Sounds too lean to me. The idle runs high until the excess air
catches up, too lean to run, dies until the slow air flow in the
manifolds allow enough petrol to deposit on the runners, then
evaporate to enrich the mixture, then it's back to running high until
the air catches up again.
Try enriching the mixture a flat or two. (Assusming SU carbs. If
it's a ZS, I can't help.)
HTH,
Donald.
> From: KEschhofen@aol.com
> Date: Mon, 8 Oct 2001 19:43:40 EDT
>
> I am trying to the spit on the road before the snow.
>
> My Mk3 spitfire is idling strangely. It will idle about 2k RPM for a while
> then run down and almost stall then run back up to 2k RPM. Most of the time
> it stays high. This cycle continues to repeat. I did put a new fuel pump on
> from TRF prior to this behavior, but if the pump where faulty I would think
> it would have problems idling so high. The Idle runing up and down has got me
> stumped.
>
> Ideas?
>
> Thanks In advance
> Kevin Eschhofen
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