Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 25; Flight Crew Total 3000; Flight Crew Type 1000
Aircraft Equipment Problem Less Severe
Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft
VFR flight via GPS direct. After uneventful cruise at 5500 ft MSL; engine running rich-of-peak by 50 degrees and with no change in controls the engine momentarily seemed to 'quit'; not roughness or vibration but rather a momentary loss of power that lasted maybe 1 to 4 seconds. I increased mixture; switched tanks and turned on aux fuel pump. Engine ran for another 30 to 50 seconds then quit again for a few seconds. Process repeated approximately 5 or 6 times enroute to [destination airport]. ATC advised of the condition and I requested maintaining altitude and would continue to destination. Landing uneventful.Had mechanics go over the engine and fuel system the following morning. NO anomalies found to explain the event. NO evidence of water or other fuel contamination. JPI data evidently was corrupted and not usable (instrument to be sent to factory for repair). Eventually flew the return trip using a route over lower terrain in case of engine failure but flight was uneventful.
The reporter has not identified a cause for the momentary loss of engine power. Aircraft is fuel injected; has fuel bladders; flush fuel caps; and is hangared. No water has ever been found in the fuel system.
Cessna 206 pilot reported several occurrences of momentary engine power loss for unknown reasons.