At 03:59 PM 03/07/03 +0100, you wrote:
>I have a Mk 3 from '68 which is a tired old nail but provides plenty of
>entertainment through the summer & recreation through the winter. It's
>had a problem for some time which is getting a little worse & beginning
>to be a pain, so I was wondering whether anyone out there could help.
>
>After 20 miles or so, once the engine is good & warm, it starts to
>misfire. This will happen at 20 or 70 and happens mainly when
>accelerating: power is feeble, the engine note becomes wetly flatulent
>and there are noisy backfires, sometimes out of both ends. After maybe a
>minute of accelerating on full throttle, say up a long hill, and
>complaining all the time it sometimes clears its throat & goes OK while
>the throttle stays wide open. This started a few years ago on very warm
>days (75f is very warm to me) after 40+ miles but now it's becoming too
>frequent to ignore.
>
>Things that have been changed without stopping it:
>
>Coil, Leads. Plugs, points condenser (several times). Distributor & cap.
>Fuel pump. Fuel lines (& tank cleaned), the line from pump was
>insulated. Carb needles & jets, floats & valves (set for height,
>synchronised, check the pistons are free moving, have oil etc etc.). The
>block and head have changed twice, as well, in that time.
>
>Any ideas?
>
>My feeling is that the problem is with the carbs, as it's a misfire and
>they are the only thing which hasn't changed. But, I'd like some
>confidence before splashing out on new ones at half the value of the
>car. Not that I'm tight or anything, you understand.
>
Is there a heat shield undeer the carb? My old spit had the problem it
came to me with headers and no heat shield. I put one in. all was ok. The
78 we got now. has one in and no boiling the fuel problems.
cheers
Marv
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