[Healeys] Backfiring thru the carbs

[Jake V]

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 at 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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