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September 29th, 2008

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Q & A: Sputtering

Friday March 29th, 2002
Q & A, MGA, MGB, MGC, MG T-Type, Midget
My A with 1800 B 3main/ w "race" cam & 1-3/4 SU's ran fine for the first
month or so after purchasing it. (car had been stored 12 years after
rebuild, 1200 miles on rebuild
Now has started sputtering/ bogging down when it gets hot (usually after a
trip on the highway) It idles OK, runs OK at high and low RPM's, but boggs
in mid RPM travel ~around 2500-3200RPM's...not 100% consistent. Can also
be
difficult to start when cold.
Had the SU's set up by mech. a few weeks before problems started.
Just installed Mallory dual point without vac. advance, runs great all
RPMs
when cold & warm. Get on the highway for a few miles, boggs down again.
ARRGH! New plugs, new wires, checked timing, new Lucas sport coil. Now
what?
Back to the SU's again. Never touched these things before, should I start
now or call a mechanic that knows SU's. Someone suggested going back to
H4's, but as the car ran fine when I bought it, why would I want to?? Are
the needles the place to start?? Is there any way to trouble shoot the
SU's
or is a complete rebuild the way to go? Am I barking up the wrong tree?
Any assistance or guidance would be appreciated
Andrew Kozak

ANDREW!

You've got a number of non-original parts so this may be difficult
to diagnose, sitting in an armchair 1000 miles away. Back up: the MGA ran
"fine" until you had some work done -- was that th... read more