Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Wed, 07 Apr 2004 22:00:59 -0400 Message-ID: X-Original-Return-Path: Received: from rwcrmhc12.comcast.net ([216.148.227.85] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3151600 for lml@lancaironline.net; Wed, 07 Apr 2004 19:12:25 -0400 Received: from MJR (h000094c615c2.ne.client2.attbi.com[65.96.140.242]) by comcast.net (rwcrmhc12) with SMTP id <2004040723115301400seri9e>; Wed, 7 Apr 2004 23:11:53 +0000 X-Original-Message-ID: <001401c41cf6$a6c0c400$f28c6041@ne2.client2.attbi.com> From: "Mark Ravinski" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] New Problem need ideas. X-Original-Date: Wed, 7 Apr 2004 18:51:12 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 I've been struggling with a rough running engine problem for a long time now. It only has this miss / stumble, when flat out racing, - full throttle, ram air door open and anything over 2640 RPM. (the problem seems more RPM sensitive than throttle and can occur from 19 gal / hr low to 13 gal / hr at 10,000 ft.) Varying mixture, switching off the mag or electronic ignition and cycling the boost pump have no effect. I got serious about this several months ago and started digging. Valves were a little loose so cylinders came off. Three had small cracks so now I have new cylinders. No change to the roughness. I also put in new sparkplugs and wires, different hydraulic lifters and fuel injector nozzles. I got a new Dukes fuel boost pump and moved it from forward of the firewall to under the header. No change to the roughness. Today, I swapped out the electronic ignition controll to a different unit. No change to the roughness. Is it time to overhaul the fuel injector servo? Any other ideas? Mark Ravinski N360KB 1382 and frustrated.