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Blue Smoke

Botters

By Botters,
in Engines & Forced Induction

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PSI_GTSII Experienced

PSI_GTSII

Posted
Posted

Normally its the Valve stem seals that are stuffed when you start the car and it blows blue smoke.

If the seal is stuffed around the valve then overnight or over a period of time oil leaks down on top of the Piston creating a nice pool of oil for the morning when you start it up hence the puff of blue smoke.

However the oil leak is not enough to notice once that initial oil has burnt, and you wont notice any blue smoke when you drive.....until you leave it turned off for a long enough period and the oil builds up again.

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PSI_GTSII Experienced

PSI_GTSII

Posted
Posted

If it is your valve stem seals this would be the cheapest fix of all the Oil burning related engine problems >_<

The valve stem seals themselves are only a few dollars, but its still fairly time consuming removing and replacing them all.

Best Guess $400.....?

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ToF Experienced

ToF

Posted
Posted
Normally its the Valve stem seals that are stuffed when you start the car and it blows blue smoke.

If the seal is stuffed around the valve then overnight or over a period of time oil leaks down on top of the Piston creating a nice pool of oil for the morning when you start it up hence the puff of blue smoke.

However the oil leak is not enough to notice once that initial oil has burnt, and you wont notice any blue smoke when you drive.....until you leave it turned off for a long enough period and the oil builds up again.

Interesting you say that and it makes sense.

I *think* my RB20 is reasonably healthy given it's still running and nothings changed while I've been giving it a hard time. >_< But I do remember not using it for about a month or so a while back and when I went to start it and this huge puff of blue smoke came out on start up. But since then I have yet to see a mist of blue smoke, I'll assume it's because I drive it at more regular intervals now.

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sinistaGTR Grand Master

sinistaGTR

Posted
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hey pull your spark plugs out have a look and see if there is any oil on top of the piston (screwdriver and a rag), or get yaself a compression tester from super cheap there like 30 bucks (or get your mech to do it if your unsure) and check the compression.

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MerlinTheHapyPig Mentor

MerlinTheHapyPig

Posted
Posted

do a compression test. This is the easiest way of determining what's wrong.

If it's lower than 120psi or if it's very low in one cylinder, put about 10ml of oil in each cylinder and do the test again.

-if the compression is good (all above 120psi and no more than 15psi variation between cylinders) then i'd say it's the turbo seals

-if the compression rises on the second test it's definantly rings or pistons

-if the compression doesn't rise on the second test, then it's valve related (or could also be the head gasket), i'd say stem seals most likely.

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Botters Enthusiast

Botters

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Guys i started the car this morning, so its been sitting there the same amount of time last night if not longer. And there wasnt a trace of blue smoke on start up, but just a bit of blackish smoke when i got my g/f to rev it up a bit

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