RightSaid fred

High crankcase pressure .........99% of the time it's broken pistons.
I would have thought someone would have figured it out after 96 pages of BS.


Pull out the sparkplugs.

Take a good look at the threads.


The ones wet with oil, they're the ones with the broken piston.


Easy fix.......pull the head, drop the sump, pull the piston and rod.
Replace with a good used one,.......fixed.


It's a pretty much "normal" condition for any turbo engine that's been badly tuned with too much knock.


Seen it lots and lots and lots of times.
Fixed it lots and lots and lots of times.


A compression test nearly always returns normal numbers as does a leakdown test.

A leakdown test should be done with the piston half way down the bore after firing.
That's because after driving (a long time) with broken pistons you get a groove worn in the bore. That's due to the rings no longer able to rotate on the pistons.
There's no groove worn in the bore at the top so it seals OK, there's also no groove at the bottom of the bore so it seals OK....but leaks half way down.


There you go.....think on that for a while?













But I can't have broken it, it's just not possible.
My tuner said so.

mrfred

iTrader: (50)

Are you using the factory or aftermarket check valve? Aftermarket valves often have much too high of a flow rate to be correctable by closing down the BISS. If you want to use the IM for PCV and get the benefit of using the PCV passage on the valve cover to reduce crankcase pressure, then the arrangement in my drawing below is needed.

LetsGetThisDone

iTrader: (1)

Mychailo, my car handles a 6an PCV line to the manifold. Took some turning down of the ISCV settings, and the BISS is only about 1/4 or 1/2 turn out, but it idles nicely at 1050-1100 with the GSC S2's.

RazorLab

iTrader: (8)

I think we should all agree to just ignore WrongSaidFred from now on. Broken pistons, lol.

mrfred

iTrader: (50)

Yep, I'm sure that a BISS adjust will get the job done with some setups. What check valve are you using? While I didn't mention it in my prior post, the layout that I show allows for maximum benefit of using the PCV port on the VC to provide crankcase pressure relief while allowing idle to function normally.

LetsGetThisDone

iTrader: (1)

A large one from McMaster Carr. I was running all 10an lines, which proved not controllable. So, I replaced one section with 6an. Fixed.

Ian0611

iTrader: (41)

I was thinking the exact same thing. I thought about responding but I decided it wasn't worth mine, or anyone else's time.

Ian0611

iTrader: (41)

Thanks Mychailo! I'll definitely keep this routing in mind. I already have the BISS turned down most of the way, so I'm thinking it definitely needs the PCV valve put back in along with some other tweaks perhaps. I'm planning on working on it tomorrow so I'll let you know if I manage to get things corrected and what I end up with.

mines5

fuel pressure fred on the ignore list lol

RightSaid fred

https://www.evolutionm.net/forums/ev...ed-advice.html


lol

Ian0611

iTrader: (41)

Well it looks like I got at least half of my problem solved over the weekend. On Saturday, I put a PCV valve in-line with the check running from the catch can to the intake manifold and that solved the high idle problem. I need to put some miles on it now to make sure it's no longer pushing oil past the turbo seals, but I'm hopeful that issue is solved now as well because before it used to smoke a little at idle and it doesn't appear to be doing that anymore.

P.S. I wish I could do cool diagrams like MRFred Lol!

seven10

iTrader: (14)

Ok, so I installed -10an lines running off my valve cover to the sealed STM catch can and ran a -10an line back to the intake. I've been driving on this setup for the past week, but I'm still getting oil in the intake. I know this is fresh oil too since I changed to Penngrade 1 when I put all this stuff in and the oil pooling is green.

I'm kind of beyond frustrated with this FP Red at this point. Anything else I should be checking before I pull the turbo and ship it to FP or get so mad I throw it off my parking garage?

LetsGetThisDone

iTrader: (1)

Did you run a line back to the intake manifold with a check valve?

seven10

iTrader: (14)

Yep, running a -6an line off the can to a check valve and then from that into the intake manifold.

LetsGetThisDone

iTrader: (1)

Only thing really left to do is check crank case pressure, or call FP.