Background:
2001 Mitsubishi Lancer Evolution 7 GSR Japanese Import.
155,000 km's on the clock.
Melbourne, Australia.
Last thread on issue: Summary of issues til now:
1. Heard a bang sound while wasting car (Not running). After driving it, it had the check engine light on and lost power at 50% engine load and greater..
2. Thought it might be a faulty MAF sensor, but couldn't get a hold of a working one to trouble shoot before spending $500 to get a new one.
3. After writing the Thread above and getting advise, I stated checking for boost leak. I found 2 leaks and fixed them.

Current Problem:

After fixing the Boost Leaks, I checked the pressure again. The pressure was taking/inserted from where I removed the MAF. I found another Leak which gives me more concerns.

I found pressure in the Rocker Cover when I opened the Oil-refill Cap. I had this pressure when I first got the Check Engine Light problem, but after checking different model performance cars, most had the same. So I ruled it out as a cause of the issue and put it down to normal engine age or PCV valves. I prayed it wasn't blow-by.

When I did the boost leak test, I found the pressure again... THIS REALLY CONFUSED ME!!! how did pressure from the intercooler, turbo, intake and combustion chamber get into the rocker cover??????????

Additional Questions:

Is the PCV valve system connected to the other systems I pressurised.?

Could the PCV valve system be at fault? (is the 1-way valve broken and letting pressure in)

Is it a deeper issue with internals and/or gaskets? (I.e. bent valves, blown gasket, etc)

 

Bumping for HELP!!!

 

Sounds like you are doing a boost leak test on the intake where the Maf sensor bolts up, if so there is a crankcase vent line going from the intake to the rocker cover, this is why your pressurizing the crankcase, that or your pcv valve icould be bad.

 

Correct, I was doing a Boost leak test on the intake from where the MAF sensor bolts up..

Thank you for your help, I havn't started the engine since testing and finding the crankcase pressure..

Can anyone point in the right direction of a PCV valve that fits my Evo 7 JDM.. I found that there is a difference in valves between the US and JDM models, but I cannot find where to purchase or source it...
any links would be nice

Thank you!

 

Contact Russell at Mitsubishi Parts, He can get you taken care of.