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Using about 1.5 qts of oil in 1300 miles-crankcase vent lines into air intake show a lot of clean oil-obviously it is pulling a lot of oil out of the valve covers into the engine-this is a new problem it did not use oil previously

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Check and replace your PCV valve

Posted on Nov 17, 2009


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Still have crankcase pressure issues (pressure at dipstick and oil filler cap) after replacing oil trap.

Sounds like your engine has worn piston rings and that allows combustion pressure to "blow Bye" the pistons and pressurize the crankcase. In short you need an overhaul.

May 16, 2016 | 2006 Volvo V50 2.4i

2 Answers

Locate pcv valve.pulled throtle body nothing or valve covers

Crankcase ventilation system is used to consume crankcase vapors created during the combustion process instead of venting them to the atmosphere.
Fresh air is supplied through a filter to the crankcase, the crankcase mixes the fresh air with the blow-by gases and then passed through a positive crankcase ventilation (PCV) orificed tube into the intake manifold.
The PCV orificed tube restricts the flow rate of the blow-by gases using a 3 mm (0.118 in) (a) orifice located at the end of the tube. If abnormal operating conditions arise, the system is designed to allow excessive amounts of blow-by gases to back flow through the crankcase vent tube into the throttle body in order to be consumed by normal combustion. Positive Crankcase Ventilation Hose/Pipe/Tube Replacement
Remove the two nuts (2) from the fuel injector sight shield (1).
Lift the sight shield (1) from the front and pull forward to disengage the rear tab from the bracket.
Disconnect the PCV fresh air tube from the left camshaft cover.
Remove the PCV fresh air tube from the throttle body.
Remove the drive belt. Refer to Drive Belt Replacement .
Remove the power steering pump retaining bolt.
With the hoses still attached, Carefully position aside the power steering pump.
Remove the retaining clip securing the PCV dirty air tube.
Disconnect the PCV dirty air tube from the PCV orificed tube.
Remove the PCV dirty air tube from the intake manifold.

Feb 25, 2016 | 2004 Cadillac Seville

1 Answer

What causes excessive crankcase vaccum, besides pcv. Pcv confirmed OK and functioning, all vacuum lines routed correctly 07 f150 5.4 3 valve

I can only think there is a fault somewhere in the pcv system that has somehow been overlooked.

The vacuum part of the pvc system provides the motive power for the flow of clean fresh air through the crankcase and into the inlet manifold via two routes, taking with it the various crankcase emissions to be burned up during the combustion process.

At idle and low revs and other times when manifold depression is high, such as during overrun, crankcase emissions tend to be drawn through the pcv valve directly into the manifold and at other times, when engine speed and load increases the venting increasingly takes place through a second vent into the air cleaner or intake. At low speed, etc. the second vent becomes the supply of clean fresh air for the crankcase.

In the early days of the pcv system some engines had fresh air supplied via a filter fitted to the crankcase and others used a vented oil filler cap. A few engines had no air inlet at all and the manifold was simply connected directly through a length of half-inch hose to the valve cover. Those engines almost never leaked oil...
For a few years BMC used a complicated vacuum regulator valve mounted on the crankcase and again a large bore hose to the manifold.

Since those days most manufacturers have settled on one of two systems using either a pcv valve or a small air bleed into the manifold to provide the motive power for the ventilation of the crankcase. Mostly there is a flame or spark arrestor/oil mist trap in the breather that sometimes becomes blocked and causes trouble, though the trouble is usually the opposite of too much vacuum.

I suggest you go back to the drawing board and recheck everything. During a service I usually test the breather by putting the compressed air blow-gun down the dipstick tube and sealing it with a cloth. If the crankcase breather is clear and working properly no pressure will build up inside the engine.
Obviously some caution is needed to avoid blowing out seals and gaskets if the breather is found to be inadequate.

Aug 08, 2015 | Cars & Trucks

1 Answer

2008 Silverado 5.3 liter engine is consuming a lot of oil, why?

The short answer is, if there are no external leaks, the engine has to be burning it thru the rings, crankcase vent, or valves.
You could burn a quart a week and not see any evidence until it builds up on the spark plugs over time.

