Re: what causes backfiring?

On Mon, 19 Dec 2005 22:06:44 +0000, hugh <hugh@[127.0.0.1]> wrote:

>2 causes of back fire are ignition and lean mix. If your vacuum line is
>open to air because of the grommet failure then it will be drawing air
>in to the inlet manifold below the mixer and hence weakening the
>mixture.

Hmm. It'l be nice and easy if it is just the gromit. I wonder why its
only just started doing it badly today though.

Come to think about it, it wouldnt start one day last week and i found
that was because that vacuum line was disconnected. It backfired then
too. (just the once as i cranked it without the line connected).
That seemed to be an isolated insident though as i've done about 3-400
miles since then.

>I don't think nearly empty tank will have anything to do with it. I run
>a V8 4.0 litre and I run my tanks right down to empty regularly and
>never have a problem.

I'm sure it feels better when it has a full tank. Could just be me
imagining it though - the LPG gauge is crap (I can do 50 miles with
the empty light on and it still doesnt take a fill to the capacity i
expect!), and i get nervous about running out! (since i have to get
out and refit some of the carb to make it run on petrol again!)
.

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