The Ford Barn - View Single Post - backire through carburator on 1946 8 cylinder

rotorwrench · 11-25-2019, 06:24 PM

Sometimes one thing can cause another. Back fire up through the venturis is generally caused by a lean condition in fuel delivery but as several folks mention, this backfiring can damage the power valve on a model 94. When they are that lean it usually indicates a plugged up fuel delivery line, jet, or port. I definitely won't idle worth a crap with a blown power valve but it will enrich the idle mixture.

If an ignition system is out of time then a back fire can happen if the plug fires while an intake valve is open but that can happen with a stuck valve too.

11-25-2019, 06:24 PM	#13
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,422	Re: backire through carburator on 1946 8 cylinder Sometimes one thing can cause another. Back fire up through the venturis is generally caused by a lean condition in fuel delivery but as several folks mention, this backfiring can damage the power valve on a model 94. When they are that lean it usually indicates a plugged up fuel delivery line, jet, or port. I definitely won't idle worth a crap with a blown power valve but it will enrich the idle mixture. If an ignition system is out of time then a back fire can happen if the plug fires while an intake valve is open but that can happen with a stuck valve too.