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Dodge: 98 Caravan - Bearing Problem?

  1. #1
    Steve
    Guest

    98 Caravan - Bearing Problem?

    I have a 98 Grand Caravan with a 3.8 Liter engine. When I start it cold, it
    knocks a little until the oil pressure builds, then it is quiet. As it
    starts to warm up, it remains quiet, even under load, but when I rev it up
    to about 2000 RPM and release the throttle, it makes the knocking sound
    while the engine is decelerating. As soon as it reaches an idle, it is quet
    again. This cycle is repeatable. As it heats up more, the knock gets
    worse, to a point where it is there even at an idle. When it is hot, it
    also raises a Low Oil Pressure Alarm.

    Do these symptoms sound like a rod bearing problem, main bearing problem or
    something else?

    Also, I want to compare oil pressure in its current condition to what it is
    after I change bearings, if that is what I do. Is there a way to display
    the oil pressure value through the dash electronics? Or do I need a special
    tool (or mechanical gauge)?

    Thanks.
    Steve



  2. #2
    James
    Guest

    Re: 98 Caravan - Bearing Problem?

    Could it be piston slap?



  3. #3
    Steve
    Guest

    Re: 98 Caravan - Bearing Problem?

    I have heard the term "piston slap" but don't understand exactly what it
    means. Could you please explain what it is and how it could cause low oil
    pressure?

    Thanks!
    Steve

    "James C. Reeves" <com> wrote in message
    news:com... 



  4. #4
    damnnickname
    Guest

    Re: 98 Caravan - Bearing Problem?

    Piston slap does not cause the oil lite to come on, oil lite coming on
    causes lack of lubrication, and that causes engine noises, if it isnt all
    ready to late, you may want to have the oil pressure read. sounds to me
    like you may have a rod bearing or a wrist pin problem.
    Glenn Beasley
    Chrysler tech


  5. #5
    Steve
    Guest

    Re: 98 Caravan - Bearing Problem?

    Glenn,

    Thanks for the feedback. Is there a way to display the digital value of oil
    pressure through the dash display somehow? We had a Ford Aerostar that
    would let us do that, but I don't know about this van. If I get a gauge,
    where can I attach it to check the pressure?

    Thanks,
    Steve

    "damnnickname" <com> wrote in message
    news:talkaboutautos.com... 



  6. #6
    Steve
    Guest

    Re: 98 Caravan - Bearing Problem?

    Glenn,

    Thanks for the feedback. Is there a way to display the digital value of oil
    pressure thtough the dash display? We had a Ford Aerostar once that would
    let us do that, but I don't know if this van will support that. If I get a
    gauge, where would I hook it up? Is there a plug near the oil filter maybe?

    Thanks for your help.

    Steve

    "damnnickname" <com> wrote in message
    news:talkaboutautos.com... 



  7. #7
    maxpower
    Guest

    Re: 98 Caravan - Bearing Problem?

    No, even if there were able to display it you wouldnt want to take that
    reading as a good one, faulty sensors, bad wiring could give a false
    reading, you would have to have the oil sending unit removed and install a
    mechanical gauge at the port coming out of the block ,its easy to do
    assuming you have the gauge, I wouldnt suggest driving it because engine
    damage will occur
    "Steve Judy" <com> wrote in message
    news:yiBwd.586164$D%.. 
    oil 

    maybe? 
    all 



  8. #8
    Sportster4Eva
    Guest

    Re: 98 Caravan - Bearing Problem?

    Steve Judy wrote:
     
    Your description is a textbook case of worn rod bearings..
    May have been caused by long term mild detonation, lack of maintenance,
    or a few other things. How many miles on it?
    If you decide to get it fixed, you might as well do the mains too, and a
    new oil pump. Your oil pressure must be less than 10 lbs. at idle,
    because that's where most of those sensors trigger the light. That's not
    good... especially if you keep driving it that way.


    --
    Paul
    '91 XL1200
    '77 GL1000 (W.I.P.)
    "I feel more like I do now than when I got here"


  9. #9
    maxpower
    Guest

    Re: 98 Caravan - Bearing Problem?

    I got your e mail steve, i dont want to confuse you but i am both people,
    maxpower and damnnickname
    "Steve Judy" <com> wrote in message
    news:Rprwd.273895$.. 
    it 
    quet 
    or 
    is 
    special 



  10. #10
    me!
    Guest

    Re: 98 Caravan - Bearing Problem?

    Noise on deceleration... sounds like scored pistons to me... ..

    Light.. could be a lot of things.. including what it is supposed to
    indicate..

    Take it to someone you trust.




 

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