I have a 98 B18C5 that smokes (black) at high RPM's and leaves a residue. Black means running rich so I checked a couple of things and found out that the thermostat was bad and the car was running too cold and it took too long to warm up. So i fixed that, changed the fuel filter and did the timing belt and water pump. The engine feels a lot better but I'm still getting some smoke. What else could be causing this problem?
Thanx

 

rings?

 

Comp is fine and wouldn't it be blue smoke if it was bad oil rings/seals?

 

maybe something like bad valve seals. something like a cup seal that wraps about the bottom of the valves.

 

Reset the ECU if you haven't already. Also check the coolant temp sensor.

 

Good one. THX

 

Are you running any form of engine management?

 

Nope. Everything's stock.

 

Guessing the car is white?

If so, get used to it.

 

It's possible that the valve seals are worn. Did you you use a oil squirter after the initial compression test and then recheck the compression? Dramatic (about 15% or more) increase in compression is usually a sign of worn rings. If there is no increase at all, then your valve stem seals are probably bad.