From Weslyn.
4.9 stright 6 1993 f150 xlt
Dies after 10 min
Check fuel sock in the tank , fuel filter , evaporative system fuel cap and calatic converter. Fuel tank could be pulling a vacuum.
Inline fuel filter mounted inside the driver’s side frame rail, roughly aligned with where the front of the truck bed meets the back of th
I have a pressure gage for the fuel rail.
#6 Valves dry:
Let’s put an overdose of SeaFaom in the oil and run it, on the chance a minor blockage of baked on oil will clear.
Also lets blip the throttle above idle, and see if some oil comes out of #6.
AI SLOP.:
Causes of Dry Valves on Cylinder #6
- Clogged Pushrod: The hollow pushrod for that specific rocker arm is plugged with sludge or carbon, stopping oil from flowing up to the rocker.
- Blocked Oil Galley / Deck Hole: The oil passage hole in the engine block or cylinder head gasket near the rear of the engine (cylinder 6 is at the very back) is blocked by gasket material, RTV sealant, or heavy sludge buildup.
- Excessive Rocker Arm Clearance / Worn Shaft: Excessive wear between the rocker arm and shaft can bleed off oil pressure elsewhere, starving the end of the train.
- Misaligned Head Gasket: A head gasket installed incorrectly or slightly misaligned can partially or completely block the oil feed port leading to the upper valvetrain at the rear of the block.
How to Check and Fix It
- Remove the Valve Cover: Start the engine briefly (be prepared for some oil mess) and see if oil is pumping up through the pushrods to the other rockers and why #6 is bone dry.
- Clear the Pushrod: Pull the pushrod on cylinder #6 and blow compressed air through it or run a thin wire down the center to clear any trapped debris.
- Inspect the Oil Feed: Check if oil is making it to the cylinder head deck at the rear of the engine. If no oil reaches the head at all, a blocked galley or misaligned gasket during a past repair is the likely culprit.