st1llet0

iTrader: (2)

So what I've been experiencing is a lot of smoke after letting off the throttle at high rpms. No smoke during the acceleration, I can take it all the way to redline with only a little bit of fuel smoke (the afr bottomed out at 10.0 after 6k) but as soon as I let off there is a huge, and I mean huge cloud of blue oil smoke.

This, of course, worried me. So I started some troubleshooting.

I wasn't thinking it was oil control rings, my oil pressure is high (60 at idle, a little less than 110 at 3k rpm) and the last engine I drove had bad oil control rings, and smoked durin accel badly. So I looked into other oil sources.

I noticed that while idling I could see some bubbles in the omp lines creeping slowly towards the engine, if I give it any throttle the bubbles move fairly rapidly in the other direction for a little bit, then back towards the engine, as soon as I let off the throttle, as the engine is slowing down, the bubbles move very quickly towards the engine.

Ok, so it looks like this is where I'm getting so much oil. So to kind of test my theory, I put a known working omp on, and am still getting the exact same results.

Is there some sort of check valve in the oil injectors that could be bad, causing the oil to flow in the opposite direction?

And is the oil supposed to be pulled freely like that, or should the pump be limiting the amount of oil injected?

I plan on blocking off the omp and running premix (I already run a light mixture because I'm paranoid) but for the time being, I'd like to know the Mazda approved way of solving this problem.

Any suggestions guys?

scrip7

iTrader: (6)

When checking the oil injectors, the FSM states that when blowing air into the inlet of each injector, air should flow in one direction only. Should not be able to suck air through it. I have found many oil injectors failing this test over the years.

st1llet0

iTrader: (2)

Cool, that would explain my back flow, I'll have to take a look at that this weekend, I have a dozen oil injectors laying around, bound to find a good set in there.

What about the pulling back in though? That's whats causing the smoking, and I can't think of what would stop it from pulling oil in, unless there is a failed valve or gasket in the omp that is letting oil by without, well, metering.

scrip7

iTrader: (6)

Is your car NA or Turbo? s4 or s5???

High oil pressure shouldn't make much difference when it comes to the oil control rings. They aren't subject to direct oil pressure. The oil is sprayed into the rotor cavity by the jets on the e-shaft. There are numerous reasons for oil consumption, so it may take several steps to get your problem solved. We need to determine if your crankcase is being vented properly to start with. If not vented properly, it can become pressurized and force oil to be burned in the chamber. Remove your dipstick temporarily and see if the smoking subsides and report back.

EDIT:

Just saw your sig which shows s5 NA. When you deleted emissions did you cap off the vacuum port on the oil filler tube? I recommend keeping the purge control valve.

st1llet0

iTrader: (2)

I didn't cap the nipple on the oil fill tube, I thought it was supposed to breath a little. And yes, I have no purge control valve. I'll have results of the dipstick test (lol) tomorrow.

scrip7

iTrader: (6)

If the port isn't capped off then the dipstick test isn't necessary. Your increased oil pressure is likely allowing more oil to the oil injectors. You might pull the plugs after a high rpm decel to see if one rotor is getting more oil than the other, and then remove the oil injectors to see if any of them fail the test I mentioned above.