Excessive suction

[Luis]

Hello everyone, and it's a great relief to be accepted on this great forum. I have a 2012 Equinox 2.4L. Two days ago, I carefully cleaned the intake manifold port and reassembled everything, and it seemed fine. But the next day, after driving for a few hours, I heard a suction sound, like a vacuum or something similar. I decided to remove the oil dipstick, and the sound disappeared. However, I then realized that the same sound was coming from the oil filler cap. When I disconnect the hose that runs from the valve cover to the intake manifold, there's a lot of suction. Because of this, I'm getting code P0171. Has anyone else experienced something like this? I've done some research, and I think it's the valve cover and the internal PCV system. But I need advice from someone with experience.

 

[Tico007]

When you say cleaned the intake manifold port did you do anything else to it like enlarge it?

 

[Luis]

When you say cleaned the intake manifold port did you do anything else to it like enlarge it?

I don't think so. I did it with a small screwdriver that fit right there in the hole, and then with cleaner and hair.

 

[Tico007]

Normal to have some amount of suction in the pcv tube that goes from the air box to the valve cover. Check that hose for a leak. The flexible rubber part that goes onto the valve cover can rip. But if there’s an unusual amount of suction, I suspect you made the hole for the PCV orifice too big.

 

[Luis]

Normal to have some amount of suction in the pcv tube that goes from the air box to the valve cover. Check that hose for a leak. The flexible rubber part that goes onto the valve cover can rip. But if there’s an unusual amount of suction, I suspect you made the hole for the PCV orifice too big

 

[Luis]

It's possible I enlarged it without realizing, but I didn't feel any resistance when cleaning it. I'll try putting some wire in to test it, and if it improves, I'll have no choice but to buy a new manifold. Thanks, I'll let you know how it goes soon.

 

[Tico007]

Does the oil fill cap have vacuum or is there air pushing out of it?

 

[Luis]

Does the oil fill cap have vacuum or is there air pushing out of it?

 

[Luis]

Has vacuum

 

[Luis]

Similarly, I repaired the oil dipstick tube and the hose that runs from the valve cover, but I just put a half-millimeter wire in it and sealed everything well and waited for it to heat up. I think it's fixed because the pressure in the MAF sensor decreased and now it's giving a normal reading. I'll wait for the glue to dry completely before testing it properly.