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Re: [Healeys] Backfiring thru the carbs

To: Craig Cooper <craiginchico@gmail.com>
Subject: Re: [Healeys] Backfiring thru the carbs
From: Jake V <britishauto@gmail.com>
Date: Sat, 27 Sep 2025 21:54:35 -0400
Cc: Healey List <healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <CABWqUyk6F26KiPFGXAshdqn=NfKcZ2TVeNHZ+Ce-gzj0u4AQmA@mail.gmail.com>
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The booster vacuum take off is on the aft end of the intake manifold.
I had similar issues right when I started up my BJ8 project for the first
time. Turns out I had swapped #2 and #4 plug wires in the cap when I made
new ones.
Swapped them to correct, the car fires right up and idles beautifully, no
backfiring at all thru the carbs.
I had reset the valves and adjusted the timing by ear to a few degrees
advanced.
Jake

On Sat, Sep 27, 2025, 9:46 PM Craig Cooper <craiginchico@gmail.com> wrote:

> How about a big vacuum leak?  It's noted the car here hasn't run for a
> long time.  Could be worth checking the vacuum line from the manifold to
> the brake booster.  Might be worth checking.  Where does the vacuum to the
> booster on a BJ8 come from?
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<div dir=3D"auto">The booster vacuum take off is on the aft end of the inta=
ke manifold.<div dir=3D"auto">I had similar issues right when I started up =
my BJ8 project for the first time. Turns out I had swapped #2 and #4 plug w=
ires in the cap when I made new ones.</div><div dir=3D"auto">Swapped them t=
o correct, the car fires right up and idles beautifully, no backfiring at a=
ll thru the carbs.</div><div dir=3D"auto">I had reset the valves and adjust=
ed the timing by ear to a few degrees advanced.</div><div dir=3D"auto">Jake=
</div></div><br><div class=3D"gmail_quote gmail_quote_container"><div dir=
=3D"ltr" class=3D"gmail_attr">On Sat, Sep 27, 2025, 9:46 PM Craig Cooper &l=
t;<a href=3D"mailto:craiginchico@gmail.com";>craiginchico@gmail.com</a>&gt; =
wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e=
x;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div dir=3D=
"ltr"><div class=3D"gmail_default" style=3D"font-size:large">How about a bi=
g vacuum leak?=C2=A0 It&#39;s noted the car here hasn&#39;t run for a long =
time.=C2=A0 Could be worth checking the vacuum line from the manifold to th=
e brake booster.=C2=A0 Might be worth checking.=C2=A0 Where does the vacuum=
 to the booster on a BJ8 come from?=C2=A0</div></div>
</div>
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