The Ford Barn

5lugnuts · 03-29-2019, 02:27 PM

Fact -- Plugs show signs of too much fuel or not enough air. You saw black smoke from back of engine compartment.

If rodents are in the exhaust air can't escape so cylinders run rich. To check disconnect or just loosen exhaust pipe from manifold.

If gas is spilling into carb, the float valve might be leaking. If gas tank fuel shut off is left open for a few hours does carb get wet or drip gas? As already said, gav might not be set properly. Gently close gav, then open 1/2 to 3/4 turn.

Is choke plate operating properly? Inspect now without removing carb. Will engine run better at higher than idle rpm while parked? If yes, the issue might be gas related. If not, recheck ignition.

03-29-2019, 02:27 PM	#11
5lugnuts Senior Member Join Date: Aug 2015 Location: Clermont in Central Florida Posts: 111	Re: Sudden rough running, out of ideas Fact -- Plugs show signs of too much fuel or not enough air. You saw black smoke from back of engine compartment. If rodents are in the exhaust air can't escape so cylinders run rich. To check disconnect or just loosen exhaust pipe from manifold. If gas is spilling into carb, the float valve might be leaking. If gas tank fuel shut off is left open for a few hours does carb get wet or drip gas? As already said, gav might not be set properly. Gently close gav, then open 1/2 to 3/4 turn. Is choke plate operating properly? Inspect now without removing carb. Will engine run better at higher than idle rpm while parked? If yes, the issue might be gas related. If not, recheck ignition.