I've been noticing an occasional miss / stumble ever since I did my last condition inspection. It might happen once every flight, and last for under a second. I'm not sure if I'm imagining something, or if I messed up a spark plug gap or ignition wire - or something else entirely that I am erroneously attributing to the inspection. Any thoughts on where to start an investigation?
Van's Air Force
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Occasional engine stumble / miss O-360
- Thread starter maus92
- Start date
My thought was also fuel. Maybe something in the filter. If doing as often as once a flight maybe the pump. If possible, look at pressure when it happens as johnbright suggests.
Bob Martin
Well Known Member
Fuel air spark
I agree with fuel air spark.
10 years ago we had just gotten a -6 with 0-360 FP.
Flying home from the purchase we noticed a slight miss...previous owner said he never noticed it. :-(
Try as I might I could not create it, or predict it. But it persisted non the less.
The air is easy to check. All clear? no intake leaks, compression test, etc.
The spark is easy too, mag check/inspect, wires tested, Plugs cleaned, tested.
The fuel was harder to test, at least once fuel flow was checked as we did not have equipment to test the carb. So we replaced it with a new one.
Problem solved!!
Ps to story, I sold the carb as a core with the history, new owner had it Overhauled and the problem was still there....so it was really something with the carb. Just a story to help you figure it out.
Fuel air spark. Good Luck.
I agree with fuel air spark.
10 years ago we had just gotten a -6 with 0-360 FP.
Flying home from the purchase we noticed a slight miss...previous owner said he never noticed it. :-(
Try as I might I could not create it, or predict it. But it persisted non the less.
The air is easy to check. All clear? no intake leaks, compression test, etc.
The spark is easy too, mag check/inspect, wires tested, Plugs cleaned, tested.
The fuel was harder to test, at least once fuel flow was checked as we did not have equipment to test the carb. So we replaced it with a new one.
Problem solved!!
Ps to story, I sold the carb as a core with the history, new owner had it Overhauled and the problem was still there....so it was really something with the carb. Just a story to help you figure it out.
Fuel air spark. Good Luck.
BCP Boys
Well Known Member
Something else to consider
Although unlikely, you may take a minute to read Post #28 Here about my experience. I chased it down for 2 years and spent thousands of dollars fixing things that were thought to be culprit... turned out to be a much less expensive and unlikely source.
Although unlikely, you may take a minute to read Post #28 Here about my experience. I chased it down for 2 years and spent thousands of dollars fixing things that were thought to be culprit... turned out to be a much less expensive and unlikely source.
