Hoo boy.B I've been reading archives until my eyes crossed trying to find a
consistent answer about how to stop an engine from running on.B
I've actually run this car for three full seasons without dieseling.B At
inspection I asked my (extremely good) mechanic who's owned many of these to
adjust the carbs.B Apparently I had been running rich by about two full
flats.B My mpg has improved from nearly 22 mpg to a bit over 25 mpg.B But
now the engine diesels.B
One suggestion was carbon deposits.B This could be, though I run at 3800
RPM's for 30 minutes every day.
Another suggestion was plugs fouling, usually related to carbon deposits, I
guess.B Mine are tan.
Another suggestion was to use higher octane fuel.B I will if I have to, but
I'd prefer a mechanical solution first.B Besides, ISTR that consensus on the
List was that these cars were meant to run on regular?
Yet another suggestion had to do with timing.B I haven't checked that for a
while. When I did, I set it to factory specs by measuring the diameter of the
pulley, did the math of degrees-to-inches,B then put a dot of white-out where
the advance timing should be.B ISTR it was 4 degrees.
And yet another suggestion was that the butterflies weren't closing
completely.B This one has me wondering because of two things:B a) the engine
flutters momentarily when accelerating out of idle, and b) the engine doesn't
hit idle immediately, albeit it's much better since installing a third spring
to the linkage.B On the other hand, I've tested the cylinders and they lift
and drop smoothly with a distinct clunk.
Whoops.B Looks like my keyboard is dieseling on.B I'll stop now and solicit
any thoughts that might put this thing to rest?
Terry Smith, '59 TR3A
New Hampshire
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