Worn Valve Guides. Oil starvation is a common problem on 351 Clevelands which can cause the valve guides to receive inadequate amounts of oil and therefore wear down more quickly than they normally would. If the guides are excessively worn the valves can get off-track and close against the seat at a slight angle, eventually leading to crackedSome of the likely causes include, Faulty injectors – stuck open. Worn piston rings or cylinder glazing. If equipped with glow plugs, could be faulty plugs or module. Remember, if you have an older engine with really low compression and bad timing or low injection pressure, you are more likely to have white smoke. zombie1969. Check if the PCV valve is working properly.A plugged PCV or collapsing vacuum hose will cause excessive crank case pressures and blow oil from every seal or gasket. "Suddenly is has some serious blowby and at both the oil filler tube at the front of the intake manifold and from the road draft tube at the rear of the block. ".
The ford PCV system sucks. We all know that, but here's why. There is a nipple coming off of the valvecover that has a hose running to the throtle body. This is were the problem lies! See, when under vacuum, say at idle, the PCV is sucking (20 inches of vacuum on my car) all the air it can out of the crankcase, BUT becuase that little hose is
Any fault that affects intake manifold vacuum will skew the MAF calculation on a speed density system. EGR leaks and incorrect base ignition timing frequently skew the speed density calculation of MAF. Increased EGR flow due to leaks or sticking valves will generally increase fuel and EGR flow, but decrease ignition advance.
If a car loses oil but has no visible leaks, the oil may burn inside the engine. This can occur when the engine’s piston rings and valve seals wear out over time, allowing oil to seep into the combustion chamber and burn along with fuel. Another possibility is that the engine’s PCV system is malfunctioning, causing oil to be pulled into the 7LX2eIA.