Hi, I've got a 1990 tt

Problem

Oil in plenum , throttle body's clean,

New pcv valves and side and rear hoses all with restrictors in

Two front hoses to cam covers no restrictors could this be my smoking issue smelly smoke intermittent

Also removed mongoose system, for sale on eBay , only done a couple of thousand miles, after noisy back boxes if any around

There are lots of causes for oil burning in the zed, pcvs as you know, the car will also suck oil up on hard turns because of the pcv pickups location. you could also be pulling il up from the turbos, if the front seal has failed fully or partially, valve stems, oil rings etc etc etc. Process of elimation im afraid, what colour is the smoke? and when how does it occur? those two things will help greatly in diagnosis.

Throttle body's are immaculate, pulled plenum and excessive oil in center inlets, front pcv hoses don't ave restrictors in for some reason. Think this could be the cause, Smoke is very temperamental but when it smoke it smokes, started first when at traffic lights on tickover, seems to go at full throttle,

The front pcvs that vent from the top cam covers do very little drinking of oil, inside they're extensively baffled, that's why Nissan only put in a washer type restrictor. So id say that's unlikely that's your problem. If your experiencing grey smoke after periods of prolonged idle and it clears at over say 2500 rpm, its quite possibly your turbo exhaust seal :( is the car decatted by any chance?

No, exhaust s standard apart from mongoose cat back, you think change turbos, everything else has been done , block heads ect,

So the cam covers has baffles in where the pipes connect at the front

I wouldnt say thats definatly it, uou still not even said what colour it is. Lots of variables as I said. But yes the top cam covers are baffled to stop that.

Mix of blue /grey white, very smelly thou and can be quite dense.

Theres a thread with a vid of mine when I had issues.

Also can just stop, and run clean even ticking over.

How do I get to the thread