1966 Mercury Comet stalls when warmed up

Tiny
PAUL AHRENDT
  • MEMBER
  • 1966 MERCURY COMET
  • V8
  • 2WD
  • AUTOMATIC
  • 67,070 MILES
Just had shop put in rebuilt C4 tranny. Idle spd was too high, and tranny shifted hard. When I drive it short distances I have no problems. Its when I drive more than 4miles, or on freeway that stalling begins. My car stumbles and acts like its not getting enough fuel. If I try pumping gas pedal, it cuts out. Stalls motor. If I let off gas pedal it stays running at slower and slower rate, until attempts to maintain speed cause it to stall. What I have tried so far has failed to stop this behavior. This is what I have done so far. 1)adjusted choke cold idle spd down, adjusted both air/fuel screws one full turn out past "bog" point. So now car idles nornally, and shifts smoother also. 2)replaced air & fuel filters, added gas treatment. 3)checked fluid levels. Stalling behavior pursists.
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Wednesday, October 14th, 2009 AT 8:12 AM

1 Reply

Tiny
HMAC300
  • EXPERT
From what you describe, I would take a fuel pressure test, meaning flow as well as pressure. Then go into distributor and check breaker plate for wear and vacuum advance for wear at pin and pin hole. I am assuming this has the original distributor with points. It could also need a carb overhaul as well, due to age and the alcohol in todays fuel. Especially if this has a plastic float in the carb.
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Thursday, November 12th, 2009 AT 7:08 PM

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