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Positive crank case ventilation, while the motor is running the pcv system draws engine block gases & fumes out & burns them along with the air fuel mixture via a hose connected the pcv valve that goes to the intake. Do not rum motor with the oil cap off. If there is suction while the motor is running it is normal.
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Why does engine turns off when oil cap is removed?
The engine turns off when the oil cap is removed because the engine is designed to do so. When the oil cap is removed a vacuum leak is created which causes the engine to turn off.
Why does removing oil cap stall engine?
Removing the oil cap with the engine running causes a vacuum leak in the positive crankcase ventilation. This causes too much air to enter the cylinders at once, which results in a stalling engine.
What are possible causes for pressure coming out of the valve cover oil filler cap hole on a 97 Nissan pickup.?
the cap is open
What make oil cap blow off?
Normally caused by excessive crankcase pressure. A blocked breather or bad piston rings are the likely causes.
What causes an oil cap to continue coming loose after tighteningon a Simplicity lawn tractor?
The threads are worn and the vibration of the engine causes the oil cap to loosen. Replace the oil cap or try a little teflon tape on the male thread as a temporary fix.
What causes the oil pressure gage to show 100 and above on a big truck?
High oil pressure or a faulty oil pressure gauge.
Why would a 1996 buick lesabre die when you take the oil cap off or the PCV valve off?
All new cars are Vacuum sensitive. The Oil cap and PCV valve are part of the vaccum system. If you have a vacuum leak this could cause the car to stall out.
What causes the lifters not to oil properly?
Not enough oil pressure and / or the oil channel is plugged
What causes oil leak around oil fill cap?
Check for a gasket or O-ring on the cap ( it should have one ), also check crankcase ventilation.
What causes oil to come out the filler tube or the dip stick?
Too much oil, excessive crankcase pressure ( bad piston rings ) or both. pressure causes oil to come the filter tude and capilarity is also a factor. pressure causes oil to come the filter tude and capilarity is also a factor.
What causes my oil pressure to drop in 1992 Dodge Dakota?
Not enough oil.
WHAT CAUSES LOW OIL PRESSURE IN ISX CUMMINS?
Compromised oil system, faulty engine oil rifle pressure 1 sensor.
