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PCV replacement/ oil leak... related?

posted by  someone claiming to be scott k on  Fri Sep 23 13:25 CST 2005 [RELATED]

I have had an on-going saga with my 96 855T (92K mi). I think the problems may have started several weeks ago when i had the check engine light diagnosed as an EVAP system leak. The mechanic addressed the problem by replacing the PCV valve, but as they are not really Volvo savy, I'm thinking they may have screwed up. Here's why - soon thereafter, I noticed an oil leak coming from the lower right-hand (passenger side) of the radiator. A second mechanic ("Volvo specialist") found the oil leak to be the O-rings on the oil lines. He quoted me $120.00 per line (2) to replace - or maybe he was just talking about the O-rings, + $130.00 labor. Does this seem reasonable?

A second problem that came up after the first mechanic did the PCV valve, was that on cold start, the engine idles up really high for several seconds. I've read that a clogged PCV can cause both problems. Am I on the right track here?

thanks,

sk








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    PCV replacement/ oil leak... related?

    posted by  someone claiming to be ksg on  Mon Sep 26 02:22 CST 2005 [RELATED]

    I think you have or had 4 separate problems.

    1) The diagnostic light code would tell you if the evaporative emission control is leaking and that should be addressed specfically. Did the light stay off or return after the work was done?

    2) The 850 does not have a pcv valve as such - on turbos or non-turbos there are rebreathing (crankcase vent) lines with different arrangements and orifices. These need to be kept clean to prevent engine oil seals from leaking or blowing out (can be $$$). A clogged rebreathing system would not give you a diagnostic light as its function is not monitored - the light meant something else was/is wrong.

    3) Leaks at the radiator for the engine oil and/or auto trans oil coolers do occur (especially after nearly 10 years) and this is probably independent of the other problems (though a clogged rebreathing system could make it worse). How bad is the leak?

    4) A fast idle at cold start is usually normal - how fast and how long? Cars I've had idle at 1500-1800 rpm for half a minute or more when started cold. Then they settle down. If the car idles fast for a long time with no other defects in performance and no check engine light, maybe the throttle plate, throttle position sensor, idle air motor, or linkage are dirty or sticking. This may or may not trigger a diagnostic code.








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    PCV replacement/ oil leak... related?

    posted by  MadeInJapan on  Fri Sep 23 13:33 CST 2005
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    last visit: Sat Oct 2 06:34 CST 2010
    [RELATED]

    Seems a bit high but the sounds of it are the correct diagnosis. Could be coincidence with the PCV replacement or the lines could have been knocked into during the initial repair, messing up the "O" rings. This can be a DIY job but a bit messy. The Radiator cools oil, not just your coolant, so you'll have oil everywhere if you're not careful. Personally, I would order the parts from www.fcpgroton.com and then ask here how to do the repair. Bay13 on VolvoSpeed may have the instructions, but not sure. Whatever you do, good luck.
    --
    1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon







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