[Healeys] ignition miss

[Alan Seigrist]

Eric -

I have found that almost always when you have "missing" under acceleration
or higher RPMs when you start accelerating that it is typically a fuel
delivery problem.  Common culprits are rust in the tank that fouls up the
fuel filters or fuel pump.  Also, if you have fiddled with the fuel tank
recently (maybe etched and coated it?) that can also be a contributor.  A
fuel pump that is failing can also cause this problem.

If there is a fuel filter on the fuel line, try replacing that first with a
new, clean filter.

An easy diagnosis is when the car starts "missing" immediately switch off
the ignition and coast to a stop on the side of the road.  Pull off the top
of the float chambers on the SU carbs - if the float chambers are half empty
or dry, this is your problem.

Last but not least you should always replace the dizzy rotor!

Alan



On Sun, Aug 24, 2008 at 12:05 PM, Brits'n'Pieces (Eric Frenken) <
lists at brits-n-pieces.com> wrote:

> Hello,
>
> a friend of mine has a BJ8 with stock engine (but Getrag gearbox) but
> Mallory distributor without vacuum advance. When he runs the car between
> 2,000 and 2,500 rpm and starts to slightly accelerate his engine starts to
> misfire. It feels like as if someone switches off ignition for a split
> second and the car misfires.
>
> There's no problem running the car in either speeds below 2,000 rpm or
> above
> 2,500 rpm, full acceleration, steady speed or deceleration. He had his
> carbs
> adjusted and synchronized but this did not change the situation.
>
> Yesterday we put a new coil (high performance) in. This made the problem
> even worse. Afterwards we exchanged the Mallory distributor against an
> electronic ignition (123ignition), but forgot to connect the vacuum line on
> our first test ride (vacuum line blocked by a screw). The ignition misses
> were still there but they were not as bad as on the test drive with the
> Mallory. On our last test drive we had the vaccum hose connected and we
> nearly had no miss anymore. On his drive back home (2 hours drive) he still
> had some few ignition misses, but not as many as with the old setup.
>
> His ignition cables are new and look good. Does anybody has an idea what
> these misses can be caused by?
>
> Thank you.
>
> Eric
> Heinsberg/Germany
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