Backfiring and refusing to idle

My 2.25 petrol engine has just started to do this today, on the overun when
I am slowing down for a juntion or traffic lights it backfires and dies, it
takes one hell of a lot of revs to keep it going. However when I am
stationary it ticks over fine. Any ideas?

Only thing that happened recently was the condenser or whatever it is that
sits next to the coil became dissatached and I am not sure whether I
reconnected it to the right side, (negative) does that do anything anyway or
is it just there to suppress interference?


--
Larry
Series 3 rust and holes

Well the suppressor doesn't seem to have anything to do with it, I have
disconnected it and it is still backfiring and dying.

Perhaps its just as well it going in the have the engine looked at under
warranty in a couple of weeks anyway.


--
Larry
Series 3 rust and holes

"Larry" <[email protected]> wrote in message
news:[email protected]...
> My 2.25 petrol engine has just started to do this today, on the overun
when
> I am slowing down for a juntion or traffic lights it backfires and dies,
it
> takes one hell of a lot of revs to keep it going. However when I am
> stationary it ticks over fine. Any ideas?
>
> Only thing that happened recently was the condenser or whatever it is that
> sits next to the coil became dissatached and I am not sure whether I
> reconnected it to the right side, (negative) does that do anything anyway
or
> is it just there to suppress interference?
>
>
> --
> Larry
> Series 3 rust and holes
>
>

Larry wrote:

|| Well the suppressor doesn't seem to have anything to do with it, I
|| have disconnected it and it is still backfiring and dying.
||
|| Perhaps its just as well it going in the have the engine looked at
|| under warranty in a couple of weeks anyway.
||
||
|| --
|| Larry
|| Series 3 rust and holes
||
|| "Larry" <[email protected]> wrote in message
|| news:[email protected]...
||| My 2.25 petrol engine has just started to do this today, on the
||| overun when I am slowing down for a juntion or traffic lights it
||| backfires and dies, it takes one hell of a lot of revs to keep it
||| going. However when I am stationary it ticks over fine. Any ideas?
|||
||| Only thing that happened recently was the condenser or whatever it
||| is that sits next to the coil became dissatached and I am not sure
||| whether I reconnected it to the right side, (negative) does that do
||| anything anyway or is it just there to suppress interference?
|||
|||
||| --
||| Larry
||| Series 3 rust and holes

It might be a ballast resistor rather than a condenser, in which case the
coil will overheat without it, and give the symptoms you describe.

I fitted a new coil to the S2a along with all the electrical consumables
prior to a long trip. The supplier gave me one from a later model which
needed a ballast resistor, but I wasn't aware of this until the engine
started to misfire when it got fully warm. Idling was fine, and it ran OK
from cold, but once warm it farted and banged like it was going to die.
Took me a while to isolate the problem as you tend to think that a coil is
just a coil, and I looked everywhere else first. I finally sussed it when I
touched the coil after a run and could have fried an egg on it. I replaced
the coil with the old one and it has run fine ever since. I don't know
which side of the coil the resistor goes, as I've never had one, but it
sounds like that might be yer problem.

--
Rich
==============================

I don't approve of signatures, so I don't have one.

Well whatever side I connect the doodah to makes no difference of course
running with it the wrong way round if it is a ballast resistor wouldn't
help the coil I suppose, nothing for it but to put the original coil on and
connect the doodah the opposite way to how I fitted it by guesswork.

Knowing my luck it is nothing to do with the coil at all, but I can only try
I suppose.

