[Mgs] 1978 MGB

PaulHunt73 paulhunt73 at virginmedia.com
Sat Jun 8 03:07:04 MDT 2019


If the plugs aren't fouled then I doubt it is the choke stuck open, but you could check that with a Colortune in from cold.  It could still be the choke though in that when that warms and removes the fast idle the normal idle screw is not open enough to maintain the engine.  Are you warm starting giving it a little throttle with the pedal?  Or just cranking feet off?  IME they need a little throttle when warm, but not cold when the choke is activated.

When it is left to get cold and you turn on the ignition again and it starts, does the fuel pump chatter away or just click a couple of times - that's if you have an SU or equivalent pump?

"no gas pouring into carb" do you mean no gas is pouring out of the carb overflow?  When it won't restart switch off and take the fuel delivery pipe off the carb and you should get a spurt of fuel.  If not direct the pipe into a container and switch on again, and you should get at least one Imperial pint per minute and in practice double that, in a continuous series of pulses with minimal bubbling.

PaulH.
  ----- Original Message ----- 
   
  Starts when cold, no problem.  runs at 2500 to 3000 rpm no problem.

   

  Let it go down to 1000 or so and it dies.  Will not restart.
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