What causes oil in the air intake manifold?
It is not rare to have blocked PCV valves on cars with less than 100,000 mileage. You have to examine the entire PCV system. A faulty one will cause an imbalance of air flow and send some oil in air intake.
Where does the oil go when the PCV valve is blocked?
When oil cannot pass freely through the passage, it gathers inside the top of the cylinder head. When the passage is totally blocked, the oil will go through the PCV valve and enter the air intake manifold. What you have to do to get rid of this problem is to pour an engine flush formula into the oil and run the engine for a few times.
What are the symptoms of a bad intake manifold?
Common signs include difficulty starting the engine, the Check Engine Light coming on, engine misfires, and a decrease in power and acceleration. 1. Difficulty starting the engine 2. Engine misfires and decrease in power, acceleration, and fuel economy
What are the symptoms of a bad VVT solenoid?
Here are the symptoms that you must look out for to know that the VVT solenoid is failing or is not functioning well: 1. Check Engine Light On This is the thing about modern cars that the ECU or engine control unit starts to warn you as soon as it finds some problem in the engine.
What causes a clatter noise when a valve is closed?
A valve can also float because of a broken valve spring. Usually, the clearance between the valve stem and rocker arm widens and causes a clatter noise too. Although mechanical problems are the main cause of a floating valve, excess engine speed can also prevent a valve from closing properly, leading to engine performance problems.
What causes an engine to clatter when accelerating?
There are guides for engines with a timing chain. Both vehicles with a timing belt or a chain have a tensioning system to keep it snug and centered. If the timing belt or chain tensioner loses its strength, the belt/chain has more movement than it should have. This causes engine clatter when accelerating and the engine clicks as it hits the guides.
What causes a valve to float on a gas engine?
Usually, this happens because of a weakened or broken valve spring. A weakened spring is more common on high-mileage engines. After miles of service the spring loses strength, allowing the valve to float. A valve can also float because of a broken valve spring.
What makes a lifter rattle when you let go the throttle?
I have never heard a lifter have a random rattle when you let go the throttle. Usually its a tap tap sound that follows the RPM of the engine.