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Mystery Plug and Unknown Smell S70 1998

posted by  Obstinado on  Wed Oct 14 05:07 CST 2009
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last visit: Sun Feb 19 14:31 CST 2012
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There is a strong gas/exhaust type smell in the cabin of my recently acquired 1998 V70 GLT. Almost smells like the engine is running rich and seems to intensify with the heat/AC turned on. The car passed all local safety and emissions tests, so I didn't really think much of it until I found a tiny plug in the engine bay. I've located a diagram of the engine and where the plug should fit, but don't know enough to understand what purpose it serves, or how much work is envolved in replacing it. I'm thinking it might have something to do with the smell issue. Any thoughts?

Thanks in advance.
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    Mystery Plug and Unknown Smell S70 1998

    posted by  KlausC on  Sat Oct 17 04:43 CST 2009
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    last visit: Fri Oct 24 10:15 CST 2014
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    I feel like a real dummy! I looked at the first picture and my logic turned off!
    There is a plug on the driver's end of the valve cover to keep water out. It fits into the groove of the cover and and has room for wires to go past it.

    Not the block.

    Klaus
    --
    Proud owner of a 1967 220S. If I had more room, I would have more Volvos.








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    Mystery Plug and Unknown Smell S70 1998

    posted by  KlausC on  Fri Oct 16 09:32 CST 2009
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    last visit: Fri Oct 24 10:15 CST 2014
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    I wish I still had my 1998 so I could compare engines. Where did you find this plug? If it fell out of the block, shouldn't it have been on the side of the road somewhere?
    The previous owner might have had a block heater installed where the plug was, so I would suggest tapping the plug back in. If it is loose, then stop by a Volvo shop parts dept and compare it to a new one. The plug is pressure fitted.

    Then, check the PCT nipple for blockage. It connects a vacuum hose to the air intake hose near the turbo intake. If it is not clean, the pressure in the crankcase can build up and pop the plug back out or blow a seal or two.

    After plugging the hole, change your cabin filter.

    Klaus
    --
    Proud owner of a 1967 220S. If I had more room, I would have more Volvos.








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      Mystery Plug and Unknown Smell S70 1998

      posted by  Obstinado on  Fri Oct 16 17:20 CST 2009
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      last visit: Sun Feb 19 14:31 CST 2012
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      I guess I should have been more specific. I was checking the condition of the spark plugs and found it just sitting under the spark plug cover (item #19 in the first of my diagrams/URL). A subsequent Google search revealed a post on another site (see this URL: http://www.volvo-forums.com/t26196-98-s70-glt-plug.htm)where the poster claims to have ended up with the same part after some engine work. I have a strong suspicion that it was accidentally left out during similar work on my car. Otherwise, it would never have end up under the cover.








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    Mystery Plug and Unknown Smell S70 1998

    posted by  someone claiming to be ksg on  Thu Oct 15 11:10 CST 2009 [RELATED]

    If the car has no symptoms and you smell fuel - my experience is that when weather turns cooler fuel lines shrink a bit and sometimes leak, especially on older cars. It could be transient so they resettle or you might need to check a few of the clamps. I don't think it takes much fuel for your nose to pick it up. Also some cars (maybe also as they age) seem to run very rich at startup in the cooler weather, and then recover after a minute or two - is the smell persistent?

    Don't know where you are located - please disregard if your home is in Calcutta or Riyadh!








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      Mystery Plug and Unknown Smell S70 1998

      posted by  Obstinado on  Thu Oct 15 12:38 CST 2009
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      last visit: Sun Feb 19 14:31 CST 2012
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      It is persistent yes, and the smell is very much evident even on warmer days. Also, it smells more like exhaust than unburned gas.







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