1996 Mercury Marquis BACK PRESSURE

1996 MERCURY MARQUIS
184,000 MILES • V8 • 2WD • AUTOMATIC
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JAMESVERNON45
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  • 1 POST
I have back pressure coming up oil dipstick and oil fill hole, car is smoking ,car runs good when on the highway ,car idles ruff
Nov 8, 2009 at 6:27 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,244 POSTS
Make sure the PCV valve is working. If it is, you have what is called "Blow By". What that means is this. When engines start to wear out, the rings in the cylenders allow more and more compression to get past them which builds in the crank case of the engine then finds a way out through areas you mentioned. Make sure the PCV is clear and working before jumping to concolusions. Its job is to draw pressure from the crank case. Also make sure the hose going to the PCV is clear. I've seen them plug too.

Let me know what you find or if you have other questions.

Joe
Nov 26, 2009 at 4:43 PM
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