AOS?

[Sputter]

I changed my oil a couple days ago. While the car was running I removed the oil cap, I noticed a drop in idle and a slight suction with my hand covering the filler neck. It wasn't strong, not even enough to notice it while taking off the cap.

I'm just curious if this is a normal vaccum or a heads-up to a failing AOS.

Thanks, Jim

[1schoir]

I changed my oil a couple days ago. While the car was running I removed the oil cap, I noticed a drop in idle and a slight suction with my hand covering the filler neck. It wasn't strong, not even enough to notice it while taking off the cap.

I'm just curious if this is a normal vaccum or a heads-up to a failing AOS.

Thanks, Jim

Jim:

If the AOS is on its way out, it usually becomes very difficult to take of the oil filler cap. The negative pressure is substantial.

If you are concerned about your AOS (due to mileage, etc.) why not remove the air tube at the throttle body and inspect for excessive oil deposits?

Regards, Maurice.

[Sputter]

I changed my oil a couple days ago. While the car was running I removed the oil cap, I noticed a drop in idle and a slight suction with my hand covering the filler neck. It wasn't strong, not even enough to notice it while taking off the cap.

I'm just curious if this is a normal vaccum or a heads-up to a failing AOS.

Thanks, Jim

Jim:

If the AOS is on its way out, it usually becomes very difficult to take of the oil filler cap. The negative pressure is substantial.

If you are concerned about your AOS (due to mileage, etc.) why not remove the air tube at the throttle body and inspect for excessive oil deposits?

Regards, Maurice.

Maurice,

That's what I thought, but I'd never taken the cap off while the car was running before so I was curious. Mid summer I had removed the TB just to see its condition. It was slightly dirty but no more than I expected at 45k.

Thanks for the tip.

Jim