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Timing and Firing Orders
Chevy S-10
Ford F-150

If you have the correct firing order on a 302 why is it still backfiring through the carburetor?

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2015-07-16 18:31:46
2015-07-16 18:31:46

I'm sure you have one of the wires crossed or your distributor is in 180 degresse backwards

  • sound like you have it timed on the exhaust and not the compression - or 180 degrees off. Get it to TDC, rotor on the #1 plug wire, and go from there.
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You are bad out of time, or maybe you have wired the wires in the wrong rotation. It should be clockwise rotation. Check to see if you have wired it correctly, also if you have removed the distributor and reinstalled it you may be out of time.

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Because the spark plug must fire when the piston is at top dead centre of a compression stroke. If the plug fires when the piston is at any other position then you get backfiring etc and no start. The correct firing order ensures the plugs fire at the right time.

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Backfiring. Check mixture & ensure firing on all cylinders.


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