I am a firm believer that a good carburetor tune up begins with the electrics.
But before going nuts with this, check to see if there is a clogged fuel filter
or some other inlet obstruction. I had these same symptoms on my MGB. After a
thorough ignition analysis and tune up, and a carburetor adjustment and
synchronization (at idle and no load, of course) I failed to fix the problem.
It got progressively worse until it began to affect low speed running as well.
I changed the fuel filter (I didn't realize that color was bad!) and emptied a
tablespoon or more of crud out of the fuel pump. A new filter and blowing out
the fuel lines did the final fix.
This may not be your problem, but I wished I had checked this stuff first.
Jerry Goodman wrote:
> I humbly come to the experts...
> 948 operating on points not electronic
> Under load ...like 2nd 3rd and 4th..accelerating at about 3000-3200 rpm
> loses power and exhaust sounds like sputtering. If I pull the choke it makes
> no difference..so it makes me think electonics...plugs look fine...but have
> not been tuned in oh maybe 5K.
> I have ordered all distributor tune-up stuff. Points plugs cap wires
> condenser....U think I'm on the right track????
> Thank you
> Jerry Goodman
> 59 BE
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