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Rb26 Misfiring On Boost

Turbz_13

By Turbz_13,
in Engines & Forced Induction

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DVS JEZ Grand Master

DVS JEZ

Posted
Posted

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)

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Nee-san Grand Master

Nee-san

Posted
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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 Grand Master

DVS JEZ

Posted
Posted

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 Grand Master

Nee-san

Posted
Posted

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 Grand Master

Nee-san

Posted
Posted

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.

demo.jpg

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 Grand Master

SiR_RB

Posted
Posted

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

DVS JEZ Grand Master

DVS JEZ

Posted
Posted

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.

  • 2 weeks later...
Nee-san Grand Master

Nee-san

Posted
Posted

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...

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