Mazda Rotary Club

General => General Technical => Topic started by: tokyo_black on September 16, 2006, 10:50:46 AM

Title: Blue Smoke off load
Post by: tokyo_black on September 16, 2006, 10:50:46 AM
Hey guys,

I have some puffs of blue smoke coming from my exhaust after I boot it, does anybody know what to check to try and diagnose it?

I have quite a lefty oil leak and there is a possibility that oil is seeping onto the exhaust and getting burn\'t off - but if that was happening why would it only smoke when i boot it?

On idle it\'s fine. Water is fine.

Any thoughts?:confused:
Title: Blue Smoke off load
Post by: Prof on September 16, 2006, 11:50:33 AM
1) oil seals in turbo going?
2) metering oil pump feeding in too much oil?
3) signs of failure in engine seals?
Title: Blue Smoke off load
Post by: Grizzly on September 16, 2006, 12:53:43 PM
If its mainly on Over run have a closer look at the Turbo.

If it was Oil control rings it would do it all the time and my T2 had a problem with its OMP sticking open and that would smoke lots on idle.

Are you getting oil out of the Blow off Valve? and is there oil in the Boost pipes?
Title: Blue Smoke off load
Post by: Prof on September 16, 2006, 01:09:45 PM
I am,  and no smoking on idle - plus oil consumption is very high - I think defo the turbo for me - sounds like your\'s is the same tokyo.
Title: Blue Smoke off load
Post by: tokyo_black on September 16, 2006, 01:52:28 PM
okay thanks guys i will check these points
Title: Blue Smoke off load
Post by: FD3UK on September 16, 2006, 02:03:08 PM
Smoke in exhaust can also be caused by to much oil being fed to turbo and pushing past bushes on overrun when there is no boost and lots of vacuum.

You may need a restrictor in the oil feed pipe.
Title: Blue Smoke off load
Post by: tokyo_black on September 16, 2006, 03:09:29 PM
Hmm ok, but how do I tell if i need a restrictor?
Title: Blue Smoke off load
Post by: MillSpeed on September 16, 2006, 03:58:22 PM
Are you running any additional fuelling? The stock set up is pretty sooty, could just be unburned fuel getting chucked out the exhaust on overrun. Does it look like oil smoke?
Title: Blue Smoke off load
Post by: tokyo_black on September 17, 2006, 10:49:13 AM
It is a single turbo with bigger injectors and apexi ecu - (im guessing thats not standard fueling??-im not very mechanically minded :Hammer)
Title: Blue Smoke off load
Post by: vxer on September 19, 2006, 10:33:50 AM
Isn\'t blue smoke petrol burning? I thought oil smoke was white?

Could just be running very rich, maybe?

Ta, Paul.
Title: Blue Smoke off load
Post by: Prof on September 19, 2006, 11:06:02 AM
Petrol - no colour - shouldn\'t be any smoke

Water / Coolant - White/Grey smoke

Oil - Blue/Grey

Massive lack of oxygen and hydrocarbons not burnt - Black Smoke - sometimes accompanied by a flame !
Title: Blue Smoke off load
Post by: tokyo_black on September 19, 2006, 12:40:59 PM
Oooh we are learning :D

I\'m going to try and check my boost pipes for oil contamination this weekend.. now I just need to figure out which are my boost pipes...

If I post up an engine bay shot could anyone annotate it for me? :Typing
Title: Blue Smoke off load
Post by: tokyo_black on September 19, 2006, 01:53:41 PM
Could anyone highlight which are the boost pipes on this pic that i can check for oil contamination?

(http://www.tokyotrader.co.uk/13b.jpg)


Thanks guys:cheers
Title: Blue Smoke off load
Post by: Joeh on September 19, 2006, 05:01:27 PM
the same line as the mushroom filter is on, I would suspect to find oil deposits deeper in after the turbo rahter then the line between the filter and the turbo... o_o I believe so anyway
Title: Blue Smoke off load
Post by: Grizzly on September 19, 2006, 05:59:42 PM
Ither of the two on the Intercooler (in is best though which is the drivers side one) of the two blue hoses fastened to the Turbo the one without the air filter on the end :)
Title: Blue Smoke off load
Post by: tokyo_black on September 19, 2006, 09:19:55 PM
Ah now I understand!

Thanks guys :D
Title: Blue Smoke off load
Post by: tokyo_black on September 23, 2006, 12:40:40 PM
Right I have checked the turbo, hot pipes, cold pipes and blow off valve.
 
All of which are dry without a trace of oil.
 
Can anyone point me as to what I should check next?