crankcase pressure

[DSMChase]

So I just rebuilt my motor, I've put 300 miles on it now, it runs great, but I do have a CEL, and there is oil leaking from my oil cap and turbo oil return. The car does not smoke at all, idles good, I have noticed that my oil smells like gas a little, is this normal? took my PCV off and blew through it and sucked, seems to be working, my rings were a little loose on #3 cylinder because I had the machine shop hone my cylinders to remove scratches, also getting a small weird knock when it is cold, goes away in about 30 seconds, and does not increase with rpm, could this be piston slap in that cylinder? Is it ok? Pistons are OEM std bore. Also, a bit off topic, I have a narrow-band A/F and it seems to be working normal, till about 20 miles when it starts reading leaner and leaner until it gets stuck at the leanest LED, could this be a bad O2? Causing CEL? Causing rich/gas in oil? gas in oil causing knock at cold idle? Recommendations?

Update: Cut apart oil filter (200 miles on it) found no shavings at all, not even dust, so ruled out bearing problem, I think, maybe my rings aren't seated yet?? I followed instructions that came with new rings on break-in. Possibly running rich and glazed my cylinders?? someone please help

 

[JusMX141]

You should have replaced the o2 sensor at the time the engine was rebuilt.

Going along with this- it's completely normal for the oil to smell like fuel a little until the engine is broken in as the cylinder blowby is much greater until the rings have seated.

 

[2slow4utsi]

You should have replaced the o2 sensor at the time the engine was rebuilt.

Going along with this- it's completely normal for the oil to smell like fuel a little until the engine is broken in as the cylinder blowby is much greater until the rings have seated.

Agreed. I'm not sure how long it takes to seat rings but I think it's less than 100. I've read that beating on the engine is actually good for seating rings as opposed to babying the car. Take what I'm saying with a grain of salt as I'm not an expert with the ring seating process of a DSM or any car for that matter.