Question about 1989 Toyota Supra

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Why do I have oil in the intake manifold and air intake chamber on a 1989 Supra.

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Try replacing the PCV valve..
Might be causing a back presure..

Enjoy your day..

Posted on Sep 10, 2009

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How do the crankcases gasses get into the intake air chamber of my 2002 volvo xc70 and does this or can this make the ngine rough


It's possible that you may have either a clogged breather box or broken breather box hose. The breather box is located under the intake manifold. It is sometimes also called an oil trap.

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How is oil getting into my intake manifold


All vehicles are equipped with a PCV (positive crankcase ventilation) valve that is located on top of a valve cover and connected to the intake manifold with a rubber hose. When the engine is running, there is some pressure from the combustion chambers that gets past the piston rings and into the crankcase. This is known as blowby. The PCV valve allows this pressure to be relieved and vented into the intake manifold. A thin film of oil will form in the intake manifold since the hot gases from the crankcase contain an oil vapor that cools and condenses once it is in the cooler air of the manifold.

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Tube from exhast manifold to intake what is it


It is the area of the engine where the fuel and air go into the engine. It usually has the fuel injectors connected to it. It is bolted to the engine.An intake manifold is used on most vehicles. The intake manifold delivers the air & fuel mixture to the combustion chambers of your engine for ignition

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89 chevy s-10 blazer 4.3L uses anti freeze but nothing leaks i know its burning it cuz white smoke comes out the tail pipe im trying to decide whether its a intake or a head problem just need another...


If you have white smoke coming out your exhaust, it has to be a head gasket. The symptoms of an intake manifold leak are either and external leak (leaking on the ground) or water in the crank case (mixing with the oil and making it look like chocolate milk-shake) A leaking intake gasket will not cause the antifreeze to enter the combution chambers.

To diagnose which head is leaking, you can remove the valve covers and remove all the rocker arms then put compressed air into each spark plug hole and watch the radiator for bubbles. Looking at the spark plugs may also tell you without having to do this...The spark plug in the leaking cylinder will be very white on the electrode.

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Clogged PCV Valve
The main purpose of the PCV (positive crankcase ventilation) valve is to recirculate blow-by gases back from the crankcase area through the engine to consume unburned hydrocarbons. Blow by is a mixture of air, gasoline and combustion gases forced past the rings on the combustion stroke. The PCV system usually has a tube leading from the crankcase to the carburetor or intake manifold. Vacuum within the engine intake manifold pulls blow by gases out of the crankcase into the combustion chamber along with the regular intake of air and fuel.
Worn Piston Ring Grooves
For piston rings to form a good seal, the sides of the ring grooves must be true and flat - not flared or shouldered - and the rings must have the correct side clearance in the grooves. Normally, automotive ring groove side clearance should not exceed .002-.004. As the pistons move up and down, the rings must seat on the sides of the grooves in very much the same way that valves must seat to prevent leakage. New rings in tapered or irregular grooves will not seal properly and, consequently, oil will pass around behind the rings into the combustion chamber. Worn grooves are usually flared or tapered causing increased side clearances which permit more than the normal amount of oil to pass the rings into the combustion chamber. Excessive side clearances also create a pounding effect by the rings on the sides of the piston grooves. This promotes piston groove wear and, if the condition is not corrected, breakage of rings lands may occur.
Cracked or Broken Ring Lands
Cracked or broken ring lands prevent the rings from seating completely on their sides and cause oil pumping by a process similar to that described in #7. In addition to this, they also lead to serious damage to the cylinders as well as complete destruction of the pistons and rings. Cracked or broken ring lands cannot be corrected by any means other than piston replacement and this should be done as soon as there is the slightest indication of a crack.
Worn Valve Stems and Guides
When wear has taken place on valve stems and valve guides, the vacuum in the intake manifold will draw oil and oil vapor between the intake valve stems and guides, into the intake manifold and then into the cylinder where it will be burned. If this condition is not corrected when new piston rings are installed, an engine is likely to use more oil than it did before because the new piston rings will increase the vacuum in the intake manifold. When gum or deposits on the valve stems are removed - a procedure recommended when overhauling an engine - the seal previously formed will be removed and leakage will be more pronounced. This is particularly true on overhead valve engines where loss of oil may occur on the exhaust valves as well as on the intake valves. High oil consumption caused by too much valve guide clearance can frequently be cured by reaming or nerraling the valve stem. In some cases new valves may also be required. Use of a permanently bonded valve stem seal will give added insurance against oil leakage on complete engine overhauls or on valve jobs. Large Oil Leaks Leaking valve cover gaskets, leaking crankshaft front and rear seals.

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Tourqe specs for 2.8 liter motor.


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1 Answer

THERE IS ENGINE OIL COMING IN MY AIR FILTER CHAMBER?my toyota is 1998 model .


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Sep 24, 2010 | 1998 Toyota Corolla

1 Answer

My 1989 350 suburban show the oil pressure maxed above 60 on the gauge. this occurred at the same time as a leak occurred in the intake manifold releasing a small amount of water into the oil. I have...


sometimes you can get a little water trapped. you can try removing the sending unit and cleaning it. you will probably have to replace the unit. the pressure is acceptable though as long as youre not pourong oil out through the seals.

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2 Answers

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