Jan 23, 2013 | Cars & Trucks

2 Answers

My 2.0L cortina is blowing oil out the filler cap and lots of blue smoke out exhaust and also leaking oil from back of motor and running down top of bellhousing

Generally speaking, you are describing an engine that has a crankcase that can not breath.
Pressure in the crankcase is supposed to be vented into the intake by way of the PCV valve. The crankcase pulls fresh air from the air cleaner.
Cortina is not a brand sold in the US, so I don't have direct info on it.

Jan 16, 2013 | Mitsubishi Galant Cars & Trucks

1 Answer

I have a honds civic 1.5 lsi, which ever sinse i put oil in it (10w 40) has had lots of white thick smoke coming from the exhaust and got oil on the spark plugs, i changed the plugs and within a few miles...

You may have put in too much oil. Check the oil level dipstick and see if the oil level is above the full mark. If so, you'll have to drain some out until it is down to the full mark. Too much oil will block engine crankcase venting passages and lead to pressurization of the crankcase.

If the oil level checks out okay, check for a stuck positive crankcase ventilation valve (PCV). If the crankcase cannot vent blowby gases, it will pressurize and oil will be forced past the intake and exhaust valve guide seals causing heavy oil burning. The engine will also run terrible.

Mar 05, 2011 | Honda Civic Cars & Trucks

1 Answer

Oil filler cap creamy not overheating dipstick and water levels fine just started running of cylinder had been odd puffs of smoke

If the car is used mostly for short trips, a creamy oil cap is not unusual. Try to use this car for the occasional long trip to dry it out. The concern is that the oily sludge will fill up the tube that runs from the front corner of the valve cover down to the crankcase ventillation valve under the intake manifold. If that hose plugs up (typically only happens if the sludge freezes) the system can start sucking oil up through the oil drain from the crankcase ventilation valve and pumping it into the intake manifold. This problem is rare, usually seen only in 6 cyl BMW SUVs that are used for running errands in mountain communities and never really warm up, but it can happen if you have a lot of water/oil sludge buildup.
The rest of your problem statement is not completely clear. Missing a cylinder when cold is very common and may be caused by any one of several problems. If it smooths out after a minute or two, it is not a big concern. If the car misses on a cylinder after it is warm, check the age of your spark plugs, they should be replaced every 50k miles or so. Try pouring some fuel injector cleaner (Techron is the most popular) through it. A weak coil is also a possibility Early e46s had some coil problems, but I would expect that if you were going to have coil problems, they would have flared up long before now unless this is a really low mileage car..
The reference to odd puffs of smoke is a little unusual, but it is what reminded me of the possible problem with sludge plugging up the crankcase vent line. I suggest that you pull that line off the front of the valve cover and look inside. If it is full of sludge, get that system cleaned out.

Mar 04, 2011 | 1999 BMW 323 Series

1 Answer

Removed air intake hose to clean throttle body and noticed oil inside. Why???????????

The pcv valve vents the crankcase vapors into the intake to be burned. That vapor has oil in it and the oil will sometimes accumulate in the hose and throttle body. It's normal for all cars to have a bit of oil in there. Just needs to be cleaned out every so often.

Jan 27, 2011 | Honda Accord Cars & Trucks

1 Answer

Oil in air filter wot causes this car in qustion is a jag xj8

This issue is caused by crankcase pressure issue.
Normally filtered air enters the engine, runs through the crank case and then is pulled into the intake through the PCV valve. Durning hard acceleration, the PCV valve closes (to prevent explosion of fumes in crank case and blowing valve covers and pan off) and the PCV system reverses, with fumes coming back through the filtered intake.

Usually there is minimal oil that gets back into the air cleaner.

So, when somthing goes wrong, like excessive blow by, for example, the crankcase pressure overcomes the PCV valve and intake of fumes capability, and oily starts showing up in the air filter.

Investigate the crankcase pressure and PCV system.

Oct 14, 2010 | 1998 Jaguar XJ8L

6 Answers

86' Porsche 944 turbo

well it could be the seals, but also you may have to look at other sources of the oil, i have been reading this thread i found online and somehow the problem poster had almost the same as yours and was able to trace where the oil is coming from. here is the thread good luck, hope you get the culprit identified.

Oil Leak on Porsche 944 Turbo intake

Aug 03, 2008 | 1986 Porsche 944

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