[Healeys] Austin Healey 100 Misfire Diagnosis.

Thu Sep 29 20:08:25 MDT 2022

Michael--

You have to remember that when talking about problems with a
Healey the unlikely sometimes becomes probable.  If you haven't already
done so I would suggest that you drain and flush the tank either in situ or
out of the car.

On Thu, Sep 29, 2022 at 10:02 PM Michael Salter <michaelsalter at gmail.com>
wrote:

> BUT ... the fact that full throttle and climbing a slope with no change in
> the amount of misfiring tends to negate fuel blockage as a cause.
> I'm starting to think that the refueling situation is something of a "red
> herring" although it certainly is an odd one.
>
> On Thu., Sep. 29, 2022, 9:23 p.m. Alan Seigrist, <healey.nut at gmail.com>
> wrote:
>
>> 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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