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  1. #1
    Fresh Catch
    Join Date
    Jan 2013
    Location
    Puyallup, Washingon
    Posts
    34

    Water pump change messed up idle?

    Hey guys I'm stumped? This afternoon I realized I was leaking coolant from my water pump in my 94 YJ (2.5 4cyl). So obv I went and picked up a new water pump and gasket. Prior fixes to this I did the thermostat and the radiator and have been working on cleaning the cooling system. So anyways pulled it apart. Installed new. Put it all back together just perfect and hooked back up the negative battery terminal. Filled my radiator with some coolant and water and started her up. Immediately idling high like in 2100-2500 rpms. I burped the system for a bit letting it take fluid and refilling. Not sure what I did that had anything to do with the idling te but I'm also not really a mechanic of any sort either. Any help or insight would be greatly appreciated. Anything I forgot ask!!


    Sent from J-Dub253WA's iPhone using WAYALIFE mobile app!!

  2. #2
    Caught the Bug
    Join Date
    Feb 2013
    Location
    hastings mn
    Posts
    56
    the computer may need to be relearned
    I would be sure the coolant is burped and full and try driving it around town at different speeds and stop and go
    it should relearn its self after a bit

  3. #3
    Fresh Catch
    Join Date
    Feb 2013
    Location
    Tulsa
    Posts
    19
    Make sure you didn't bump any vac lines loose. The relearn should happen pretty quickly.

  4. #4
    Fresh Catch
    Join Date
    Jan 2013
    Location
    Puyallup, Washingon
    Posts
    34

    Water pump change messed up idle?

    If the crankshaft pulley was moved in any direction during replacement of fan belt would this be the cause?


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  5. #5
    Caught the Bug
    Join Date
    Feb 2013
    Location
    hastings mn
    Posts
    56
    shouldnt cause this issue
    its just a belt and not the timing chain/belt

  6. #6
    Been Around the Block
    Join Date
    Mar 2013
    Location
    Ohio
    Posts
    489

    Re: Water pump change messed up idle?

    Quote Originally Posted by J-Dub253WA View Post
    Hey guys I'm stumped? This afternoon I realized I was leaking coolant from my water pump in my 94 YJ (2.5 4cyl). So obv I went and picked up a new water pump and gasket. Prior fixes to this I did the thermostat and the radiator and have been working on cleaning the cooling system. So anyways pulled it apart. Installed new. Put it all back together just perfect and hooked back up the negative battery terminal. Filled my radiator with some coolant and water and started her up. Immediately idling high like in 2100-2500 rpms. I burped the system for a bit letting it take fluid and refilling. Not sure what I did that had anything to do with the idling te but I'm also not really a mechanic of any sort either. Any help or insight would be greatly appreciated. Anything I forgot ask!!


    Sent from J-Dub253WA's iPhone using WAYALIFE mobile app!!
    Check for vacuum lines, messing with the water pump would have no effect on the idle. You must of hit a vacuum line when doing it.
    To succeed in life, you need two things: ignorance and confidence. Mark Twain

  7. #7
    Fresh Catch
    Join Date
    Jan 2013
    Location
    Puyallup, Washingon
    Posts
    34

    Water pump change messed up idle?

    Seems as if everyone I call is saying the same thing I either hit a vacuum line or I have a nice nasty air pocket blocking the coolant temperature sensor in which is not able to relay back to the computer. I'm going to tilt the front up and continue to try and burp the SOB and if that don't work I guess I'll have someone look at it


    Sent from J-Dub253WA's iPhone using WAYALIFE mobile app!!

  8. #8
    Been Around the Block
    Join Date
    Mar 2013
    Location
    Ohio
    Posts
    489

    Re: Water pump change messed up idle?

    Quote Originally Posted by J-Dub253WA View Post
    Seems as if everyone I call is saying the same thing I either hit a vacuum line or I have a nice nasty air pocket blocking the coolant temperature sensor in which is not able to relay back to the computer. I'm going to tilt the front up and continue to try and burp the SOB and if that don't work I guess I'll have someone look at it


    Sent from J-Dub253WA's iPhone using WAYALIFE mobile app!!
    Just take a quick glance at the vacuum lines first there's not that many look around the fuel rail ( if its fuel injected ) I have a 2.5 in my tj and there is a line close to the pump on the fuel rail
    To succeed in life, you need two things: ignorance and confidence. Mark Twain

  9. #9
    Fresh Catch
    Join Date
    Jan 2013
    Location
    Puyallup, Washingon
    Posts
    34

    Water pump change messed up idle?

    Thanks guys ill check em and do some more diagnostics when I get home from work. Bob it is fuel injected I'm pretty sure we have the same motor to the T. I wonder if there is a detailed description of which exact lines are the vacuum lines? Any way to tell cuz ya of course we were u know up around behind the power steering pump which is right in front of the fuel rail and injectors and throttle body


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  10. #10
    Been Around the Block
    Join Date
    Mar 2013
    Location
    Ohio
    Posts
    489
    Quote Originally Posted by J-Dub253WA View Post
    Thanks guys ill check em and do some more diagnostics when I get home from work. Bob it is fuel injected I'm pretty sure we have the same motor to the T. I wonder if there is a detailed description of which exact lines are the vacuum lines? Any way to tell cuz ya of course we were u know up around behind the power steering pump which is right in front of the fuel rail and injectors and throttle body


    Sent from J-Dub253WA's iPhone using WAYALIFE mobile app!!
    there is a cluster of lines on the driver side of the throttle body there is 4-6 lines start there and trace them, if there all hooked up then start it and pull them off one by one and put your finger over them to see if there pulling vacuum and check for dry rot, when pulling them off be sure to pull them off where they end up, fuel rail, intake, brake booster etc. and not from the throttle body. good luck i hope you get it fixed.
    To succeed in life, you need two things: ignorance and confidence. Mark Twain

 

 

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