At 21:04 17/09/95 -0400, you wrote:
>75 MGB running again?
>
>I can't explain the tach behavior but the problem seems to behave as a fuel
>problem. I have seen similar symptoms with trash near the tank fuel pickup.
> Although I would be reluctant to try the propane torch method you should be
>able to isolate the fuel system before the carburators to see if it makes a
>difference. You could try connecting to a friend's MG using a long piece of
>fuel hose. Good Luck!
>
>2-79 MGs
>
>MGPhil @AOL
>
This is probably not what's causing your problem but the swinging tach'
reminds me of a problem on a friend's 'Spit' (ugh...) that we diagnosed
after much head scratching. The symptons were that the engine started OK &
would tick over at 800-1000 no problem. If it was started on choke it would
rev up to about 1500 then cut then rev then cut etc. until eventually it
would settle down & tick over normally.
After much fiddling with the fuel system we spotted a fragment of wire that
had come detached from the points connection in the distributor. Under
1000rpm the wire didn't touch anything. Starting on choke increases the
idle speed & as the revs increased the mechanical advance turned the
baseplate until the wire touched the metal distributor housing & shorted out
the points. As the revs dropped the wire disconnected again & the engine
restarted - ad infinitum.
Kevin
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