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
|