The title may be a little misleading but I'm stuck on thinking my issue is the fuel system. My RV10 has been pretty much trouble free for 400 hours. 4 weeks ago I noticed on climb out it was rough (so was cruise), the number 1 EGT was higher than normal and erratic. moving up and down. Figured I had a nozzle that was partially clogged. Cleaned the injector and everything was back to normal for approx. 25 hours. Now my number 6 EGT is higher than normal by 75 - 100 degrees. I have the same engine roughness. Figured it was the same thing so cleaned the injector. This time it did not help. Called AP and asked them for suggestions. The next step was to test the flow divider, nothing was out of the ordinary, all 6 measuring cups were close to exactly the same. I though maybe that would have cleared out any dirt so took it up again but had the same roughness and higher EGT on number 6.
I'm looking for suggestions on what else I could try. Can't help but think I've overlooked something obvious as I'm fixated on the fuel system.
Here's what I've done so far and a little history.
1. All injectors were cleaned at annual (approx. 70 hours ago)
2. The roughness happens in cruise and higher power settings (20" - full power)
3. When I power back to 19" or less the engine runs very smooth like it always did.
4. I don't believe it's an ignition problem, roughness is the same on conventional mag and LS.
5. Cylinder temp on #6 is close to where it always was.
6. Run up is normal with no sign of roughness
7. The Flow Divider test has you run the fuel pump mixture rich, Throttle at idle after clearing the lines of air. That test showed equal flow but it's at idle flow not high power.
8. I switched the #6 injector nozzle with another and have the same issue on #6.
I was thinking the next logical step would be to remove the flow divider and clean per the service manual.
Any suggestions would be most welcome.
Gary
I'm looking for suggestions on what else I could try. Can't help but think I've overlooked something obvious as I'm fixated on the fuel system.
Here's what I've done so far and a little history.
1. All injectors were cleaned at annual (approx. 70 hours ago)
2. The roughness happens in cruise and higher power settings (20" - full power)
3. When I power back to 19" or less the engine runs very smooth like it always did.
4. I don't believe it's an ignition problem, roughness is the same on conventional mag and LS.
5. Cylinder temp on #6 is close to where it always was.
6. Run up is normal with no sign of roughness
7. The Flow Divider test has you run the fuel pump mixture rich, Throttle at idle after clearing the lines of air. That test showed equal flow but it's at idle flow not high power.
8. I switched the #6 injector nozzle with another and have the same issue on #6.
I was thinking the next logical step would be to remove the flow divider and clean per the service manual.
Any suggestions would be most welcome.
Gary