[Healeys] Austin Healey 100 Misfire Diagnosis.

Michael Salter michaelsalter at gmail.com
Thu Sep 29 20:01:51 MDT 2022


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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