Tom Martin
Well Known Member
As a child conversing with my mentor neighbor about small gas engine problems told me that it was all very simple. "It takes three things to make and engine fire. Fuel, spark and compression.
Check fuel first, then spark then compression (mechanical items)
While it might be fuel, that is the easiest solution, the symptoms seem like valve to me. I have experienced partially blocked injectors but not a full blockage and so I do not have that to compare it with.
As far as the cylinder EGT peaking early and then falling off; Yes that could point to a partially blocked nozzle but we have no way of knowing if this cylinder normally peaks early, there is only one set of data here. Perhaps if we could go back a bit farther to a previous take off and look at that data we could see if things were similar.
If it were my plane, I would clean the injectors, flush the fuel system, fill with 100LL, change the spark plugs, and do the valve wobble check. These items are not expensive nor do they take a lot of time, why not?
Check fuel first, then spark then compression (mechanical items)
While it might be fuel, that is the easiest solution, the symptoms seem like valve to me. I have experienced partially blocked injectors but not a full blockage and so I do not have that to compare it with.
As far as the cylinder EGT peaking early and then falling off; Yes that could point to a partially blocked nozzle but we have no way of knowing if this cylinder normally peaks early, there is only one set of data here. Perhaps if we could go back a bit farther to a previous take off and look at that data we could see if things were similar.
If it were my plane, I would clean the injectors, flush the fuel system, fill with 100LL, change the spark plugs, and do the valve wobble check. These items are not expensive nor do they take a lot of time, why not?