Now what's wrong with my oil gauge?

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Thread: Now what's wrong with my oil gauge?

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    Default Now what's wrong with my oil gauge?

    I own a 2000 tundra 4.7 and today on the way back from school i notice the oil pressure gauge sat on low so i pulled to the side of the road and shut it off then started it think maybe its just something to do with the gauge but all it did after i started was go half way then started falling back down to low so then i jump out and checked the oil while it was running and it showed the oil was up to the second dot on the dip stick, I got no clue what's going on with it. Anything i should check or do?

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    Default Re: Now what's wrong with my oil gauge?

    When you say it is "low" do you mean to the quarter mark on the gauge? If so then this is normal. The oil gauge typically peaks out at a little just over the halfway mark and then settles in around the quarter mark while driving. If it dips below the quarter mark while driving then you may have cause for concern.
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    Default Re: Now what's wrong with my oil gauge?

    My gauge will settle to the 1/4 mark at warm idle, and will rise up into the 3/4 mark range when on the throttle/at speed.

    This is typical of and normal for crank-driven oil pumps.
    Last edited by Remmy700P; 01-09-2012 at 12:55 PM.
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    Default Re: Now what's wrong with my oil gauge?

    it sits below 1/4 and doesn't go up when i rev it, i got 0-30w amsoil in it but that was about 3,000 miles ago

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    Default Re: Now what's wrong with my oil gauge?

    OK. If oil voume isn't a factor, then there's a problem either with the sending unit or the gauge itself.
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    Default Re: Now what's wrong with my oil gauge?

    if i did have low oil pressure wouldn't a light come too telling me to check engine. i just want to make sure i can still drive it to school.

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    Default Re: Now what's wrong with my oil gauge?

    you would have known by now if there was a problem with low oil volume or pressure.
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    Default Re: Now what's wrong with my oil gauge?

    so then i jump out and checked the oil while it was running and it showed the oil was up to the second dot on the dip stick, I got no clue what's going on with it. Anything i should check or do?
    First thing to do is turn off your engine then check it after it sits for a few minutes. You won't get the correct reading while it's running.
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    Default Re: Now what's wrong with my oil gauge?

    yeah i check it again last night when it sat for about 3hrs and oil was just above the 2nd dot

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    Default Re: Now what's wrong with my oil gauge?

    stop worrying if it stays there.
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    Default Re: Now what's wrong with my oil gauge?

    Normal oil pressure for a Tundra is min 5 at idle and min 45 at 3K RPM. In my experience the gauges are very reliable and the sending units less so. New senders cost about $45. IIRC the sender is located near the oil filter at the driver side front of the engine. Check for leaks. If you can get a mechanical gauge that's the best way to check the pressure. If not try disconnecting the wire and see if gauge reads zero. Now ground the wire to the block and it should read max. If so replace the sender. If not check your wire for a break or ground. Report your findings.

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    Default Re: Now what's wrong with my oil gauge?

    bfunke is right in that you will only know what your actual pressure readings are with a mechanical guage. Pull the sender unit and connect a fitting/hose/guage setup.
    My 4.7 shows around 1/4 at hot idle and a little over 3/4 at 2000 rpm hot. It has always done exactly that for 10 years, but i have no idea what the actual pressure is. Essentially it is an idiot guage, but is way better than the idiot light concept. Gotta wonder about the bozo that thought up the 2psi idiot light !
    I would be surprised at the low end spec of 5psi that bfunke mentions though ! Is this correct guys?

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    Default Re: Now what's wrong with my oil gauge?

    Its the 0-30 oil. I put 5-30 in my 04 rather than the 10-30 recommended and the gauge showed thesame thing (low).

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    Default Re: Now what's wrong with my oil gauge?

    Quote Originally Posted by Cray49a View Post
    Its the 0-30 oil. I put 5-30 in my 04 rather than the 10-30 recommended and the gauge showed thesame thing (low).
    Don't see how oil viscosity could be the culprit. A 0W-30 and 5W-30 are the same viscosity at operating temp. Even cold, they are similar enough that an analog gauge isn't going to reflect the difference.
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    Default Re: Now what's wrong with my oil gauge?

    Quote Originally Posted by Remmy700P View Post
    Don't see how oil viscosity could be the culprit. A 0W-30 and 5W-30 are the same viscosity at operating temp. Even cold, they are similar enough that an analog gauge isn't going to reflect the difference.
    I've been blown off twice from replying. Here goes. Only happened when I went to 5-30 and never with 10-30. Weird.

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