If you're on the original PCV valve, it needs changing... replace it with a factory part.

I'm at 186k without smoking (have a new Mopar PCV valve)... I add a half quart about every 5-6 weeks, and drain a couple of ounces a week from the catch-can I have installed... so the PCV line is where the majority of the oil goes, even with a good PCV valve.

 

Do a compression test, dry, then wet. See what the numbers do. Leak down test wouldn't hurt either.

 

This may be dumb but I've never done a compression test. What do you mean dry than wet?

 

Take out all the spark plugs. Unplug the electrical connector from the coil. (either that, or just pull the ASD relay, that will disable the fuel injectors too. Actually, that's probably the best way to go.)

You can rent a compression gauge from the local parts store.

Screw the gauge into cylinder #1. Crank the engine five or six times. (you will hear it hit the cylinder that you are testing.) Write down the reading. Release pressure on the guage, move on to the next cylinder.

Test the cylinders in whatever order you want, just make sure you note what each cylinders numbers were..... (so, test in numerical order, or, go down one side, then the other, whatever. Just so long as you know what each cylinder managed for compression.)

When you have gone thru all eight...... Use a syringe, or something similar, to squirt an ounce of two of oil into a cylinder, then run the test again, adding oil to the cylinder right before you test it. Note the numbers for the second round of testing as well.

Chrysler says 100 pounds is minimum spec, and all cylinders should be within 10% of each other. So, if you have one at 100, and one at 150, that's a fail. If the numbers jump pretty significantly on one or more cylinders on the wet test, that tells you the rings are bad. If you have two cylinders next to each other, that are lower than the rest..... that tells you you have a head gasket problem.

It's amazing what one simple test can tell ya.

 

Cool. Thank you

 

Usually it happens slowly not over night. Did you do the Hughes kit or just replace the stock one? How long did you drive/run it since the plenum replacement? You could disconnect the pvc from the intake to rule that out. You may want to take it for a long ride to burn off any oil residue in the exhaust(if any).

 

I'm gunna try tonight running it longer and running some more seafoam through it. I had the PCV disconnected at one point. Hughes kit btw

 

Replace the PCV valve as well. Get one from the dealer.

 

Yea I planned on a new PCV since this ones at least 6 years old anyways

 

Dry test
Cylinder 1 : 150
Cylinder 3 : 150
Cylinder 5 : 150
Cylinder 7 : 150
Cylinder 2 : 135
Cylinder 4 : 150
Cylinder 6 : 90
Cylinder 8 : 90
Gunna buy my own compression checker to recheck and run a wet test
Tester I borrowed had bad o rings so it wouldn't hold the pressure and I don't think it sealed properly on 6 and 8