Question about Toyota 4Runner

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On a 1993 Toyota 4runner 6cyc the dashboard oil gauge reads low pressure when idling although the dip stick is showing full. Replacing the oil pressure sensor did not resolve the issue. The vehicle was manufactured in 02/93.

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  • William Erickson Mar 13, 2011

    The engine has 195,582 miles on it so it is probably is a little worn, and it just carried a heavy load all the way from Seattle to Tucson.



    Had a oil filter change just before the trip.



    It

    The engine has 195,582 miles on it so it is probably is a little worn, and it just carried a heavy load all the way from Seattle to Tucson.


    Had a oil filter change just before the trip.


    It

  • William Erickson Mar 13, 2011

    Thanks you're response, and yes I would like instructions for replacing the oil pump.

  • William Erickson Mar 13, 2011

    Thanks - it is a 4wd and sure lookes like a lot of work to change the oil pump. The engiine is running good with no loss of power or noises, so think I'll just leave well enough alone. You've been a great help and thanks for your knowledge.



    Bill

  • William Erickson Mar 13, 2011

    Yes the solution was helpful.

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You can remove the oil pressure sensor and use a test pressure guage to read the pressure. This gives you more or less a second opinion. I dont know what reading is being considered "Low". What is it reading? Do you have the "dummy light", pressure guage or electronic pressure guage? Have you changed the oil and filter then compared the new and old readings? What type of oil are you using?

It is very possible that there could be wear on your oil pump or even a washer failure where the pump mount is.

Has this been gradually getting worse or did it happen all of a sudden?

Posted on Mar 13, 2011

  • Joseph Midjette Sr.
    Joseph Midjette Sr. Mar 13, 2011

    I would also like to add that if you have any mechanical inclination, you can do repairs such as oil pump replacements. Just buy a Haynes or Chilton repair manual for your vehicle, (they are usually around $25 and well worth it) and you can do it!

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Hi, there are a couple of things that can cause low oil pressure at idle. One is a worn out engine and the other is a worn out oil pump. If you have over 200K miles on the truck, it may be time to rebuild the engine. You can try just replacing the oil pump, but it might not solve the problem. If you would like instructions for replacing the oil pump or have any other questions, please reply; and thanks for using FixYa.

Posted on Mar 13, 2011

  • Jeff Turcotte
    Jeff Turcotte Mar 13, 2011

    If you have 4WD, it's a real pain. Below is the procedure from Autozone.com. By the way, there is little harm in low oil pressure at idle, so there is no hurry in doing this.



    3VZ-E Engine

    See Figures 3, 4 and 5



    1. Raise and support the vehicle.

    2. Remove the engine under cover.

    3. Remove the front differential.

    4. Drain the oil.

    5. Remove the timing belt.

    6. Remove the crankshaft timing pulley.

    7. Raise the engine slightly and remove the oil pan.




    Fig. Fig. 3: Exploded view of the oil pump components on the 3VZ-E engine




    1. Remove the two bolts and nuts; remove the oil strainer and gasket.

    2. Insert a drift between the cylinder block and the oil pan baffle plate, cut off the sealer and remove the baffle plate.

    When removing the baffle plate with the drift, do not damage the baffle plate flange.



    1. Remove the seven bolts, then the oil pump and O-ring. If the pump is difficult to remove, use a small plastic mallet to carefully tap the body of the oil pump.

    To install:

    Pack petroleum jelly between the oil pump gears. This will prime the pump during initial startup.



    1. Apply sealer to the oil pump mating surface, running the bead on the inside of the bolt holes. Position a new O-ring in the groove in the cylinder block and install the pump so that the spline teeth of the drive gear engage the large teeth on the crankshaft. Tighten the mounting bolts to 14 ft. lbs. (20 Nm).





    Fig. Fig. 4: Do not apply too much sealant on the pump surface, it can block the oil passage





    Fig. Fig. 5: Align the pump drive and the pump




    1. Remove any old sealer on the baffle plate and block surfaces. If solvent is used, make sure it does not affect the paint. Dry the surfaces completely. Apply sealant in a 0.1 in. (3mm) bead around the baffle. Run the bead to the inside of the bolt holes and avoid excess sealant.

    2. Install the baffle plate.

    3. Install the oil strainer and tighten the bolts to 61 inch lbs. (7 Nm).

    4. Install the oil pan.

    5. Install the crankshaft pulley.

    6. Install the timing belt.

    7. Install the front differential and the undercover.

    8. Lower the vehicle.

    9. Fill the engine with oil and check for leaks.

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