Question about 1998 Chevrolet K1500

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My small block chevy is sucking oil into the carb through the pcv valve-any ideas?

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Change the pcv valve if you shake it and no rattle it is stuck and no good its on the left hand side on top of the valve cover check your valve cover for gasket leaks on it looks pcv valve a little like a car cigarette lighter it pulls straight out my small block chevy is sucking oil into the - wutxtye0rjd9d9ekmodqt1eoxkvn9hr9qjz1l3dabggyud7sdgr36czsrfxqenadhnijx9nfayi+sz1sug0aaaaasuvork5cyii=

Posted on Apr 22, 2009

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Uses a large amount of oil, but no smoke from the exhaust, or any where else, plugs oil up very quickly, could one of my carbs be over fueling, one failed recently

Hi Philp:
Great Toy you have. My project car is a '73 GT6 MKIII.
I'd suspect that your carb problem and the oil consumption are separate issues. If the plugs are oiled up it would be logical to conclude that oil is getting into the cylinders. One would expect smoke from the exhaust. Not seeing it doesn't decessarily mean it's not there. Are you getting a lot of oil or carbon from the tailpipe?
Oil can get into the cylinders a number of ways:
- Bad rings - usually does not foul all plugs equally. A compression test may indicate but not always reliable.
- Bad valve guides/seals - this lets oil enter the cylinder via the valve. Intake valve - burns oil, Exhaust valve - increased crankcase pressure, PCV directs oil into intake manifold or carb.
- PCV valve fouled - stuck open - oil sucked into intake manifold or carb. This is the only way I can see oil entering the engine through the carb.

These should give you some things to follow up on.
Hope it helps.

Sep 04, 2015 | 1973 Triumph Stag

1 Answer

I have oil blowing out of the filler tube when I remove the cap on my 2008 Chevy Colorado what could be the problem

It's most likely due to a clogged PCV valve or clogged/kinked PCV hose. I'll include a video showing PCV system operation.
I've seen this symptom many times on various engines, and the PCV valve was usually clogged/defective. A clogged PCV valve results in crankcase pressure build-up and fumes/oil exiting places on the engine that it shouldn't. A severely clogged PCV often makes oil leak/exit out of the dipstick, even with dipstick in place.
The good news is... if the PCV valve is clogged/defective, the "cure" is a very cheap fix. Usually less than $5.
PCV stands for Positive Crankcase Ventilation, btw.

But note that on some engines (those where the oil filler opening is directly above the rocker arms/valvetrain) it is normal to have a small amount of oil "spray" come out, as the rocker arms are dispersing oil thru their oil passage hole on top.

(Whenever posting vehicle questions, always please add the engine size/type. It helps in more accurate diagnosis.)
Also, please rate via the helpful button if you feel my answer helped you out. Also post back and let me know if this cured it.

Nov 04, 2014 | 2008 Chevrolet Colorado

1 Answer

Why do I have no ventilation in my crank case on my chevy truck

That is what the PCV system is supposed to do. Positive Crankcase Ventilation. The pcv valve (maybe on the valve cover) sucks the fumes out into the intake manifold by a vacuum hose. There is also a fresh air hose to the valve cover from the air breather. As the fumes are sucked out, fresh air is supplied in.
You need to check the pcv system.

Apr 27, 2014 | Cars & Trucks

1 Answer

Gmc savana 2002 has lot air front oil cap

the PCV valve may be fine but what about the hose . It cab ne blocked up . Is the PCV valve connected up right . It is a one way valve and opens under vacuum ( when the engine is overrunning the throttle ). The extra air from the filler cap is an indication of excessive blow by in the combustion chambers past faulty/ worn/ broken rings.

Mar 28, 2014 | 2002 GMC Savana

1 Answer

Location of pcv valve

Could be the gasket leaking.

May 20, 2013 | Cars & Trucks

1 Answer


See here p147 for a diagram

The PCV valve and hose are on the suction (vacuum) side of the throttle, and this is meant to **** oily crankcase vapours into the inlet manifold for burning.
This should be replaced by fresh air from the upstream or atmosphere side of the throttle, the top hose in the diagram.
When the PCV valve and its hose gets blocked, and the engine is a bit worn, Combustion blow by pressure and oil vapour in the crankcase builds up and is not sucked through the PCV valve. Instead it is forced into the intake tract.
So check the PCV valve, hose, and bleed return hose to make sure they are clear OK. If the problem persists, your engine has probably developed worn piston rings, and blow by is now too high to control properly.

Mar 27, 2012 | 1995 Toyota Camry

2 Answers

Where is pcv vavle located on 1983 nissan pickup 2.4l engine?

PCV valve is located on the valve cover or on the oil breather line, you shouldn't be able to miss it.I hope I could help!!!

Dec 24, 2009 | 1983 Nissan Pickup

3 Answers

I am installing a Holley 2818 on my '65 327 and need help with routing the PCV lines. Which line goes to the PCV inlet on the carb? The rear block inlet or the one on the oil filler neck?

On the 2818 holley there is a calibrated elbow on drivers side of carb about centre of the main body.This connects to oil filler stand pipe in front of intake.Fresh air hose goes from air cleaner to back of block where road draft tube used to be before PCV came along.
The calibrated elbow serves as PCV metered orifice.Be sure flame arrester screen is inside of air cleaner on fresh air connection.

George W.

Nov 02, 2009 | 1965 Chevrolet Corvette

5 Answers

White smoke

White smoke is usually oil...sounds like the engine is burning oil thru the pcv system. Somehow oil is getting sucked backed down the intake and getting used again. Try changing the pcv valve on top or near the valve cover. It usually has a tube going to the carb base. Remember, all engines draw air in like a vacuum.....find your oil leak, and you will cure your smoke prob. Good luck.

Oct 20, 2008 | 1988 Mazda B2200

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