Re: Backfire in overrun mode (load change)
Valve guides, ... I don't want to think that far.
However, the problem should be identified by means of a compression test / pressure loss test.
I tried to open GAV further. Even with a full turn, there was no change. So I don't think he's running too lean. But there the spark plug picture should provide information.
Alternatively, I made a lambda sensor adapter that can be installed between the manifold and the rear silencer. It is possible that you will also gain new knowledge in this way.
The thing with the leaky manifold gaskets I find absurd, because I also made sure that the installation was reasonable. Nevertheless, I will check it all again. I will use brake cleaner for this.
Greetings Andy
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