blow by , blow thru

[nicknorth11]

I have had issues with this in the past, but changed my pcv and it was fixed. Now, though, I am having problems with it again and my pcv is fine. My compression isn't the best, but the cylinders are around 180, 165, 155, 175. I know the 155 one is a bit low, but I'm pretty sure I've read that if the numbers are within 15% of eachother, the rings are probably fine, and they are right around 15%. Also, I have never had any smoking issues, which is a sign of rings.

So, does anyone have any advice for me, or any ideas to try?

Thanks in advance

 

[oldman]

Describe the problem .

 

[nicknorth11]

As the topic states, the problem is blow by. When doing a boost leak test, I'm a losing pressure from my dipstick and valve cover to intake pipe hose.

 

[oldman]

Then it's probably not blow by, more like turbo seal, pcv, valve seals and then maybe rings but not likely.

 

[nicknorth11]

Then it's probably not blow by, more like turbo seal, pcv, valve seals and then maybe rings but not likely.

I can eliminate 3 out of 4 of those, so valve seals perhaps. Thanks a lot oldman!

 

[nicknorth11]

I just did some reading about bad valve seals and they all mention blowing smoke. My car doesn't smoke at all and has had this problem for a long time. Are valve seals still a posibility?

 

[oldman]

Are you testing from the turbo inlet?

 

[nicknorth11]

Yes.

 

[bling5tatus]

I wouldn't eliminate any possibilities without knowing for an absolute fact, I don't care if the part was new yesterday, check it anyway because you never know. You know what assuming can lead to, I'm sure.

 

[oldman]

Yes.

Then move the tester to the TB elbow and see if problem persists, reason being it's normal to leak pressure into the crankcase through the turbo CHRA during a STATIC pressure test when there is no oil pressure in the CHRA.

 

[nicknorth11]

I also blow a LOT of oil out of the dipstick when boosting at 20 psi or higher.

 

[oldman]

I also blow a LOT of oil out of the dipstick when boosting at 20 psi or higher.

1. Repeat the compression test and immediately follow it up with a wet test, make sure the car is fully warmed up.

2. Is your crankcase ventilation properly re-routed? As in pcv to IM and breather to intake pipe?

 

[nicknorth11]

I did the compression test as you mentioned before, but I don't remember the results. I'll try to do it again soon.

The crankcase ventilation was properly routed until this morning, but I put a breather filter on my catch can and removed the hose connecting it to the intake pipe so it would breathe better and not cause me to lose 1/2 quart of oil, as it did last night.