Oil Smoke on the downhill?

[Combat Chuck]

Edit: It should read "Oil Smoke Downhill" I can't type.

The Mule will intermittently smoke up some oil on steeper downhill, but only downhill, in low gear, and randomly, sometimes she does it, sometimes the exhaust is clean. I pulled the PCV valve, and it died right out, so there's no blockage causing pressure to force it into the carb from the breather. The Valves were done when Yodaman rebuilt the motor about last year.

She idles true, and passes smog, and I'm stumped, any ideas what will cause intermittent smoke?

 

[KLF]

I assume this is a 4-cyl 22R-series engine.

If it was "uphill" this typically indicates worn valve stem seals. Oil puddles in the valleys of the head and floods the tops of the valve stems, and engine vacuum pulls it down past the seals into the cylinder, where it gets burned.

I suppose it could also happen going downhill, although there is less tendancy for oil to puddle since it can pour over the "dam" in the front of the head and down the timing chain. Keep in mind that going downhill you will be decellerating the engine, under high vacuum, so more able to suck oil past the seals.

 

[Combat Chuck]

I was beginning to think it was the valves, too.
eh, oh well, I'd rather have an awesome truck that's got a few rough spots, than a car I hate and runs perfectly. Time to budget for the new valve stem seals.

 

[KLF]

Have you pulled a plug or 2 to see what they look like?

Might also do a leak-down test, make sure it's not a ring.

 

[toy4xfun]

i have to agree with KLF.

 

[Combat Chuck]

Reviving an old thread, here, with some new facts.

-The smoke is white, not blue, indicated that the "oil" I smell is likely residual.

-My brake master cylinder is dying, bleeding out from the inside, when I brake for a sustained period, the thing just sucks straight down to the floor.

This combined with the downhill white smoke means my brake fluid's draining into the manifold when I nose down.
no valve issues (at least to my knowledge), just some brake work. Honestly, she's a 27 year old truck, and I'm happy to replace parts that have by now earned the right to fail, as opposed to a seven year old truck that sheds vacuum lines and coolant hoses like there's no tomorrow *cough cough* dad's B3000 *cough cough*