back firing and rough idle

1972 FORD CORTINA
1 MILES • 1.6L • 4 CYL • 2WD • MANUAL
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COLAN H
  • MEMBER
  • 1 POST
brand new engine fitted and fully reco carb also fitted ,genuine weber ,downdraft
Jun 10, 2019 at 9:29 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Welcome to 2CarPros.

Is the back fire through the carburetor or exhaust? Have you checked for vacuum leaks which can cause this? How was the carburetor adjusted?

Here are a couple links you may find helpful:

https://www.2carpros.com/articles/engine-backfires-while-running

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Also, are you certain that you have all ignition wires to the correct cylinders?

Let me know.

Joe
Jun 11, 2019 at 9:25 PM
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