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Re: [Healeys] Odd misfire problem Cooper S

To: Richard Ewald <richard.ewald@gmail.com>
Subject: Re: [Healeys] Odd misfire problem Cooper S
From: Austin Healey <pajtamuvek@gmail.com>
Date: Fri, 17 Oct 2014 06:24:45 +0200
Cc: Healey List <healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <CAB3i7LJHN5c2Dbu_qP3e82xLPMn1HuPJqRzjtLK67A_YKevpMw@mail.gmail.com> <1947D53641C24C339FDA896C528FFAB7@DavidNockHP> <CACOF-TrW+Eh-kDfnow2ih8TcxuD4vpx73PmHZxKv2k7C+Hu4Eg@mail.gmail.com>
Valve gap? If too tigth, it might not let the valve seat.

Gergo

2014-10-17 2:06 GMT+02:00 Richard Ewald <richard.ewald@gmail.com>:

> I'm with David, There is something different about the conditions in that
> cylinder.  Since it only affects #2, I think you can rule out carbs, rotor,
> points, dwell, condenser and anything that effects all the cylinders.
> Intake vacuum leak, cap, spark plug lead, valve or cam lobe issue is what
> is left.
> I have seen cracked caps missfire on one cylinder but you said you tried a
> new cap.
> Since you say it goes away sometimes, this could also be a valve issue,
> either binding in the valve guide, or  broken valve spring.  Broken valve
> springs are sometimes not obvious, when you look at them.
> Let me know what you find
> Rick
>
> On Thu, Oct 16, 2014 at 11:40 AM, David Nock BCS <healeydoc@sbcglobal.net>
> wrote:
>
> > Intake manifold intemittent leak due to heat
> >
> >
> >
> > David Nock
> > British Car Specialists
> > 209-948-8767
> > www.britishcarspecialists.com
> > -----Original Message----- From: Michael Salter
> > Sent: Thursday, October 16, 2014 11:24 AM
> > To: healeys@autox.team.net
> > Subject: [Healeys] Odd misfire problem Cooper S
> >
> >
> > I figure that if we can discuss the merits of various brands of GPS I can
> > ask this question.
> > I have been around British cars for about 50 years and worked on them
> > professionally for 30 so I have a pretty good understanding of how to fix
> > them..i.e. no obvious suggestions!!
> > My daily driver (summer) is a 1967 Morris Mini Cooper S.
> > It has recently developed a misfire on one cylinder..the problem
> sometimes
> > goes away after driving for a couple of miles but not always.
> > The engine runs both at idle and higher RPM on 3 cylinders...
> > When I check the plugs #2 plug is wet and obviously not firing.
> > Swap #4 & #2 plugs and the same cylinder, #2 still misfires and wets its
> > plug.
> > Compression test shows all cylinders even at about 160 p.s.i.
> > Install a spark tester (gap) between the plug cap and the plug of #2
> > cylinder and the engine runs, still on 3 cylinders, with a very healthy
> > 3/4" spark showing in the tester. This to my mind eliminates almost any
> > ignition problem as the likely cause.
> > Both valves for #2 cylinder open and close a lot (649 cam).
> > Checked the points cam and it opens correctly for all cylinders.
> > Fitted a replacement distributor cap and rotor...no change.
> > I'm starting to run out of ideas here..
> > Disassembled both carbs, and checked the fuel supply and float float
> level
> > on each.
> > Now I'm really running out of ideas!!!! Help......
> > Michael S
> > BN1 #174
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