championadrien

iTrader: (29)

So recently my car has begun to smoke. This smoke has a blue tinge too it and does not smell like coolant type smoke.

After some research it looks like the most common problems associated with oil smoke is the turbos, oil control rings, oil injectors, and the PCV system.

A little background info on the car:

1993 Base Mazda RX7 - 135,000 miles
Engine: Not sure if rebuilt or not, but it probably has been considering the odometer
Turbos: BNR Stage 3 - Replaced March 2011
PCV: The little plastic valve is eliminated, the nipples on the manifold and the filler neck have been capped.
Oil Weight: 20w-50

- If I leave the car parked for more than an hour, I get a poof of smoke upon start-up that lasts for about 5 min or less (driving around).
- The car "seems" to be consuming more oil than usual - close to a quart every 1-2k miles.
- Smokes intermittently sometimes when letting off gas, sometimes when stepping on gas.
- After 5-10 min of regular driving, the smoke greatly reduces only occasionally occuring with letting off or getting on gas.
- Drove a good 10 seconds at 4000 RPM in 1st gear and it smoked a whole lot, but this was in the first 5 minutes of starting up, not sure if that makes a difference.
- There's always been a little bit of oil on the intercooler piping and intake tracts, ever since I've gotten the car.
- The smoking started gradually about two months ago, since then I've done two 700+ mile drives. After the long drives the car smoked just a little, but recently I let it set for a week and now its starting to smoke a whole lot more.

Now my question:

I've looked into the different ways to evaluate what the problem could be but it seems I have a mixture of problems so I was hoping I could recieve some guidance on what to look for and what my next move should be.

I'm going to inspect the intercooler piping for oil, and hopefully the oil injectors tonight, but does anyone know if my symptoms are pointing to a specific culprit?

Alex Rodriguez

iTrader: (137)

For turbos-On a cold engine remove your turbo oil feed line and route it to dump in your oil filler neck. Fire her up and see if the problem goes away.

On a cold engine for Oil control rings best bet would be remove your
Spark plugs and egi/fuel fuses and only crank it 2-3 seconds make sure you have a napkin on both housings. Inspect how much oil comes out. Then repeat on a new set of napkins. Do this 3 more tines. That will tell you right away. Upon first try you should have a bit of gunk come out. But it should decrease as you keep putting new napkins. If you get the same amount every time and it's alot. Oil control o- rings are worn out/cut/pinched/burnt/ etc.....

Other things you can check are your turbine hot side wheels , down pipe,
But first the obvious check intercooler for excessive oil. That would be the first thing I would check. Check operation of the oil injectors by gradually raising the rpms and seen how much of fluid travel goes up the oil injector lines. Should be very small