[Healeys] Austin Healey 100 Misfire Diagnosis.

[Alan Seigrist]

Good point.  I had a very similar experience when I had mistakenly used
high heat silicone to seal the fuel tank sender, and I didn’t know that
fuel caused flakes of it to fall off and plug the pickup intermittently.

On Fri, 30 Sep 2022 at 4:38 AM, Michael Oritt <michael.oritt at gmail.com>
wrote:

> I had a similar miss that was caused by a leaf that had gotten into the
> tank.  It would be pulled against the pickup by fuel flow and cause the
> engine to lose power on all cylinders, as opposed to a miss.  When I either
> got off the gas pedal or shut the engine down the leaf would apparently
> fall away from the pickup and everything would be fine until the leaf was
> once again pulled against the pickup, etc. etc.
>
> I empirically came up with this theory after I pulled the fuel sender,
> searched around in the tank with a flashlight and found the leaf, and after
> I removed it the miss went away.  How the leaf got into the tank when the
> fuel filler is inside the boot is a larger issue I never figured out.
>
> Best--Michael Oritt
>
>
> On Thu, Sep 29, 2022 at 11:01 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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