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Anonymous Posted on Sep 18, 2014

Why is my fuel mixing with oil

My 1990subaru legacy has been skipping real bad and black smoke is coming from exaust. When i checked oil it seemed very lean and smelled like gas.

2 Answers

Kevin Blair

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  • Subaru Expert 196 Answers
  • Posted on Dec 14, 2014
Kevin Blair
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Given the age of the car it could be bad spark plugs or a weak ignition system. Check all the plugs and inspect them with this chart in the link below. It could be a valve issue as you said you smell gas in the oil.

dlampman

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  • Subaru Expert 111 Answers
  • Posted on Dec 13, 2014
dlampman
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I'm afraid your Subaru has burnt a valve. Typically it is the right rear cylinder (looking at it from the front of the car) that burns them. this is a common problem. It's an expensive fix. There is a chance however, it may just be a fouled spark plug. Again, it's usually the right rear spark plug that fouls. You can pull each plug wire one at a time (start with the right rear one) until you find one that doesn't make the engine run worse. Then change that plug and try it. Or replace all the plugs. If one is fouled then the others may also need changing.
HTH

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5 Related Answers

Anonymous

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  • Posted on Jan 19, 2009

SOURCE: 1995 subaru legacy wagon has

broke piston rings, engine needs overhaul.

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Anonymous

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  • Posted on Feb 02, 2009

SOURCE: clutch is slipping real bad on my 95 subaru legacy

the flywheel may be shiny and slippery. Also the clutch may be very worn down. You will probably need to replace the clutch.While you have to remove the throwout bearing. replace that too.

Anonymous

  • 1 Answer
  • Posted on Mar 06, 2009

SOURCE: Gas smell with Subura Legacy

there is a recall on some of the fuel lines under the hood, they get old and leak.

JIMMY

  • 1374 Answers
  • Posted on Mar 24, 2010

SOURCE: 2002 Legacy 2.5,Auto,stubbles bad in low gears

I'm gonna do this from memory because my All Data is not working. I believe that the EGR is stuck open, your getting too much ERG or getting it at the wrong time. Easy fix either free up the valve test it with a vacuum gauge erase codes and try it out.
Use shop manual easy steps in doing this.

Anonymous

  • 141 Answers
  • Posted on Jun 05, 2010

SOURCE: 98 Subaru leaking oil

Oil leak will not change run temp but can cause a fire.
The smoke is the oil burning on the engine. The 1st thing you need to do is clean the oil off the engine.
Next top oil off to the full line on the dip stick.Now start the engine hold idle up to around 1600 rpm for 1 to 2 minutes keep engine run and look for the oil leak. Don't get caught in any moving parts and things will be hot so be careful. Most likely from your valve cover.

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Have you done a service recently? If you havent, then you need to change all the standard parts...
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I assume when you said that it's skipping real bad, you meant it has a missfire. This could be caused by the lead wires so check those first.

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The Symptoms tell me it is a head gasket. A leaky or bad head gasket would cause all of the problems that you mentioned.

Burning water causes White Smoke, Burning Oil causes Black Smoke. The oil and water are mixing with the gas in the cylinders and causing it to run bad. Pull out the dipstick and look at the oil on it. Does it look like good oil? Or does it look watery and or foamy or grey colored. Open up the radiator and look inside, do you see oil?

This seems almost text book to me... I would have someone local to you to have a look at it to be sure.
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