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Thick white smoke and oil inside my throttle body

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Old 09-14-2018, 03:41 AM
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Thick white smoke and oil inside my throttle body

Hi Everyone
I am new to this site and i have bought a RX 8 about 6 months ago and had the engine rebuilt everything was working perfectly until 3 weeks ago .
I just started up the rx and went to town wich is 50 km from where i stay ,when the cars temp was right i felt the need for speed and on the first gear after i reached 6 000 rpm it felt like the car was loosing power and a thick cloud of white smoke came out i could Bearley see behind me ..
Since i was already half way to town i continued my way there under 6000 rpm then the car runs fine .. when i got back home i took out the airfilter housing and found lots of oil inside the tube and throttle body now im not sure I've not been driving around with my rx8 since then .. if anybody can give me some advice it would be appreciated. .
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Old 09-14-2018, 06:59 AM
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This can happen if the oil was overfilled, or if there is excessive blowby pressure. The first is easy to check. The second.. I would pose questions to whoever rebuilt your engine.
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Old 09-20-2018, 06:36 AM
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Okey so i cleaned out the intake tube

Okey guys so i cleaned out the oil on the intake tube and removed the intake manifold plastic part and cleaned it out .. my oil dip stick shows that the oil is only half way so how do i prevent this issue ??
And how do i reset the throttle body ?
I was stuipid not to make sure if i can just press it open and clean it out now i see that if i pressed it ipen with my hand i have to reset it but how ?
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Old 09-20-2018, 08:15 AM
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If your oil is half full, then the reason this is happening is someone botched the rebuild. That oil is pushed up by blowby pressure. Higher rpm=more pressure. You can manage it by not revving high or at full throttle, but the root cause is a poor rebuild. Can you share how it was rebuilt, if parts were reused, etc?

Not sure about resetting the throttle body.. itsi supposed to calibrate itself when you turn the car on. Maybe turn the key to on but not start the car and see if it resets?
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Old 09-20-2018, 08:39 AM
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Okey then i think it might be the rebuild ..
When i am driving normaly (wich is not fun knowing im in my red beast) there is no smoke .. but as soon as i go over 6 000 rpm she smokes like crazy !

I bought the car with a broke down engin took it out and sent it to a company who knows more about rotory than i do since i am just a normal mechanic working on normal cars ,i felt like it would be the better option .. so they called me after the got the engin open and told me that the are unable to repair my engin but the do have a few older engins (all 13B) and can assemble one out of 2 . After the were done they said its all 100 % i can just build in the engin and get going .. but i should not be hard on her for about 1000 km because the engin is rebuilt and all the apex seals and everything has to run in .. and gave me a tip stating that 200 ml of 2stroke oil will make the engin last longer on every full tank ? .
I did everthing they said and now after 6 month she is sick ..

Is there anyway i can fix the blowby without sending the engin back there ?
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Old 09-20-2018, 09:01 AM
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You could try performing a rotary comprerotary test to confirm the diagnosis. If they built one engine out of 2, they may have reused parts that were worn out of spec. If they only have 2 engines sitting around, you better hope they have enough in-spec partsbetween them. Reputable rebuilders have many of these sitting around and take care to find reusable parts, rather than the most reusable ones they have access to at the moment.

And also did this rebuild come with warranty?
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Old 09-20-2018, 09:53 AM
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Definitely perform a rotary compression test. Any Mazda dealer should be able to do it. Rotary specialists should have the appropriate testing tool as well.
Don't settle for a piston engine compression tester.
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Old 09-20-2018, 01:26 PM
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Fixed.
Originally Posted by H.B.Lewis View Post
Hi everyone. I am new to this site. I bought an RX-8 about 6 months ago, had the engine rebuilt, and everything was working perfectly until 3 weeks ago.
I just started up the RX-8 and went to town, which is 50 km from where I stay. When the carís temp was right I felt the need for speed, and in first gear, after I reached 6,000 rpm, it felt like the car was loosing power, and a thick cloud of white smoke came out; I could barely see behind me. Since I was already halfway to town, I continued on my way there, under 6,000 rpm, and the car ran fine. When i got back home, I took out the air filter housing and found lots of oil inside the tube and throttle body, and I havenít driven my RX-8 since then. If anybody can give me some advice, it would be appreciated.

Last edited by New Yorker; 09-20-2018 at 01:29 PM.
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