Question about 1993 Mitsubishi Eclipse

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1993 4g37 blowing oil back through intake. Replaced PVC. Only will crank by opening the air filter container and still lots of blow by.

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This is actually very common in fact if you own an eclipse that doesnt have atleast some blowback i would be amazed unlees it causes issues with the functionality of the enigne running i would recomend just keep an eye on ur oil and dont fix it unless it is an absolute must because on these cars you can never fix just one issue and you wouldnt want to cause more problems by trying to fix one that isnt really a big deal

Posted on Mar 24, 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


All Ford 5.0l engines

A lot of people don't know this. On some Ford 5.0l engine there is a little filter below the positive ventilation crankcase (PVC) valve. Too many people have replaced only the PVC valve thinking the reason for oil blowing out of the valve covers, and any other gaskets or seals, will correct the problem. In reason, the PVC is one of the main areas to check and is the easiest and cheapest way to go. In all, the PVC filter is to blame. Remember preventive maintenance goes a long way have your oil changed regularly.Lee Davidian

on Jan 09, 2010 | Ford Crown Victoria Cars & Trucks

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pvc valve is not supposed let go but one direction replace

Nov 08, 2013 | 2002 Chevrolet Tahoe

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Engine has blowback what the possible causes and how do I repair it?

I think you mean blow-by, you fix it with a new engine, or remove that engine and rebuild it. the rings are shot and the only fix is a new set of rings. if they are shot, the whole engine needs a rebuild.

Blow back is for example 1800s US gunboat diplomacy forces japan to open trade with the west, the blow back is WWII, pearl harbor, invasion of china, etc. Or when the post WWII western powers decide to take palestine from the palestinians and make israel out of it. Read any news source any day of the week for the past 40 years and the next 200 or so to see how unhappy this has made the Palestinians.

During normal operation, a small amount of unburned fuel and exhaust gases escape around the piston rings and enter the crankcase, referred to as "blow-by".[7] If these gases had no controlled escape mechanism, the gasketed joints would leak (as they "found their own way out"); also, if the gases remained in the crankcase and condensed, the oil would become diluted and chemically degraded over time, decreasing its ability to lubricate. Condensed water would also cause parts of the engine to rust.[8] To counter this, a crankcase ventilation system exists. In all modern vehicles, this consists of a channel to expel the gases out of the crankcase, through an oil-separating baffle, to the PCV valve, into the intake manifold. In a non-turbo engine, the intake manifold is at a lower pressure than the crankcase, providing the suction to keep the ventilation system going. A turbo engine usually has a check valve somewhere in the tubing to avoid pressurizing the crankcase when the turbo produces boost.
If an engine is damaged or enters old age, gaps can form between the cylinder walls and pistons, resulting in larger amounts of blow-by than the crankcase ventilation system can handle. The gaps cause power loss, and ultimately mean that the engine needs to be rebuilt or replaced.[7] Symptoms of excessive blow-by include oil being pushed up into the air filter, out the dipstick,[9] or out the PCV valve. In rare cases of serious piston or ring damage, the oil filter housing's sheet metal can even burst at its seam.
[edit] Open crank engine

Jul 14, 2011 | Volkswagen Jetta Cars & Trucks

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Oil blow backs into the air box the ccv system have replaced all elbows lines and fittings

Chances are you have worn piston rings. this will cause compression in your crank case blowing the oil into your a air intake.

Jan 11, 2011 | 1993 Jeep Wrangler

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Cylinder 3 misses and has carbon biuld up on plug also looks to have oil on the plug, smell like oil is burning , smokes alot out of tail pipe,oil consumtion is a qt, per 300 miles and it looks like oil is...


U got a bad piston rings! U have to pull down the PiSTON to replace the PiSTON RiNGS, oil is getting in ur combustion!


Check also the valve guide oil seal, hope that is the faulty one! 'Cause replacing PiSTON RiNGS will cost a LOT!

Check on that first, Oil in ur air filter means a BLOW BACK gas from ur combustion is pushing the oil into the air filter!

BLOW BACK is a residual combustion air that should have been burned or gone thru the exhaust, but w/ poor seal of ur piston ring, it goes into ur CRANK CASE and into ur EGR system w/ excess oil!

Hope that explains everything!

Dec 02, 2010 | 1987 Toyota MR2

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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

1 Answer

1997 nissan pickup 4 cylinder 1.8 ltr I believe. Oil is blowing back into the air filter. The small filter inside the air breather that catches the oil from the Rocker Cover gets filled with oil and...

has to have pcv or somebody took it out for some reason but if u are getting oil in the air filter like that most likly u hav a broke ring on one of your pistons

Oct 03, 2009 | 1997 Nissan Pickup

4 Answers

Oil in the air filter

Well this this will be you valve cover gaskets leaking. Try to feel around or look to see if there is fresh oil around the valve cover. Oil being sucked in to the air filter is a sure sign of a leak in your engine compartment. Check your oil levels also. Hope this helped.

Jan 04, 2009 | 2002 Ford Explorer

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