--
Larry
Series 3 rust and holes

"Richard Brookman" <[email protected]> wrote in message
news:[email protected]...
> Larry wrote:
>
>
> It might be a ballast resistor rather than a condenser, in which case the
> coil will overheat without it, and give the symptoms you describe.
>
> I fitted a new coil to the S2a along with all the electrical consumables
> prior to a long trip. The supplier gave me one from a later model which
> needed a ballast resistor, but I wasn't aware of this until the engine
> started to misfire when it got fully warm. Idling was fine, and it ran OK
> from cold, but once warm it farted and banged like it was going to die.
> Took me a while to isolate the problem as you tend to think that a coil is
> just a coil, and I looked everywhere else first. I finally sussed it when
I
> touched the coil after a run and could have fried an egg on it. I
replaced
> the coil with the old one and it has run fine ever since. I don't know
> which side of the coil the resistor goes, as I've never had one, but it
> sounds like that might be yer problem.
>
> --
> Rich
> ==============================
>
> I don't approve of signatures, so I don't have one.
>
>

Larry <[email protected]> uttered summat worrerz funny about:
> Well whatever side I connect the doodah to makes no difference of
> course running with it the wrong way round if it is a ballast
> resistor wouldn't help the coil I suppose, nothing for it but to put
> the original coil on and connect the doodah the opposite way to how I
> fitted it by guesswork.
>
> Knowing my luck it is nothing to do with the coil at all, but I can
> only try I suppose.
>
>

Has the Dizzy had a knock? Id it clamped tight? Is the Dizzy cap on tight?
How about Dirt in the Dizzy cap , tracking in the Dizzy cap, Crapped up rota
arm.

my money is on the timing / dizzy being out.

What bought it on? was it after a trip under the bonnet or just of it's own
accord?

Lee D

"Larry" <[email protected]> wrote in message
news:[email protected]...
> My 2.25 petrol engine has just started to do this today, on the overun
> when
> I am slowing down for a juntion or traffic lights it backfires and dies,
> it
> takes one hell of a lot of revs to keep it going. However when I am
> stationary it ticks over fine. Any ideas?
>
> Only thing that happened recently was the condenser or whatever it is that
> sits next to the coil became dissatached and I am not sure whether I
> reconnected it to the right side, (negative) does that do anything anyway
> or
> is it just there to suppress interference?
>
>
> --
> Larry
> Series 3 rust and holes
>

If its one wire from the coil to the condensor which is screwed to the inner
wing its an interference suppressor taking it off should make no difference
.. Theres a lot of stuff that can cause backfire type problems vacuum advance
sticking ,dodgy capacitor ,crappy earth wire to distributer baseplate,
points set wrongly - points are funny things they can change settings
without help or even carb problems like excess fuel -- but if its under
warranty get it back in pronto must confess tho' I didn't know S III 's had
a ballasted coil I thought it was just the V8's
Derek

Turns out to have been a bad LT connection to the dizzy. It runs fine now,
no longer sounds like I am mounting a single handed assualt on Kabul when
ever I am slowing down.


--
Larry
Series 3 rust and holes


"Lee_D" <[email protected]> wrote in message
news:[email protected]...
> Larry <[email protected]> uttered summat worrerz funny about:
> Has the Dizzy had a knock? Id it clamped tight? Is the Dizzy cap on tight?
> How about Dirt in the Dizzy cap , tracking in the Dizzy cap, Crapped up
rota
> arm.
>
> my money is on the timing / dizzy being out.
>
> What bought it on? was it after a trip under the bonnet or just of it's
own
> accord?
>
> Lee D
>
>

On or around Tue, 4 Jul 2006 17:12:07 +0100, "Larry" <[email protected]>
enlightened us thusly:

>Turns out to have been a bad LT connection to the dizzy. It runs fine now,
>no longer sounds like I am mounting a single handed assualt on Kabul when
>ever I am slowing down.

oh yes, BTDT. sod to track down as well.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"My centre is giving way, my right is in retreat; situation excellent.
I shall attack. - Marshal Foch (1851 - 1929)

On Tue, 4 Jul 2006 17:12:07 +0100, "Larry" <[email protected]>
wrote:

>Turns out to have been a bad LT connection to the dizzy. It runs fine now,
>no longer sounds like I am mounting a single handed assualt on Kabul when
>ever I am slowing down.

i drove a saab with a cracked head for a while. I quite liked the
backfiring that did when i slowed down or reversed. people would
almost dive for cover!

Im currently driving another saab with fuel pump problems and that
bacfires a lot when youre coasting if it drops too lean. I've got to
say im tempted to make it do it on purpose!