97 Catera Oil cooler re-assembly milky oil in intake
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Cadillac Catera and Cimarron Forum Discussion, 97 Catera Oil cooler re-assembly milky oil in intake in Past Cadillac Vehicle Discussion; I put the finishing touches on my elderly neighbors 97 Catera oil cooler, o-ring, intake, and valve cover gasket repair ...
  1. #1
    kobrien8 is offline Cadillac Owners Fanatic
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    97 Catera Oil cooler re-assembly milky oil in intake

    I put the finishing touches on my elderly neighbors 97 Catera oil cooler, o-ring, intake, and valve cover gasket repair and I started the car and had very very milky white oil dripping out of one of the vacuum lines on the back of the intake plenum. I took the whole plenum off and had a lot of this substance dripping out of the bottom. The intake tubes were totally coated and down at the bottom of those tubes they were both full of this substance. My question is this....were these tubes probably full at the bottom when I started the job and now the car is sucking it back up though the intake, and the problem will be solved once I clean out the bottom of the intake tubes and obviously do another oil change.....or is this coming from somewhere else? The oil on the dipstick is milky white as well, along with the oil covering the cams (I pulled the oil fill tube to look inside). I only let the car run for about 45 seconds, so how did all of this oil get contaminated? Here are some pictures of what I found.....

    Here is the intake..
    IMAG0141.jpg

    Here are the rear intake vacuum lines
    IMAG0142.jpg

    Here are the bottom of the intake tubes, full of this stuff!
    IMAG0143.jpg

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    kaustein is offline Cadillac Owners Enthusiast
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    Re: 97 Catera Oil cooler re-assembly milky oil in intake

    I believe that that is an indication of water somewhere it isn't suppose to be.

  4. #3
    kobrien8 is offline Cadillac Owners Fanatic
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    Re: 97 Catera Oil cooler re-assembly milky oil in intake

    Well I was given the task of fixing the car because it was leaking oil and antifreeze like crazy. The antifreeze was coming from the oil cooler plate, the oil was from the valve cover gaskets. The oil cooler was also leaking oil in to the antifreeze. I put everything back together, with fresh oil and antifreeze and for some reason the intake is full of this stuff.

  5. #4
    investor74 is offline Cadillac Owners Enthusiast
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    Re: 97 Catera Oil cooler re-assembly milky oil in intake

    The Catera equivalent of a PCV valve is the "breather" located on the back of the engine. Search some past threads, members have posted instructions for cleaning it.

  6. #5
    kobrien8 is offline Cadillac Owners Fanatic
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    Re: 97 Catera Oil cooler re-assembly milky oil in intake

    I am at a complete loss here.....I took everything apart again, cleaned every single part including the breather box, and re-assembled everything from the lower intake flange upward and the car started perfectly. It ran great for about 2 minutes then started running rough. I shut it off only to find the milky white oil pouring out of the intake plenum and down the intake tubes again!!!!! How is this happening? The intake sucks air from the outside, yet it is dumping "oil" right out the front of the intake. I am at a complete loss. I have searched this forum for hours and can't come up with anything. If it was my car I would just junk it, but its for my neighbor and he wants to keep it, especially now that he has dumped money in to the oil cooler fix! How in the world is oil blowing out the top like that??

  7. #6
    rruff98 is offline Cadillac Owners Member
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    Re: 97 Catera Oil cooler re-assembly milky oil in intake

    hello, did anyone figure this problem? i think i might have the same issue... i got the oil filler cap full of the milky sludge and its leaking coolant in the back engine...its cold here right now in alberta but i suspect its my oil cooler so im planning on relocating it with external oil cooler. but my other problem is it will start and die right away if my intake is full of this sludge the engine is not getting any air and chocked and stall the engine if my assumption is correct. it has 231k. also with the breather can i run an oil catch can instead of running it thru the breather box again? im hoping the weather gets nice here in alberta so i can start my operation of my catera i miss driving it.

  8. #7
    JohnJJO's Avatar
    JohnJJO is offline Cadillac Owners Fanatic
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    Re: 97 Catera Oil cooler re-assembly milky oil in intake

    heater control valve broken inside, air hose that controlling valve position now sucking coolant that traveling all way to intake and then in to cylinders where create miss fire

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