You should install even a basic EDM700. They are quite cheap. Most of the installation time is running the thermocouple cables and drilling the exhaust system. If you already have a multicylinder monitor then the sensors are already in place.
Then you do the simple GAMI test flight, and it should be obvious what is happening.
If you cannot download, do a flight, dropping the common fuel flow from rich to lean by 0.2 USG/gr per minute, and get a passenger to write the values down every 1 minute.
Before that, wash out the injectors in MEK overnight.
@Przemek posts moved to your previous identical thread.
Here its video how its looks like. When I want to move back to rich there isnclearly visible point where fuel flow is going down and engine strat’s be rought.
When I’m leaning (look knob turning direction) also there is moment where engine nearly quits, then its good again…
Injectors was cleaned yesterday again, they are new anyway as it was one of the steps of troubleshooting.
Seems like servo but this is last tink I want to do due to price, anynother idea is worth to try.
Which instrument is one looking at?
Peter wrote:
Which instrument is one looking at?
Middle one in the rightmost row. It shows fuel pressure to the left and fuel flow to the right.
Very strange.
The values seem to be random, even though I can’t really work out what the mixture control is doing.
I would check the mixture control cable and the servo linkages for stiction. Make sure they move totally smoothly.
Then I would have the fuel servo overhauled. I use Don Rivera to do my servo. I have a spare one, RSA5AD1, on the shelf. He can issue an 8130-3 but can’t do an EASA-1 so whether you can use that will depend on interpretation of this.
It might even be something in the air path which came off somewhere; a piece of debris.
I would not fly a plane with any weird engine behaviour. Taxi, but never fly it.
