The air pump pumps air into the exhaust to burn any unburnt fuel, bit this
causes popping on the overrun. So the gulp valve takes the output and pumps
it into the inlet manifold on the overrun. I'd look at these areas first
rather than fiddle with the carbs.
----- Original Message -----
From: "Paul M." <rowman22001@yahoo.com>
To: "mghirsch" <mghirsch@netzero.net>; <mgs@autox.team.net>
Sent: Sunday, August 17, 2003 7:04 AM
Subject: RE: Su Mixture
> I'm starting to think it might be a valve problem.
> The car runs great - smooth and strong - but it pops
> like a bitch on overrun and is getting (at my best
> guess) around 10 mpg.
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