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Flame Trap Question 850 1996

posted by  georgep on  Sun Aug 31 16:29 CST 2003
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I have read several posts about the importance of keeping the flame trap clean on normally aspirated engines since this device takes the place of a PCV valve.
While removing the flame trap for cleaning from my 96 850 (81K miles) I noticed that there are actually 2 nipples on the upstream end of the flame trap housing. There is an approximately 1/2" nipple as well as a smaller nipple. This 1/2" hose is obviously the hose through which most of the gasses flow. However I noticed on the small nipple that it had the remnants of a deteriorated small rubber hose stuck but there was no hose attached to it. I looked for the other end of the hose that may have been there at one times was was unable to find anything. Not having a hose attached to this smaller nipple would appear to create an opportunity for a vacuum leak.
Does anyone have any ideas where the smaller vacuum hose on the inlet side of the flame trap housing is supposed to be routed to??
Thanks in advance for any information on this!
GP








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    Flame Trap Question 850 1996

    posted by  Gerald C on  Mon Sep 1 13:56 CST 2003
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    The smaller hose on the flame trap tends to deteriorate, as you discovered. It should connect to the vacuum stack manifold, second nipple from the top. The other poster Dennis has the right link:

    http://volvospeed.com/Repair/vacuum_lines.htm

    Look at the second picture down from the top. The small black plastic manifold in the middle of the pic is just behind the idle air valve. There are two small hoses connected to it going toward the rear of the car. The lower of the two hoses should connect to the small port on the flame trap. I've just been through this too. Hope this helps.

    Gerald C








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    Flame Trap Question 850 1996

    posted by  Dennis 850GLT on  Mon Sep 1 11:03 CST 2003
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    last visit: Sat Aug 13 08:42 CST 2011
    [RELATED]

    Hi George,

    I have a '96 and I used to have exactelly the same problem.
    The other end of that small hose (vacuum elbow) is connected on the right
    side of the intake manifold next the power steering pump just below
    the t-stat.

    Check the 1st pic on the top at this link
    http://volvospeed.com/Repair/vacuum_lines.htm

    --
    Dennis







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