X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 01 Jun 2005 11:47:03 -0400 Message-ID: X-Original-Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 980459 for lml@lancaironline.net; Wed, 01 Jun 2005 10:23:58 -0400 Received-SPF: none receiver=logan.com; client-ip=24.25.9.102; envelope-from=matt.hapgood@alumni.duke.edu Received: from HP780N (cpe-066-057-255-054.nc.res.rr.com [66.57.255.54]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j51ENBY5012423 for ; Wed, 1 Jun 2005 10:23:12 -0400 (EDT) From: "Matt Hapgood" X-Original-To: "Lancair Mailing List" Subject: misfire X-Original-Date: Wed, 1 Jun 2005 10:23:13 -0400 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_006E_01C56693.EAB8EA60" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Importance: Normal In-Reply-To: X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_006E_01C56693.EAB8EA60 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I had a problem on a flight on Saturday that I have never had before. = The plane is just out of annual. I made a one hour flight at 25" x 2400 = RPM. Approach asked me to descend relatively quickly. I pulled the = power back to about 21" x 2500 RPM and the engine started running rough. = I noticed the #4 EGT at zero. I pushed the MP back up and it cleared = up. I pulled the RPM down to about 2300 - 2400 and it cleared up. Just = leaning the mixture didn't solve the problem, nor did richening the = mixture. This was the first annual where I have NOT replaced the plugs. Instead, = an A&P just cleaned them (they are automotive Iridium plugs). I have electronic ignition and electronic injection. Was it a clogged = injector? Not likely, as it cleared up at higher MPs and lower RPMs. = Was it a spark problem? Not impossible, but it would have had to kill = both plugs. Were the plugs fouled? Not impossible, as #4 is my richest = cylinder. But the problem happened later when I tested it, after I had = been running for 20 minutes LOP. Unfortunately, I tried to get it to happen again on the ground and, of = course, it won't repeat itself (at about 20" and 2400 RPM). Any thoughts? I'm going out to decowl the plane and inspect the plugs, = but I'd appreciate any thoughts as to what to look for. Matt ------=_NextPart_000_006E_01C56693.EAB8EA60 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =EF=BB=BF

I had a = problem on a=20 flight on Saturday that I have never had before. The plane is just = out of=20 annual. I made a one hour flight at 25" x 2400 RPM. Approach = asked=20 me to descend relatively quickly. I pulled the power back to = about=20 21" x 2500 RPM and the engine started running rough. I noticed the = #4 EGT=20 at zero. I pushed the MP back up and it cleared up. I pulled = the RPM=20 down to about 2300 - 2400 and it cleared up. Just leaning the = mixture=20 didn't solve the problem, nor did richening the = mixture.

This was the first annual = where I have=20 NOT replaced the plugs. Instead, an A&P just cleaned them = (they=20 are automotive Iridium plugs).

I have electronic ignition = and=20 electronic injection. Was it a clogged injector? Not likely, = as it=20 cleared up at higher MPs and lower RPMs. Was it a spark = problem? Not=20 impossible, but it would have had to kill both plugs. Were the = plugs=20 fouled? Not impossible, as #4 is my richest cylinder. But = the=20 problem happened later when I tested it, after I had been running for 20 = minutes=20 LOP.

Unfortunately, I tried to = get it to=20 happen again on the ground and, of course, it won't repeat itself (at = about 20"=20 and 2400 RPM).

Any thoughts? I'm = going out to=20 decowl the plane and inspect the plugs, but I'd appreciate any thoughts = as to=20 what to look for.

Matt

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