[Healeys] Austin Healey 100 Misfire Diagnosis.

Thu Sep 29 13:24:06 MDT 2022

What happens if you don't turn the car off when you fill it up?

On Thu, Sep 29, 2022, 11:07 AM Don Anglesey via Healeys <
healeys at autox.team.net> wrote:

> I suspect that when the tank is filled any sediment or debris around the
> tank intake is redistributed thru the fuel then it settles again.  Classic
> sign of bad fuel filter or sediment in tank.
>
> Don
>
>
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows
>
>
>
> *From: *Michael Salter <michaelsalter at gmail.com>
> *Sent: *Thursday, September 29, 2022 8:10 AM
> *To: *Alan Seigrist <healey.nut at gmail.com>
> *Cc: *Healey list <healeys at autox.team.net>
> *Subject: *Re: [Healeys] Austin Healey 100 Misfire Diagnosis.
>
>
>
> Thanks to all who have obviously given this misfire issue considerable
> thought. I will be sure to check all suggestions.
>
> I  should like to point out however that it is the immediate vanishing of
> the misfire after filling the fuel tank that has me confused.
>
> This has happened three times simce the problem appeared.
>
> I just don't understand how an ignition problem could change as a result
> of filling the tank.
>
> Furthermore I'm convinced that this is not a fuel starvation problem
> because the amount of engine power being used has no effect.
>
> Totally baffled.
>
> Thanks again to all ... I'll  report back.
>
>
>
> On Thu., Sep. 29, 2022, 9:14 a.m. Alan Seigrist via Healeys, <
> healeys at autox.team.net> wrote:
>
> Hi John -
>
>
>
> Yes, that was the point I was trying to make, sorry if it fell through bad
> interpretation!  As Ed McMahon used to say, "You Are Correct Sir!"
>
>
>
> Cheers,
>
>
>
> Alan
>
>
>
> On Thu, Sep 29, 2022 at 7:53 PM john harper <ah100tech at gmail.com> wrote:
>
> Alan
>
>
>
> Coils can fail with heat and then recover when cooled. I had one that had
> these symptoms and when looking closely I saw that the insulating oil had
> run out through a very small crack in the bottom of the case.
>
>
>
> On Thu, 29 Sept 2022 at 10:34, Alan Seigrist <healey.nut at gmail.com> wrote:
>
> Michael -
>
> Just as a follow up to my email since the symptoms seem to manifest
> themself  ...
>
>    - whether the car is warmed up or not - this typically will exclude
>    anything related to fuel or the coil
>    - whether the car is under load or not - this typically will exclude
>    anything related to fuel
>    - whether the choke is pulled or not - this typically will exclude
>    anything related to fuel
>    - somewhat intermittent but systematically under all conditions -
>    suggests to me wiring / ground issues
>
> Given this I'd check (as a priority):
>
>    - Battery Master (when these fail they will ground the coil)
>    - primary ignition wire (white) from the switch to coil (cycle the
>    connections)
>    - motor ground straps (cycle the connections)
>    - loose wires in the dizzy
>    - loose ignition wires into the dizzy or spark plug
>
> Other things to possibly do (as secondary):
>
>    - replace rotor
>    - replace dizzy cap
>
> I don't think it would be contacts or condensor simply because this would
> either be very regular all the time, or maybe sensitive to temp.
>
> Best,
>
>
>
> Alan
>
>
>
> On Thu, Sep 29, 2022 at 4:46 PM Bob Spidell <bspidell at comcast.net> wrote:
>
> re: "... I don’t recall if that wire is separate from the distributor wire
> ..."
>
> It is (or should be). If the battery switch is in the 'OFF' position it
> grounds the coil primary so no spark.
>
> On 9/28/2022 8:34 PM, Alan Seigrist wrote:
>
> Hi Michael -
>
>
>
> Have you tried cycling the connections on the white wire from the ignition
> switch to the coil, and also from the coil to the distributor.
>
>
>
> You might also want to try disconnecting the black and white wire at the
> coil from the battery master switch - if it’s failing you’ll get weird
> symptoms like this.  If that wire is disconnected the car should run no
> problem.  I don’t recall if that wire is separate from the distributor
> wire, if it isn’t you’ll have to disconnect it from underneath the master
> switch itself.
>
>
>
> Best,
>
>
>
> Alan
>
>
>
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