Is it normal to have oil in the intake manifold?

Is it normal to have oil in the intake manifold?

Re: Oil in the Intake Manifold. It is normal for there to be some oil in your intake manifold due to the PCV valve. This allows pressure to be released from the top of your heads to the intake manifold (its an emissions thing).

How to remove intake manifold gasket on Silverado truck?

Remove the throttle body and air tube. On the newer trucks, there’s no coolant lines running through the throttle body and the throttle position is all-electric, no manual cables. Gas line comes off easily, you can relieve the pressure on the passenger side valve first (just remove the cap and push in).

Are there any gaskets on my intake manifold that pop?

There was no obvious deterioration of the gaskets. The earlier ones were red and ethanol ate them. The newer factory gaskets are green and will hold-up to ethanol. They pop right off. Inspecting the manifold, the entire inside was coated lightly in thick oil and carbon.

Can you clean the intake manifold of a GM V8?

Fuel additives and cleaners will clean from the heads-down, you can clean the throttle body, but you won’t be able to get everything out of the manifold itself. This is at 85k miles, and any other GM V8 is going to be the same deal (worse if you have not been running a catch can since very early).

Re: Oil in the Intake Manifold. It is normal for there to be some oil in your intake manifold due to the PCV valve. This allows pressure to be released from the top of your heads to the intake manifold (its an emissions thing).

Remove the throttle body and air tube. On the newer trucks, there’s no coolant lines running through the throttle body and the throttle position is all-electric, no manual cables. Gas line comes off easily, you can relieve the pressure on the passenger side valve first (just remove the cap and push in).

There was no obvious deterioration of the gaskets. The earlier ones were red and ethanol ate them. The newer factory gaskets are green and will hold-up to ethanol. They pop right off. Inspecting the manifold, the entire inside was coated lightly in thick oil and carbon.

Fuel additives and cleaners will clean from the heads-down, you can clean the throttle body, but you won’t be able to get everything out of the manifold itself. This is at 85k miles, and any other GM V8 is going to be the same deal (worse if you have not been running a catch can since very early).