scottydouk

iTrader: (3)

Did a track day, car never missed a beat, drove 50miles home all good, went out in car about an hour later and started smoking!?

Car is always warmed up and cooled down correctly.

Mainly notice it on over run and off boost, blue smoke.

No coolant or oil loss and correct levels, catch tank not full, oil changes every 1000miles, forged engine, metal head gaskets about 2 years old, all cylinders are 125psi compression checked, all 4 spark plugs not clogged and in good colour and condition, no oil at all in air intake and after turbo into inlet manifold, no play in turbine, with oil cap off and car running minimal gases escape through.

What do people think???

Turbo, valve seals, pistion rings etc?

Cheers

joz8968

iTrader: (13)

Blue smoke = burning oil, as you know. Is it defo emitting from the tailpipe?

If so, then you've answered your own question in your last sentence. Question is, which is it....?

budd

iTrader: (5)

turbo oil seals would be my chief suspect

stedee

iTrader: (4)

Mainly notice it on over run and off boost, blue smoke.

isnt that tell tale sign of turbo seals

if it smoked alot on start up especially mornings i would have said stem seals

check your ic pipes for excess oil

Claaarkio

iTrader: (1)

Isn't it that on overrun the vacum pressure changes and pulls the turbines towards the engine and if the seals are warm oil passes the seals and burns off producing blue smoke?

scottydouk

iTrader: (3)

Im going to go down turbo route i think, notice on gear changes and over run, on boost dont see any smoke!? As above its when the air pressures changes so thinkin turbo. No smoke on start up. Now doesnt boost above 14psi and will not at all? Usually runs and holds easy 20psi. Difficult how to explain, its like hitting some sort of limiter, but not boost cut as have programmable ecu and use EBC. Could this point to the turbo aswell?

joz8968

iTrader: (13)

After a run come to a stop and leave to idle for 5 mins. Then rev the engine -- any blue smoke will invariably mean the turbo's oil seals or thrust bearing are on the way out.

If blue smoke emits while idling (before doing the turbo test), then suspect piston rings or valve guides.

scottydouk

iTrader: (3)

Ok, if rings would of thought be down on compression but all 4 cylinders are good? If valve seals, this would cause lack of boost? Cars!!!!! Grrrrrr

joz8968

iTrader: (13)

Leaking valve seals would also mean down on compression of the offending cylinder/s too.

Does all sort of point to the turbo TBH -- the best scenario really!

scottydouk

iTrader: (3)

Removed turbo, when hold each end of turbine it has excessive end to end movemnt. Looks likes bearings have gone, can also slight scraping marks on inlet compressor housing. Suppose you get for what you pay for. Have now ordered one from Andy Forrest so cant wait to get it and have power again! Lol

sc_sjo

iTrader: (7)

Make sure you have no air leaks in the system - try and get your inlet tract pressure tested before ragging it after replacement. An over-speeding turbocharger can eat its bearings.

scottydouk

iTrader: (3)

New turbo fitted but still doesnt make more than 15psi boost!? How to get inlet tract pressure tested as above suggestion? Or would the actuator or spark plugs cause this?

scottydouk

iTrader: (3)

Cured!!!!!!!!

Well I never, a set of new spark plugs cured this fault!? To say the ones in car were new about 1000miles ago and were laser platinum PFR7B cant belive it.

But hey, cured now and at full power again!

joz8968

iTrader: (13)

99greenwagon will be over the moon about this result.

RS74

has it stopped smoking now to ?

scottydouk

iTrader: (3)

New turbo cured smoking and new plugs cured not being able to boost more that 15psi. Can only think oil burning from turbo seals/bearing failed contaminated spark plugs?