99 chevy 2.2 has smoke coming out of valve cover hose, filling up the air housing with oil


Asked by Nov 02, 2014 at 12:56 PM about the 1999 Chevrolet S-10 2 Dr STD Standard Cab LB

Question type: Maintenance & Repair

The oil filler has no blowby, runs OK, but there's pressure and smoke coming out of the
tube on top of valve cover, Does this have a PCV ? Or should i say does it have a
serviceable PCV & is that the problem? Thanks for all the info guy's

11 Answers

The PCV pulls air from crankcase from intake manifold vacuum, through PCV valve, and re-enters from a clean source, usually the air filter. If your crankcase is pressurized, with air/smoke coming OUT, something is very wrong. Probably blow-by from piston rings. The PCV valve function is to keep the flow in one direction,

1 of 1 people found this helpful.

.Generic system..I forgot a word on the end..keep flow flowing out ..This will get bigger to see

1 of 1 people found this helpful.
Best Answer Mark helpful

Why wouldnt I have the same at the filler tube/dipstk? and what causes this ?


Thanks FordNut, the diagram explains alot except that the PCV valve is inside the valve cover, can I service & do you think it would help? Thanks

Now that's a good question, that I don't have an answer for. If the crankcase really is pressurized, it would be coming from both oil filler cap (unless it's a sealed type), it may not be like the image, and draws in from the filler with steel-wool as a filter. And the dipstick. That is a mystery to me...and the only way I know that a crankcase can get pressurized is a head gasket or ring blow-by. My answer is very generic, GM not my specialty....hopefully somebody will see this thread and add to or flat correct me.

1 of 1 people found this helpful.

A new PCV valve is under $5 and very easy to replace, sure wouldn't hurt to try a new one

1 of 1 people found this helpful.

Whoa, have a look at this thread.. http://www.s10forum.com/forum/f105/2001-s10-breather-hose-from-valve-cvr-to-int-428315/

3 of 3 people found this helpful.

http://www.s10forum.com/forum/f105/2-2-pcv-valve-478564/ .now those guys, say GM did away with the valve in 1999. IDK what's going on... what I do know for absolutely certain is must be ventilated somehow

1 of 1 people found this helpful.

WOW!!, Now im at a loss, if this is the case im in trouble cause the air is smoke and lots of oil in there, cant be good for the cyls, this isn't s 2 stroke, Is it !!? There's supposed to be a PCV valve of sorts inside the valve cover built in to the top side, the length of the cover. not sure if its serviceable, any ideas ? Thanks for all the help, this place is great !!

1 of 1 people found this helpful.

I think I may have stepped in to something over my here man..but here are a couple more suggestions (NO, not a 2-stroke, no way) anyway. http://www.justanswer.com/chevy/3a1si-oil-coming-breather-oil-pressure-dropping.html and.. http://www.answers.com/Q/Does_a_Chevrolet_S10_pickup_have_a_pcv_valve_for_a_4_cylinder

1 of 1 people found this helpful.

We do our best..but ask me about a Ford or Toyota next time..eh? LOL

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