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Re: [TR] Missing at high revs TR4A

To: triumphs@autox.team.net
Subject: Re: [TR] Missing at high revs TR4A
From: Chris Buckley <chris.buckley51@yahoo.co.uk>
Date: Mon, 6 Aug 2007 07:00:25 +0100 (BST)
Hi Listers,
  Still not much progress I am afraid.
  Have now checked the compression which is 100%. Now I am finding it seems to 
miss worse than before but improves greatly when I pull out the choke so seems 
it could be fuel after all. I disconnected the fuel line before the carbs and 
turned over the engine to find a strong flow from the fuel pump.
  What next?
  TIA
  Chris

Chris Buckley <chris.buckley51@yahoo.co.uk> wrote:
    Hi Listers,
  I have now changed the sooty plug and going for a test drive tomorrow. It was 
definitely sooty rather than oily. Regarding the PCV valve, I have installed a 
rocker feed kit as sold by Moss and was wondering if that could be the cause of 
a lot of oil being pushed through the valve and being dumped into cylinder no 3 
causing it to make the plug sooty.
  all advice greatly appreciated,
  Thanks,
  Chris
  > When I got home I removed HT leads in turn and found that removing the lead 
from number 3 cylinder made the least difference to the idle.
> I then checked all plugs and found No 3 to be 'sooty' while all the others 
>were clean burnt light grey colour.

. I would also check the soot 
on the plug--does it feel dry and fluffy, or oily? If the latter, it's 
time to do a compression check. If the former, the plug could be firing 
intermittently, or, there might be a slight vacuum leak at the manifold 
at that cylinder.

    
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