The Ford Barn - View Single Post - New misfire

topfuel724 · 02-26-2021, 04:47 PM

Had 2 sticking exhaust valves #4 and #5 in a 8BA recently. With the exhaust valves in the open position sprayed the stems and guides through the spark plug hole with "Brake Clean" and also MMO. Let them set for a couple of days and tapped them down with a brass punch making sure that the cylinders were on the back side of the cam. I believe the sticking was caused by old gas. Topped the tank off with non-ethanol fuel and some MMO. No sticking since.

02-26-2021, 04:47 PM	#11
topfuel724 Member Join Date: Oct 2011 Location: Fort Worth, Texas Posts: 71	Re: New misfire - sticky valves? Had 2 sticking exhaust valves #4 and #5 in a 8BA recently. With the exhaust valves in the open position sprayed the stems and guides through the spark plug hole with "Brake Clean" and also MMO. Let them set for a couple of days and tapped them down with a brass punch making sure that the cylinders were on the back side of the cam. I believe the sticking was caused by old gas. Topped the tank off with non-ethanol fuel and some MMO. No sticking since.