Tech'ish question. Inquiring minds want to know.

[sciroccos at earthlink.net (Jim Ruffi)]

I asked the list about this several months ago but it didn't go anywhere.
My 8V has a somewhat open muffler and does pop on decel.  It actually
bothers me because it appears to be a sign that I'm not running well.

I noticed a couple of things: (1) it doesn't pop during the first 20 secs or
so after the motor has been started and (2) the popping stops if you hold
the WOT throttle switch in the engaged position.  I wrote down a bunch of
things to check for basic diagnosis per the Bentley, but I haven't gotten
around to it.

I noodled with the ignition timing, mixture and idle quite a bit and was
able to minimize it, but it did cost me some driveability.

My mileage is 28-29, all highway, with a .81 5th, 175/70-13 tires, carrying
about 350 pounds of cargo (including me).  I thought it should be a little
better, which is why I'm interested in "fixing" the "problem", but I could
be wrong.  The motor does have ~190k on it.

Jim

----- Original Message ----- 
From: "Dan Bubb" <jdbubb@verizon.net>
To: "Scourge" <scourge@cogeco.ca>; "Scirocco List" <scirocco-l@scirocco.org>
Sent: Wednesday, May 24, 2006 8:24 AM
Subject: Re: Tech'ish question. Inquiring minds want to know.


I've noticed the same thing that Ron has. If the fuel is a little bit too
rich on the overrun it'll pop.
But, I've also noticed over the years that having a small exhaust leak near
the engine will also produce the popping.
Since there isn't much you can do with CIS to richen it up on the overrun,
maybe you should look into very small drill bits? ;^)
Dan