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RX-7 3rd Gen Specific (1993-2002) RX-7 1993-2002 Discussion including performance modifications and Technical Support Sections.

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Old 10-02-2008, 06:15 PM   #1
Cp1
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Default Problem diagnosing "wheres the burning oil coming from?"

ok guys i need some advice.

a while ago i noticed that my car started to burn oil (Yes before any one questions, i know for a fact it is oil not anything else.) so i took it for a little drive with a passenger to try to offer the best description of when and how its doing it.

Also mods do not play a role so dont ask.

first heres the symptoms:

Burns oil on start up and continues on through past warmup.

when driving it appears to be gone altogether. unless it is still warming up.

once warmed and at idle it will continue to burn oil unless you push slightly on the throttle raising the rpms a little then it goes normal.

once it settles back down to idle it begins to burn again.

it almost appears to be intermittant. on and off but i notice it and i refuse to drive it while its like this.

Now i have had some thoughts about diagnosing this as i believe it to be one of two things: Oil seals inside the turbos are going/gone OR Oil control rings inside the motor are going/gone.

I have a spare set of known-to-be-blown twins here that ive thought about ripping the guts out of and filling all the oil/water holes with weld and blocking off the intake side of the bearings so as to allow me to start the car as NA. this would indicate that if the smoke goes away then it was the turbos and best just to replace them and if the smoke continues in the same fashion as before then i have narrowed it down to engine oil seals.

But before i begin another round of wrenching on my car does anyone else have some relevant advice or similar experiences that they can share?






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Old 10-03-2008, 12:23 PM   #2
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Do you still have your pcv valve? Sounds like a failing PCV valve or that you dont have it ventilated properly.

Smoke is usually seen on cold start due to high oil pressure, and when you left off the throttle after getting into boost because the engine is pulling so much vacuum.
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Old 10-03-2008, 06:20 PM   #3
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Check and make sure the pressure chamber is holding pressure. Pull a line you should hear a pop
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Old 10-04-2008, 11:12 AM   #4
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Both PCV and sequential system have been removed so neither can responsible for this.

No pressure chambers left.
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Old 10-07-2008, 09:23 AM   #5
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Well i started taking everything apart and all of my intake tubes are filled with oil. an overly excessive amount considering i dont have my crank case vented into my intake. so there is no possible way for oil to get in there except through the turbo bearings themselves. which could also mean they could be leaking into the exhaust side as well. ill pull the rest of it off tonight and see.
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Last edited by Cp1; 10-07-2008 at 09:25 AM..
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Old 10-14-2008, 01:05 AM   #6
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Well now... the bad news.

I got my test pipe set up and bolted on this weekend at marveled at how empty everything looks with a NA set up in a third gen.

but no sooner did i get it all back together and the fluids filled and fired up to realize my god its much louder than with the turbos on and oops forgot to take a little bit of gas out of my fuel maps so after the black smoke cleared the blue was back. let it idle up to temp and the oil burning seemed just as bad as before so i know its not the turbos although im pretty sure they were on the way out too as per my previous post so now i get to pull it out and check the oil control rings... YAY rebuild time. can you sense my enthusiasm?

well UPDATE engine is fine just fine and new turbos are all that are required.
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Last edited by Cp1; 10-31-2008 at 12:42 PM..
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