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Oil in the intake boot?

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    #1

    Oil in the intake boot?

    ... and in the outlet of the AFM? I just intalled a new air filter and noticed that there is a bit of residue. What causes this?
    Originally posted by chileelky
    amaze about the enthusiasm e30 generate
    Tags: None
    #2
    The tube that goes from your valve cover to the intake boot carries some oil laden air and is reintroduced into the combustion chamber. Some of this condenses in the air intake tubing.

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      #3
      Oil in the intake is pretty much normal for an engine with significant miles on it. It is there partly as a result of wear of the rings, and the resultant increase in blow-by, and partly from worn valve guides & seals.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

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        #4
        Is 82k significant miles? Anyhow, I figured it was normal, but didn't know if that was a sign of a failing PCV, or ring/valve wear. Thanks guys -
        Originally posted by chileelky
        amaze about the enthusiasm e30 generate

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          #5
          180k or more would be significant, but not 82k. But the oil filler cap dipstick seals could be bad, which would cause excessive oil to be drawn into the intake. You might try replacing those.
          The car makes it possible, but the driver makes it happen.
          Jim Levie, Huntsville, AL

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            #6
            its normal, jeeps do it with low miles. mine does it a little but my car has 125000mi. on it


            7speedshop.com

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              #7
              Originally posted by wagonizzle View Post
              Is 82k significant miles? Anyhow, I figured it was normal, but didn't know if that was a sign of a failing PCV, or ring/valve wear. Thanks guys -
              Do m20's have pcv? I'm pretty sure the answer is no but I'm curious.

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                #8
                They do have positive crank case ventilation but not a valve. Inside of the valve cover there is a baffle, if it gets crudded up it can lead to excess oil in the intake, so can unchecked inlet of air (seals etc.) however there will always be some.

                at any rate I recommend fitting the M20 with an oil separator in the vent system this can greatly improve the performance longevity of the engine and other components.

                Comment

                  #9
                  Originally posted by DCColegrove View Post
                  They do have positive crank case ventilation but not a valve. Inside of the valve cover there is a baffle, if it gets crudded up it can lead to excess oil in the intake, so can unchecked inlet of air (seals etc.) however there will always be some.

                  at any rate I recommend fitting the M20 with an oil separator in the vent system this can greatly improve the performance longevity of the engine and other components.
                  Flush your engine out with either Hartland X-treme engine flush, or a mixture of synthetic auto-tranny-fluid & sythetic oil. Then, refill the engine with regular synthetic oil. As far as I know, this is the best way to dislodge engine "sludge"...other than that, change your oil regularly (I change mine every 1500 miles). Furthermore, just slight residual oil traces on your intake tract is not cause for alarm. It means something is not running completely properly, but at the same time, it does not mean that your engine is about to fail.
                  Originally posted by accident
                  I have achieved the title of Douche of the month.
                  Discuss.
                  Originally posted by kronus
                  It was probably pissed off because it didn't want to pay taxes for poor people's healthcare.
                  1990 300ZX TT 5spd ($6,000)
                  1991 318i 4dr 5spd (DD)

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                    #10
                    No PCV in a m20. The crank case vents into the intake. You get a bit of oil in the intake boot and what not. Its not that big of a deal wipe it out and move on. If you find a quart or lots of oil all the time then you have some issues that need to be looked into.
                    Originally posted by Fusion
                    If a car is the epitome of freedom, than an electric car is house arrest with your wife titty fucking your next door neighbor.
                    The American Republic will endure until the day Congress discovers that it can bribe the public with the public's money. -Alexis de Tocqueville


                    The Desire to Save Humanity is Always a False Front for the Urge to Rule it- H. L. Mencken

                    Necessity is the plea for every infringement of human freedom. It is the argument of tyrants.
                    William Pitt-

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                      #11
                      what if the said "oil in the boot" is probably the cause of a failing TPS?

                      I cleaned my TPS out the other day which seemed to alleviate my erratic idle/CEL/etc temporarily. But the motor is acting up again, and I feel it is due to more oil getting in there, but I can't be sure.
                      Claus Luthe is my hero.

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