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Backfiring!

To: "BC Cars" <british-cars@autox.team.net>, "MG cars" <mgs@autox.team.net>
Subject: Backfiring!
From: "John Hed" <john_hed@wssagw.chinalake.navy.mil>
Date: 26 Sep 1996 06:14:24 -0700
                       Subject:                               Time:06:01
  OFFICE MEMO          Backfiring!                            Date:9/26/96

Hi all!  I was hoping for a little quick advice from all you experienced folk
out there to (hopefully) get me in the right direction on a problem I've never
dealt with before.  

I just bought a 71 MGB (couldn't resist the price) in average daily driver
shape.  The first problem I have to tackle is that it backfires!  On almost
every normal shift, I'll get a little backfire during the shift.  If I
deliberatly try and shift VERY fast, I can avoid the backfire a lot of the
time.  I checked and reset the static timing with no change.  The PO had
installed a brand new vacuum unit on the distributor and the hose to the
manifold looks good.  Should I check it dynamically with a timing light?  

I removed the two middle spark plugs and the #2 plug (front carb) looked
perfect, but the #3 plug was black, indicating too rich a mixture on the back
carb.  Could a problem with the back carb (too rich a setting or flooding due
to bad needle valve) be causing the backfire?  I plan on removing the carbs
and overhauling them anyway.  Any other ideas are greatly appreciated.

John Hed
<John_Hed@WSSAGW.chinalake.navy.mil>
71 MGB.....  new daily driver
71 MGB-GT.....  nicely restored and weekly driver
58 MGA......  in parts awaiting restoration




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