Rb26 Misfiring On Boost

[DVS JEZ]

do a compression test, start on cylinders 6 and 5,

hopefully the engine is ok and if anything the turbo seals are leaking.

another thing to try is get an oil catch can but dont plumb it back in at air intake, only at the PCV,

mine started to blow small amounts of blue smoke due to a build up of oil in the cooler piping, cleaned this all out and setup my catch can to breath atmo (but it breaths near the air filter)

the way i see it is the high amount of vaccuum that the breathers normally get before the turbos actually suck the oil out of the head (too an extent)

[Nee-san]

yea thanks mate day off work tomorrow to find the problem, wish me luck !

[Nee-san]

Ok. Update, changed front turbo oil drain as was a little kinked and soft, although I check my oil daily it has gone from super high to low in the space of hours (must be surface elevation)

Slight pooling in the front of each turbo (small though)

Engine runs 100% beautifully, holds normal boost ~1 Bar

Blows blue smoke on high revs/boost conditions not alot.

checked the intake and drains, found a small amount of oil pooling on one of the bottom bolts of the rear turbo.

Filled car with oil

Took for a strap.

Notice large amounts of oil smoke and residue blown around near rear turbo (externally)

one of pod filters in front has been covered in a large amount of oil and this same oil has also been sprayed around at the front of the engine bay near BOV recirculation pipe (the stock little black metal ones)

Any thoughts ?

[DVS JEZ]

did you do a comp test to determine the condition of the engine? do this 1st and then if the engine is ok do the following.

take the rocker cover breather that goes to the turbo intake off and put it into a bottle or catch can, block the opening now at the turbo intake.

clean out all your intercooler pipes, and empty your intercooler of all the oil, you will see what i mean when you get it off.

then refit it all and try again.

but it sounds like you have blow by caused by possible ring land failure and my guess is that it will be cylinder 5 and 6

[Nee-san]

did you do a comp test to determine the condition of the engine? do this 1st and then if the engine is ok do the following.

Ok I will comp test the engine, but will that show stuffed oil rings ?

take the rocker cover breather that goes to the turbo intake off and put it into a bottle or catch can, block the opening now at the turbo intake.

clean out all your intercooler pipes, and empty your intercooler of all the oil, you will see what i mean when you get it off.

then refit it all and try again.

are the above two steps to see if my engine is breathing into my turbo intakes ?

but it sounds like you have blow by caused by possible ring land failure and my guess is that it will be cylinder 5 and 6

There is ALOT of oil at the front of the pod filters ATM and around the piping (external) and alot around the rear turbo itself (external)

[Nee-san]

did you do a comp test to determine the condition of the engine? do this 1st and then if the engine is ok do the following.

take the rocker cover breather that goes to the turbo intake off and put it into a bottle or catch can, block the opening now at the turbo intake.

clean out all your intercooler pipes, and empty your intercooler of all the oil, you will see what i mean when you get it off.

then refit it all and try again.

but it sounds like you have blow by caused by possible ring land failure and my guess is that it will be cylinder 5 and 6

Ok, Update.

I rerouted the pipe with the white arrow to a bottle (see through) with oil line and blocked off the end with the red hose.

Took the car for a strap, not one drop of oil was in the bottle when i was done and further there was none in the engine bay like before.

Comp test is being done on the weekend...

Any thoughts ?

[SiR_RB]

I just noticed a misfire problem today high in the rev range on low boost (14psi) and hi boost (18psi)

I changed my spark plugs yesterday to bcpr7es and I gapped them to about 0.9mm, might need to re gap them down abit to 0.8mm?

Would closing them 0.1mm make a difference??

Car was running fine with old plugs which were gapped to 0.8mm

[Nee-san]

Thought those came pregapped to 0.8mm

Anyway, check the usuals.

Piping for leaks

Coils and Coilpacks

ignitor

AFM's

[SiR_RB]

Nah they came with 1.1mm gap.

Il put em down to 0.8mm and see how I go

How exactly do you check your coils? I'm gonna put in a new coilpack loom in tomorow aswell cos mines all crispy lol

[DVS JEZ]

Michael, try the .8mm plug gap 1st, see if its still there.

Nee san, what you have done is removed the large vaccuum from the oil breathers which in my opinion is a good thing and helps keep all the cooler pipes etc clean, mine was doing exactly what yours was, thats why i recommended that mod to the breather system.

drive it around for a couple of days and see how it goes.

[Nee-san]

Ok mate, she is still blowing smoke but I will give it a day, comp testing it tommorow.

[DVS JEZ]

the smoke will be from the build up of oil in the cooler pipes, well if the motor is healthy. let us know how the comp test goes

[Nee-san]

Ok Update time:

Comp test came back fine with all between 145 and 155 except # 5 which was 160.

When trailing throttle, say through a corner or after a big hit of accelerator once I back off or change gears occasionally there is a HUGE plume of blue some that last only for a couple seconds.

I think the turbo Oil seals are f**ked...

[DVS JEZ]

Clean the cooler pipes out before u change the turbos. See if that helps. There will be a fair bit of oil in the cooler