A few quick questions
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Cadillac Seville / Cadillac Eldorado Forum Discussion, A few quick questions in Past Cadillac Vehicle Discussion; 1. There is something that looks like an O-ring hanging on the end of the oil-filler neck. What is it, ...
  1. #1
    Netjive8's Avatar
    Netjive8 is offline Cadillac Owners Fanatic
    Automobile(s): 1996 Cadillac Seville STS, 1998 Cadillac Deville (Base)
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    A few quick questions

    1. There is something that looks like an O-ring hanging on the end of the oil-filler neck. What is it, and is it something I should worry about?

    2. There is a vacuum tube (PCV?) beside the beauty cover on the front of the engine that keeps pulling out a lttle (only a few mm at most), is this something that could cause problems?

    Thanks, sorry for the picture quality.
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    Ranger's Avatar
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    Re: A few quick questions

    That O ring looks like it came off of the oil filler cap. I'd fish it out before is causes trouble.

    The other pic is probably the PCV valve. If it comes out completely, you'll know it. It'll be a big vacuum leak. Engine may die at idle.

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    Netjive8's Avatar
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    Re: A few quick questions

    Thanks for the quick response, I'll grab that ring out of the filler neck. If it did come off of the oil cap, does it need to be replaced?

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    Ranger's Avatar
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    Re: A few quick questions

    Absolutely.

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: A few quick questions

    Take off the beauty cover and check your PCV piping: The PCV valve itself is in the rear cam cover and leads to a nipple in the intake manifold behind the power steering pump. The connector in your picture is the PCV system fresh air supply and should go to a connector on the upstream (clean air) side of the throttlebody. BTW, all PCV valves are not alike: different part numbers have different flow rates, so you must use the one calibrated for your particular engine.

    The O-ring on the oil fill cap seals that opening, and, believe it or not, is a potential vacuum leak and also upsets the PCV flow rates.

    Check the O-ring on the oil dipstick also - another potential vacuum leak.

    With varying blowby rates depending on engine rpm and power demand you would think a small air leak into the crankcase caused by one of the two O-rings mentioned would be inconsequential: It is not, as the PCV flow at idle and part throttle is part of the air/fuel ratio equation maintained by the MAF, IAT, and O2 sensors.

    After 2000, some Northstars do NOT have PCV "valves": they use a fixed orifice nipple in the rear cam cover and it is not removable. Clean them with a fuzzy pipe cleaner soaked in throttlebody cleaner.

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