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  1. #1

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    Signs of a leaking exhaust manifold, wet O2 sensor?

    Is seeing a few water drops sitting on the O2 sensor body and sensor tip a tell tale of a leaking exhaust manifold from drilling it for the O2 sensor? Engine idle went bad after a few runs but okay when accelerating. I pulled the O2 sensor and could see water bubbles on the body and tip.. I stuck my dry pinky in the threaded hole, pulled it out and a water drop sat on my finger tip. Does a drilled out exhaust have a time limit before they need replacing after you drill out an O2 sensor for them?
    Last edited by tiderider; 09-30-2019 at 08:44 PM.


  2. #2
    !!!! wave jumper !!!! 05_RXP's Avatar
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    Should be no time limit. My guess is you have a leak.
    I would pressure test your manifold.

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    moparguy's Avatar
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    I'd say you caught water jacket when you drilled it.

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    This is a 2nd, New O2 sensor after the rebuild. I pulled the 1st one out several times before the previous engine went boom, to inspect for leaks, sensor condition and never saw any water what so ever. This time, it was pretty obvious that the sensor is getting wet.. I'll pull the exhaust and do a pressure test.

    Also, is it normal for the coolant level in the coolant tank to go down slightly after a few rides after replacing or filling from empty? I've added about 1/2 liter after 1 hour of mostly idle and perhaps 15 minutes of ride time. Thank you!

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    moparguy's Avatar
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    Yes because you would have still had air pockets in the cooling system

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    Quote Originally Posted by 05_RXP View Post
    Should be no time limit. My guess is you have a leak.
    I would pressure test your manifold.
    I pressure tested the exhaust manifold by blocking/capping off the large 3/4" nipple, capped off 1 of the 1/2" water nipples and added a hose to the 2nd 1/2" nipple which I attached to a water tap. Ran the outdoor water tap and no leaks after 10 minutes. Is the typical residential water tap pressure enough for the pressure test? It may be 40psi of pressure.. Thank you

  8. #7
    Cosmicbrut's Avatar
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    i had a similar issue earlier this year when the water was cooler. I went through an o2 sensor really fast and noticed water droplets on the sensor.Pressure tested the water jacket on the manifold to 60 psi and no leaks. Been on the same sensor ever since.

  9. #8
    connorrxp's Avatar
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    Do you have a thru hull exhaust?
    Quote Originally Posted by tiderider View Post
    I pressure tested the exhaust manifold by blocking/capping off the large 3/4" nipple, capped off 1 of the 1/2" water nipples and added a hose to the 2nd 1/2" nipple which I attached to a water tap. Ran the outdoor water tap and no leaks after 10 minutes. Is the typical residential water tap pressure enough for the pressure test? It may be 40psi of pressure.. Thank you

  10. #9
    !!!! wave jumper !!!! 05_RXP's Avatar
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    Quote Originally Posted by tiderider View Post
    I pressure tested the exhaust manifold by blocking/capping off the large 3/4" nipple, capped off 1 of the 1/2" water nipples and added a hose to the 2nd 1/2" nipple which I attached to a water tap. Ran the outdoor water tap and no leaks after 10 minutes. Is the typical residential water tap pressure enough for the pressure test? It may be 40psi of pressure.. Thank you
    I pressure tested mine with compressed air but only 20 psi. So I would think 40 psi would be enough.

    When you checked the sensor was it after it was run hard or after it has sat for a bit after it has run?

    Do you blow your water box out after rides?

  11. #10

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    Quote Originally Posted by connorrxp View Post
    Do you have a thru hull exhaust?
    No, I do not have a thru hull exhaust. I still have the waterbox.

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