ISUZU NPR owners. I need your help.

Discussion in 'Trucks and Trailers' started by Cheryl, May 20, 2006.

  1. Cheryl

    Cheryl LawnSite Member
    from Florida
    Posts: 95

    After the engine starts, the oil light stays on a second longer than the rest. I don't remember it being that way all the time (have the truck for 3 years), but it is possible. The oil level is correct, and recently changed. I had it done to see if maybe that was a possible problem???? - no change -. The truck is a 95 1/2 TCD.

    If you don't see the same thing, or have an owners manual (they are hard to find) Look up the possible causes for this, and let me know. If you know a message board that may help tell me too. I've looked, but haven't found.

    Thanks
     
  2. oldrustycars

    oldrustycars LawnSite Senior Member
    Posts: 301

    did this just start after the oil change? are you sure the correct weight oil was used? and some filters have an anti-drainback, so the filter stays full. if the replacement doies not have that, the oil pressure will stay low until the filter fills up. i dont know if your truck has that type of filter, but sometimes a cross referenced filter may screw on, but isnt the correct one. maybe try a genuine isuzu filter. is this a diesel? another thing to try is using a mechanical oil pressure gauge, and see what the pressure does. i dont trust those idiot lights.
     
  3. vntgrcr

    vntgrcr LawnSite Senior Member
    Posts: 282

    While we are on the subject of oil pressure, I just realized that my trucks sending unit is not hooked up to any wires. And there are none near it that have the correct connections on them. Can any of you provide me with the color of wire that is coming out of your wire loom that connects to your oil pressure sending unit on the pass.side of the engine near the flywheel. Thanks
     
  4. Ax Man

    Ax Man LawnSite Senior Member
    Posts: 446

    On my 93, 3.9 diesel a yellow wire comes off it about 2 inches then a connecter- switches to blue with red stripes before going into the harness.
    good luck!
     
  5. vntgrcr

    vntgrcr LawnSite Senior Member
    Posts: 282

    AX MAN,
    Thanks that is exactly what I needed. I appreciate your help.
    David
     
  6. Cheryl

    Cheryl LawnSite Member
    from Florida
    Posts: 95

    Oldrusty,

    No. The oil change had nothing to do with the problem. I had it before I did it. I thought I said that in my post, but apparently not clear enough.

    vntgrcr,

    Get your own post :rolleyes:

    Nobody's got a manual? It doesn't have to be from a 95.
     
  7. Lawn Masters

    Lawn Masters LawnSite Senior Member
    Posts: 850

    were it me, I'd be going ahead and putting a new aftermarket oil pressure sending unit and gauge in to read the actual pressure you're getting.
     
  8. Ax Man

    Ax Man LawnSite Senior Member
    Posts: 446

    Gee Cheryl,
    no need to get wound up.... One for all and all for one....
    My truck does the same thing, I think it just takes a little longer for the oil sender to get the message out. could be a dirty connection? wear?
    I guess if you are really worried you could go for the manual oil pressure guage, as rusty cars suggests.
     
  9. Cheryl

    Cheryl LawnSite Member
    from Florida
    Posts: 95

    I didn't say it in a bad way Ax. Anyway you had the answer for me. All I needed to know was if it happened on other trucks. I had a feeling it had to do with the delay in building oil pressure. A friend said the same thing. Like I said in the original post. I just never noticed it. Actually, I am paying more attention to my lights now (long story).
     
  10. oldrustycars

    oldrustycars LawnSite Senior Member
    Posts: 301

    i'd still install a proper oil pressure gauge. its very important, and can help detect trouble starting before it gets worse. good ones are less than 30 bucks. and i'd still try an OEM oil filter, just to see if it helps.
     

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