when hot no ignition connection

[callbald]

Car starts great when warm or cool.  There is no ignition circuit connection when hot - I mean nothing- dead.

When the engine cools down start instantly.   The only thing I can see being really effected by the heat is the accelerator vacuum switch.  Not sure how to test it.

 

Is there a way to bypass the accelerator vacuum switch to start the car?

 

 

 

[Akstraw]

Don't know what car you have, but if it is an electric switch, it can be bypassed.

[Frank DuVal]

But the switch on the accelerator only engages the starter solenoid. It is not part of the ignition circuit.

 

Does the starter engage but the engine does not start?

Edited July 28, 2022 by Frank DuVal (see edit history)

[avgwarhawk]

If mean no spark at the plug wires when hot, what are you running points or Pertronix?

[Alex D.]

A bad coil will fail when hot with no spark. 

[Digger914]

1 hour ago, Alex D. said:

A bad coil will fail when hot with no spark. 

And a starter motor / solenoid that's going bad won't crank.

[callbald]

sorry, 1950 buick 

[Ben Bruce aka First Born]

Callbald, do you mean no power in the starting circuit, as the starter does not run?  You ask about the vacuum switch.  If you are talking about the one on the carburetor,  it is easily bypassed.  Simply use a jumper wire between the terminals on the switch on the carb.  Or are you talking about something else?

  I will be glad to talk directly with you if you like. Send a message with a phone number, or ask in message.

 

  Ben

[Owen_Dyneto]

To jump the Carter starter switch and energize the starter, just jump from the terminal on one side to the other.  But your symptoms sound much more like the classic coil failure.

[Frank DuVal]

You have not answered is the starter motor turning the engine question when you step on the accelerator pedal. Not sure which rabbit hole to go down.