PCV valve = oil burning?

Question

My 99 accord has been smoking bluish white smoke out of the exhaust only at high RPMS- 5000 and up, but NOT at lower RPMS. Obviously I rarely go that high, but I've feared the worst. I've checked the coolant, its green without contamination. today a mechanic discovered that someone installed the wrong pcv valve on the car- the one that belongs on the v6 model, and that it is somehow larger. the mechanic suggested it was possible that this was the cause of the smoke- the oil was getting into the intake manfold, and into the cat, and that when the engine is at higher rpms, and the gases/ heat increase, it burns up the oil in the manifold/cat. He said IF that is the cause it should clear up in a week or so. Does this sound to good to be true? or is it possible? the car does have 160,000 on it, but i've owned several hondas with much more mileage that didn't smoke at all.

Answer 1

The PCV valve is a possibility but the more probable cause on your car is that the spark plug tube seals are leaking oil. The 4 cylinder hondas have tubes that surround the spark plugs that run from the valve cover to the top of the cylinder head. There are gaskets on the valve cover to keep oil from getting into the tube from the top and seals at the bottom to keep oil from getting into the tubes from the bottom.

on older hondas the tubes fill up with oil and the oil works its way into the engine combustion chambers through the spark plug threads.

its real easy to see if this is the problem. Usually you can just pull each of the spark plug wires off. If the end of the spark plug wire is wet then you have leaking tube seals. Typically the seals on the valve cover can be replaced for about $50. if it requires the lower seals its pretty pricy.

I think that's what you're going to find. PCV failures are rare as are valve seal leaks or internal engine wear problems on hondas.

hope that helps

hope that helps

Answer 2

Maybe. What wt oil do you use?5w30 or 10w40? 10w40 in a 160,000 engine might also be what ya need. If ya live in an area that stays fairly hot ya might even try 20w 50 or straight 30 wt

Answer 3

is it burning[smoking out the ex.] or the engine comp[on the ex? ] sorry to answ with ? A blow out pcv could suck raw oil into combustion but would probably cause rough performance . slobbering injector would dilute oil in cylinder, and would smoke especially on acell.

Answer 4

a stuck PCV valve will cause oil burning too.....so that is a good place to start.

Answer 5

could be the PVC or it could be "blow by" past the worn rings ... get a compression test done ... this will let you know each piston chambers state of health