[Healeys] Odd misfire problem Cooper S

[SKIP SAUNDERS]

He probably doesn't believe in global warming either ... lol


-----Original Message-----
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Oudesluys
Sent: Thursday, October 16, 2014 3:05 PM
To: healeys at autox.team.net
Subject: Re: [Healeys] Odd misfire problem Cooper S

I would still try a new sparkplug AND lead for no. 2. I had a similar
problem with my JH years ago in the late seventies on my holidays in France
for about a fortnight. Dismantled the whole chibang several times, no luck
and finally came to the conclusion that is was the plug lead. I went to one
of those small road side garages and asked for a plug lead. He asked: for
what car? I told him it was for a Jensen Healey. He did not have any! I
tried to explain that any thing of a suitable length was OK but he still
maintained that it would not work. I then asked him if I could take a plug
lead of one of the scrap 2-CV's lying about in the yard. "OK, go ahead if
you must, but it will not work" . He was absolutely dumbfounded when the
engine started up as sweet as a nut. I was his knowledgeable hero of the
day.

Kees Oudesluijs


Michael Salter schreef op 16-10-2014 20:24:
> 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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