i dont know if i got the right form but i got a 97 z24 cavalier and i am getting oil in the intake and when i take the cap off i get compression out of it any one know what could be going on there please and thanks
is this the intake MANIFOLD you are talking about? and what cap?
in the intake where it hooks to the air box and if you pull the oil cap off you can feel the compression coming out of here you put the oil in
bennjamin hess wrote:in the intake where it hooks to the air box and if you pull the oil cap off you can feel the compression coming out of here you put the oil in
some pressure is normal coming from there... there's ALOT of moving parts in there, and when parts move, the air around them has to go somewhere.
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does the dip stick pop out??? if not i would say you are in the clear most of the time.
You have a bad PCV valve. You should not have any pressure coming out of the dip stick tube when you take it off after the engine is shut off. If it is blowing the dipstick out of the tube (I'm not sure if the 2.4s have the locking dipsticks like the 2.2s do) then you have whats called blow by where cylinder combustion pressure is getting past the piston rings and pressurizing the crank case. A little blow by is normal but an excessive amount can cause problems. The PCV is there to ventilate the crank case (Positive crankcase ventilation = PCV) and if it stops working then u get the problem you have. Replace it and you should be fine.
97 Cavalier 2.2 5-speed, 88 Camaro IROC-Z 5.7 auto, 91 Firebird Formula 5.7 auto, 88 Conquest TSi 2.6T 5 speed, 93 Silverado ECSB 5.7 auto.
Noquarter wrote:You have a bad PCV valve. You should not have any pressure coming out of the dip stick tube when you take it off after the engine is shut off. If it is blowing the dipstick out of the tube (I'm not sure if the 2.4s have the locking dipsticks like the 2.2s do) then you have whats called blow by where cylinder combustion pressure is getting past the piston rings and pressurizing the crank case. A little blow by is normal but an excessive amount can cause problems. The PCV is there to ventilate the crank case (Positive crankcase ventilation = PCV) and if it stops working then u get the problem you have. Replace it and you should be fine.
that would be great advice, if the twin cam actually HAD a pcv valve.
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^
GMR has got nothing on this
Sorry, guess I should have checked first. There is an oil/air separator though right? If so and it failed wouldn't that cause a similar problem?
97 Cavalier 2.2 5-speed, 88 Camaro IROC-Z 5.7 auto, 91 Firebird Formula 5.7 auto, 88 Conquest TSi 2.6T 5 speed, 93 Silverado ECSB 5.7 auto.
There's a baffle plate on the front of the block, plastic oil/air separator. It doesn't work very well - most if not all 2.4's get oil thru the tube into the intake. The metal separator plate that comes with the GM supercharger kit is a better design, but it won't fit with the stock 2.4L manifold. Maybe with a 2.3L HO manifold... dunno for sure, never tried it.
Usually it's the tiny hole on the front of the intake manifold, between the #2 and #3 intake ports, that is gummed up which worsens the problem, making a nice chocolate milk-like mess in the intake manifold. But it's not as bad as it looks.... just clean it out nice and it'll be good again.
