[Healeys] The single most confusing engine shutdown problem ever!

[Harold Manifold]

Sounds like you have checked everything on the ignition system. Could be fuel related. What do the spark plugs look like? If the ceramic is black then too rich if white then too lean. Lastly there is the ground wire that runs from the coil to the battery shutoff switch. Could the wire be grounding somewhere? Try disconnecting it at the coil.

Harold

> On Sep 17, 2023, at 9:15 AM, Richard Collins via Healeys <healeys at autox.team.net> wrote:
> 
>  Does it do it only in summer type warm weather ?
> If so, I’d say vapor lock of fuel system.
> Happens to me in the summer and predicted to happen when water temp on my instruments hit 200 degrees when stopped. Although I have wrapped insulation around the lines leading to the carbs close to the manifold which helped but has not cured the issue. I do have a heat shield but haven’t installed it.
> So my cure is not to drive on hot days.  
> 
> Regards,
> Richard C
> BN7 #440
> 
>>> On Sep 17, 2023, at 10:22, Tom Felts via Healeys <healeys at autox.team.net> wrote:
>>> 
>> 
>> Was our driving a while back, engine purring, and suddenly she shut down.  Let it sit for a while and she would start and run for a while--then shut down again.  I tried many fixes which I will list below.  Several times after the fixes she went for miles and miles and I thought I had "fixed" it.  Nope-----yesterday----it was AAA tow time once again (3 times this year).  
>> 
>> The last 2 shutdown times came when she was idling waiting for a light or for a car to pass.
>> 
>> So here is what I have tried:  * new coil  * new voltage regulator  * new fuel pump  * New ignition switch  * Blew out the fuel lines * pulled float bowls and cleaned them (no debris inside)  * Pulled the distributor plate out and cleaned and oiled it  * disconnected the wire leading from the battery cutoff switch to the coil. * bypassed the entire battery cutoff switch * replaced the Pertronix with a new one  * checked all the sparkplug wires to make sure they were on properly  *  replaced the distributor rotor *Replaced the distributor cap . * checked the small ground wire inside the distributor to make sure it was attached properly.
>> 
>>  All this----and STILL o joy.  I'm really out of ideas at this point.  If anyone has any ideas for me to check please share them.
>> 
>> Thanks
>> Tom
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