Hi, Evangelos.
Over-run backfires in the exhaust can often be caused by an air leak into
the exhaust so check the mainfold and pipes, especially before the muffler.
BTW, If you have Outlook Express, .sig files are under 'Tools', 'Options',
'Signatures'.
Regards,
Dave H.
'72 BGT.
----- Original Message -----
From: Evangelos G. Makris <xirias@hol.gr>
To: <Ajhsys@aol.com>
Cc: <mgs@autox.team.net>
Sent: Wednesday, August 16, 2000 6:41 PM
Subject: Re: backfiring
> Allen,
> I'm getting exhaust explosions! Mixture isn't that rich because the
sparkplugs
> have the correct beige colour. Sorry, I don't know where to keep a *.sig
file so
> that it adds itself to the bottom of every email I send out but in any
case my B
> is a 1973 GT with the earliest HIF carbs (434's), which means that unless
someone
> has tampered with them before I got this car, they must still have the
> non-overrun-valve throttle discs
>
> Evangelos
> 73 GT
> 66 Sprite
> 78 Mini
> 60 A40
>
> Ajhsys@aol.com wrote:
>
> >
> > Are you getting a backfire through the carbs, or an exhaust explosion
out the
> > tailpipe? Terminology differs!
> >
> > Backfire thru the carbs can be an exhaust valve not closing. Exhaust
> > explosion can be a too rich mixture or incomplete combustion. Raw gas
is
> > exploding when it hits the exhaust manifold.
> >
> > Sorry I don't remember what year and model car you have, but later cars
with
> > emission controls can have all of these symptoms if the hardware isn't
> > working correctly. BTW, if you add your car info to your .sig file, you
> > won't forget to put it in your posts.
> >
> > Allen Hefner
> > SCCA Philly Region Rally Steward
> > '77 Midget
> > '92 Mitsubishi Expo LRV Sport
>
>
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