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"hanging" revs...

To: mgs@autox.team.net
Subject: "hanging" revs...
From: "Paul M." <rowman22001@yahoo.com>
Date: Wed, 7 May 2003 12:44:04 -0700 (PDT)
Many thanks to all for helping with my "heel ond toe"
quandry.  I think I'm well on my way to having it
licked, with everyone's great advice and help.

Moving forward (remember that I've only owned this car
five days, so expect the questions to keep coming in a
flurry for a short while yet...), I have an issue with
the way the engine responds off throttle that I find
perplexing.

This car is a 1971 tourer, and the engine compartment
is remarkably unmolsted.  All of the factory emissions
equipment is in place and working well.  It fires
right up, idles great, and runs smooth and docile. 
But it does something that I find strange:

If I'm at idle, and I blip the throttle, the engine
responds quickly and revs freely, but when I lift off
the pedal, the revs kinda "hang" up there and come
back down to idle somewhat slowly.  Not REAL slowly,
but just a little slowly...  Is this a function of the
air pump or something?  My old B was a 1963, and it
didn't do this at all.  One thought is that it could
be the simple fact that it's a 5-main engine and I'm
used to the more responsive 3-main.  Another thought
is that it's the air pump and related emissions
controls stuff, and "desmogging" it might help
(although I am loathe to do that, since it's running
so nice and since I would feel bad about yanking
everything off a good original engine), and a third
thought I had is that the dashpot oil might be too
thick or something (in which case a recommendation on
what to use would be wonderful...)

Any thoughts?  Do all later B's do this?

Thanks again,
Paul
1971 MGB Tourer
(Still searching for a nickname, but leaning towards
"The Pumpkin", since it's blaze...)

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