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Yellow foam 900

posted by  Adirondacker on  Mon Jan 13 18:09 CST 2014
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last visit: Mon May 12 06:34 CST 2014
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car is a 95 NA (no turbo) bosh ignition.

Engine is a 94, not sure if replaced, but car is verified low mileage (168K, I've had it since 107k).

Engine has has a chug in the idle, recently totally pulled apart air hoses to throttle body, replaced bellows, replaced iac, replaced new air breather box (I had everything from previous cars).

Car runs same. Started seeing too much oil out of oil filler cap, which lead me to clean/replace all the stuff related to the flame trap, throttle body.

Even cleaned the cake out of the PCV valve, and that is all clear now (only thing found plugged, but should have no affect on situation).

Car passes jiggle test some times, some times I open the hood, and it is spitting oil something fierce.

I also am seeing a yellow foam, looks like condensate in the air system with a little oil. But I have never had a foam lining on the main hose to the throttle body, there was even foam blown into the bellows. It has been cold here, but.....

Any ideas on what it is?

Car runs excellent at speed, but chugs at idle, been doing it for years, just a little worse now. Yellow foam has me worried with quantity of it. Oil is fine (needs a change, but color is fine, usually 3-5k between changes, been 7k this time)

I've had my hands on most of the car in the last couple of years, most everything is up to snuff (plugs show oil deposits on rear cylinder, otherwise fine)

Thanks








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    Replace thermostat - Yellow foam 900

    uid 49372's pic
    posted by  740_dan on  Wed Jan 15 09:23 CST 2014
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    last visit: Thu Aug 28 13:10 CST 2014
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    I had a foam problem, although it was white not yellow. I don't know if that means anything?

    Anyway, thermostat was 88 Deg.C, changed it to 92*C and the foam disappeared. Short trips in city driving wasn't heating engine enough to burn off water.

    In colder weather, engine condensation becomes worse with a failing and/or low temp thermostat.

    If thermostat age isn't known, I would replace it regardless.
    --
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    Yellow foam 900

    posted by  Will740turbo on  Tue Jan 14 20:00 CST 2014
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    last visit: Wed Oct 22 16:09 CST 2014
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    Which air system? The PCV system?








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      Yellow foam 900

      posted by  Adirondacker on  Tue Jan 14 20:11 CST 2014
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      last visit: Mon May 12 06:34 CST 2014
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      The foam is not in the exhaust gas recirculation system, but in the crankcase system that goes through the oil/air separator. It has been cold, and I've cut down on the distances traveled with the car untill things are proven. So the short trips could have allowed water to condense in that system, and even enough water to freeze solid in the small hoses.

      I'm repairing the muffler right now, and will take it on a highway spin to see if I can clear it up.

      Eric








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        Yellow foam 900

        posted by  spook on  Tue Jan 14 22:20 CST 2014
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        last visit: Fri Oct 24 08:06 CST 2014
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        Dear Adirondaker,

        Hope you're well. I do not recall a post reporting condensation in the lubrication system. Water in the lubrication system usually signals a failed headgasket.

        Is the oil on the dipstick's tip cloudy/milky? If so, I'd have a test done to see if the headgasket has failed.

        Hope this helps.

        Yours faithfully,

        Spook








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          Yellow foam 900

          posted by  jwalker on  Wed Jan 15 09:30 CST 2014
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          last visit: Fri Jun 6 08:39 CST 2014
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          If it is foamy brownish/yellow/white in color (looks kind of like a milkshake) that does not necessarily indicate a failed head gasket. As noted in my post above that normally means condensation inside the engine. This is usually due to short trips in cold weather. The engine does not get hot enough to burn off condensation inside the engine. This will resolve itself when the weather warms or by a long highway trip that gets the engine good and hot. BTDT...:)








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    Yellow foam 900

    posted by  spook on  Mon Jan 13 22:15 CST 2014
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    last visit: Fri Oct 24 08:06 CST 2014
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    Dear Adirondacker,

    Hope you're well. When were the distributor cap and rotor - and plug wires - replaced? The chugging might be due to a misfire, resulting from a failed/failing distributor cap and/or a plug wire.

    As to oil - where it should not be - did you also clean the brass nipple on the intake manifold, to which connects the narrow black hose, from the flame trap housing's side-arm? If this narrow-diameter black hose - or the brass nipple - is clogged, then cleaning the flame trap is only partly helpful. Excess crankcase pressure - which results from a plugged flame trap/hose/manifold nipple - can push oil past seals and gaskets.

    If you find that the flame trap hose/nipple is/are clogged, inspect the timing belt case for signs of oil inflitration past the front seals. If the timing belt has spent a while with oil on it, replace the timing belt as soon as you can: oil attacks and weakens rubber.

    Hope this helps.

    Yours faithfully,

    Spook








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    Yellow foam 900

    posted by  jwalker on  Mon Jan 13 19:29 CST 2014
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    last visit: Fri Jun 6 08:39 CST 2014
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    Check your dipstick. If the foam is there chances are it's condensation. Both my 240 and 850 have had foam (brownish/yellow) on their dipsticks in cold weather. Sometimes the oil cap gets it too. Take the car out for a long high speed run. Get the engine good and hot. That should burn off the foam/condensation.








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      Yellow foam 900

      posted by  Adirondacker on  Wed Jan 15 19:18 CST 2014
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      last visit: Mon May 12 06:34 CST 2014
      [RELATED]

      All the hoses are clear,

      I think it was me limiting the run of the car (not letting my wife drive it to work on the highway). The foam clogged the flame trap screen, which pressurized the valve cover cap.

      No foam ever on the dip stick, and the oil is clear.

      I think I'm good.

      Thanks all







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