---------------------------------------------------------- LycomingEngines-List Digest Archive --- Total Messages Posted Fri 06/15/07: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:28 PM - intermittent idle problem (Dennis Holbrook) ________________________________ Message 1 _____________________________________ Time: 04:28:23 PM PST US From: "Dennis Holbrook" Subject: LycomingEngines-List: 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message lycomingengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/LycomingEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/lycomingengines-list Browse Digests http://www.matronics.com/digest/lycomingengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.