[Healeys] Austin Healey 100 Misfire Diagnosis.

Roger Grace roggrace at telus.net
Mon Oct 3 13:15:12 MDT 2022 

Do give the cap an eagle eye too - maybe also with a magnifying glass - I
had a bad experience with a hairline crack on a Lucas cap on a Mini many
years ago ... it was hardly visible and you know how HT can track ..
rg

On Mon, Oct 3, 2022 at 10:05 AM Michael Salter via Healeys <
healeys at autox.team.net> wrote:

> This is a non-progress report.
> I found a few minutes to continue my efforts to trace this misfire fault.
> Removed the LT wire from the distributor and from the 2 coil terminals.
> Ran a jumper from the CB terminal of the coil to the distributor and a
> second jumper from the live starter solenoid terminal to the SW terminal of
> the coil, thus eliminating things like the ignition switch and the battery
> master switch.
> Absolutely no change. In fact possibly worse.
> Next I'll pull out the distributor and check all the internal wiring, fit
> a different rotor and install a substitute coil.
> Stay tuned for further bulletins.
>
> M
>
> On Fri., Sep. 30, 2022, 12:41 a.m. Roland Wilhelmy, <sentenac.rw at gmail.com>
> wrote:
>
>> So what is unique to a fuel stop besides the fuel?  Adding weight to the
>> boot area, opening the boot lid, removing the filler cap.  What else?
>>
>> An unvented filler cap could restrict fuel flow.  Extra weight  and even
>> opening the boot lid could shift some recalcitrant ground or other
>> connection or loose shorted wire. Maybe even at the battery switch.
>> -Roland
>>
>> On Thu, Sep 29, 2022, 8:12 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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