsen]

Timing belt changed?

You mean timing chain?

As reqards knocking on cyl 3, try move fuel injector to another cylinder and see if knocking moves.

[Mr T]

As Tolsen has suggested, it could be a fuel starvation issue, engine running lean at heavy load.
When was the last time the fuel filter was changed?