MISSFIRE AND NOW WON'T START

[pauls450]

CAN ANY ONE OFFER SOME ADVISE
ARRIVED HOME WITH A BAD MISFIRE ,CHECKED ALL THE LEADS AND FOUND THE VACUMN UNIT HANGING OFF I SCREWED IT BACK INTO PLACE CHECKED ALL THE OBVIOUS WIRING CONNECTION AND NOW IT WILL OCCASIONALY START BUT RUNS POORLY AND TODAY IN TRYING TO GET TO THE GARAGE, TURNS OVER BUT WON'T QUITE FIRE.
DISTRIBUTOR CAP,ROTOR ARM AND LEADS ALL REPLACED EARLIER THIS YEAR AND HAD BEEN RUNNING FINE
QUESTIONS
DOES THE VACUMN UNIT HAVE AN INTERNAL COMNNECTION IN THE DISTRIBUTOR?
ANY OTHER CHECKS I SHOULD DO?

THANKS IN ANTICIPATION

[GreenV8S]

1. the vacuum unit must be hooked onto the base plate within the dizzy. Without that the vacuum advance mechanism will be free to go wherever it wants and you will get random timing.
2. No need to shout!

[pauls450]

Found the caps lock.
Will strip the distributor tonight
Advise appreciated

[GreenV8S]

pauls450 said:

Found the caps lock.
Will strip the distributor tonight
Advise appreciated

Stripping implies remove and dismantle. No need for anything like that, just undo the two screws holding the vac cannister on and make sure the hook on the back of the cannister is engaged on the inside of the dizzy. Whatever else you might be thinking, don't under any circumstances remove the dizzy from the engine.

[spend]

Maybe off track, but sounds very similar symptoms to the infernal ignition amp reaching the end of its useful life?

You can test if its still pulsing with a multimeter and flicking the rotor arm IIRC

[pauls450]

Thanks Guys
Refitted the vac unit and back in business in no time