As a recap, last week, I wrote in about a little
surging when the car isn't warmed up yet, or after several
mile both at higher (65-70mph) sustained speeds.
Many suggested fuel pump. And Paul Hunt, of course, gave a
great step-by-step (fuel pump, plugs, points, timing, then
carb setup).
And this morning, I was able to open it up (ie try to keep
up with traffic on I-94) a bit, and I didn't have an issue.
More testing will come. But today, the problem seems gone.
So here's what I did:
1) Checked the fuel pump was pumping at least 1 Imperial pint
in a minute. That's 20oz. It did.
1.5) When doing that, I find that my return springs for the throttle
and choke are broken. A run to Checker Auto parts for some substitutes
and a new set of feeler gauges to replace the MIA ones. They, of course,
showed up that evening. :-)
2) Replaced the springs.
3) Checked the plugs, 3 years old. I don't know the milage, I'll have to
see how much I've driven these past summers. Color good, gaps are pretty
close. Edges are a bit rounded in places. They are NGK. Wires look good.
They are red (Magencor?) Ordered replacement anyway, regular type.
4) Checked the timing. I have a pertronix. It is good (maybe 12dBTDC), I
adjust anyway.
I didn't have time, this was Saturday to adjust the carbs. But 3 weeks
ago, I'd pulled the front carb to adjust the float, as I was
overflowing. It was way off. And I'd tried out the Color Tune, and found
that, I had them adjusted correctly by ear. :-) Oh, sorry, these are
HIFs.
It's raining, so no test drive.
That brings us up today.
So what caused it? If indeed it is fixed?
Could the broken return spring have done it? the springs on the throttle
shafts are in good working order. And the chokes are fine. I rebuilt the
carbs last year.
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______ Paul T. Root
/ _ \ 1977 MGB
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