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1. 04:28 PM - intermittent idle problem (Dennis Holbrook)
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| Subject: | intermittent idle problem |
Greetings experts...
Recently purchased an RV6 (1994-98 build) with a (H)IO-360 engine -- '95
vintage Airflow Performance (Bendix) injection system/Performance
Propeller cruise prop (wood w/ damper) and dual Electroair ignition.
Performs beautifully... almost all the time. I have an intermittent
idle issue. It's not a typical rough idle, but when the problem shows
itself it's as if the ignition is turned off, then immediately back on,
i.e., smooth idle for several seconds, abrupt pause, smooth
idle...abrupt pause...etc. Seems to occur more often with a hot engine,
though it's cropped up a few times on initial start-up. The problem has
been consistent with the engine from day one... almost 300 tach hours.
Troubleshooting so far:
- replaced one electronic ignition system with a mag... no change.
-wrapped exhaust system and installed heat shield between exhaust
and fuel control... n/c.
-checked all O-rings/connections for possible air leak...n/c
-installed 0.22 injector nozzles to increase pressure downstream of
flow divider... n/c.
Other things that seem to have no effect:
-electric boost pump on/off
-direct air intake or alternate
-leaning
One thing that sometimes clears the problem: 1800-2000 rpm for 30-45
seconds.
Don, at Airflow Performance, is convinced I'm vaporizing gas downstream
of the flow divider, but so far no fix. He has recently set me a
'stiffer' spring for the flow divider. I've installed same and flown
the aircraft a couple of times with no problems, but I've often flown
2-3 times in a row with no problems, so the jury is still out as to this
being "the" fix.
Anybody have a suggestion/theory/similar experience?
Dennis
Virginia Beach
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