Question about Isuzu Trooper

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Very low oil pump preasure

Cargo truck 10 wheeler

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  • mbarnes00 Jan 06, 2009

    i have an 04 ascender with 4.2 v6 and the oil pressure will drop to nothing but the motor runs fine if i shut it off and start it back up the oil pressure is fine i assume sending unit.

  • Anonymous Jan 11, 2009

    i changed the oil on my '05 trooper and now the oil pressure won't build up

  • Anonymous Mar 28, 2009

    .dfgsddh


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Hi Noby!

I gather from your multiple posts with the same problem that you weren't able to locate an Isuzu cargo truck in the "Add Specific product" window... but I'm assuming you have one with diesel engine and your problem is a low oil pressure indication.

First, you need to make sure there is the proper amount of oil in the crankcase... so check the oil, add if needed, then see if the problem persists.

If so, verify that there actually is a low il pressure condition and this is not just a faulty indication. If you have a mechanical oil pressure gauge, we'll assume it is accurate... but if it is electrical, you will need to obtain a service pressure gauge. When you have this, remove the oil pressure sending unit from the engine block, and with the right adapters, fit the service gauge to the sending unit hole... then check the oil pressure situation with the more accurate service gauge. Note if the low oil pressure is only at idle, or if it persists throughout the RPM range.

If the low oil pressure clears at RPM, you probably have a problem in the oil pump (worn) or oil pressure relief valve (stuck), but that is usually a part of the pump assembly.

If the low oil pressure is persistent throughout the RPM range, the possible causes still include the pump but also take in loose crankshaft main or rod bearings or possibly an internal leak in the pressurized oil galley circuit, such as a lost galley plug (metal plug used to close the hole where the internal oil passage was machined/drilled). And there are other possibilities...

A temporary help with this problem is to go to a higher viscosity (thicker) oil, and do a filter change when the oil is changed. The thicker oil does not escape loose bearing fits as easily, thus helping build pressure.

Hope this is illuminating and helpful, and good luck with the problem. Do not hesitate to post further questions or comments an let us know how it goes...

Thanks!
WildBill

Posted on Jun 18, 2008

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94 rodeo has low oil pressure at idle with a slight engine tick. Previous owner did not change oil in sometime. Will a oil change possible cure this problem or will it help with the trouble shooting?

Posted on Feb 14, 2010

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1 Answer

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Go back to where you got the work done if you can.If not then i would get the oil preasure checked as the low light tells me the preasure is below 8 psi and the ticking is from the lash adjustors at the tappets verifys low preasure too.

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Let me know what happened-
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1 Answer

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your engine is worn out if the oil pump is gone. it is 21 years old. you can spend a grand getting a lower mileage engine and install it, or you can spend the same money and get a vehicle 10 years newer.

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Will a low oil level warning cause the engine to quit on a 1995 chevy caprice


It could, once the engine is running it then keeps the fuelpump running with the oil preasure switch and if the oil preasure drops it can stop the pump,but should start back up unless theres a bad fuelpump relay,

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1 Answer

E2200 oil light comes on when cold then goes off after warmed up. The oil level is good


try replacing oil preasure switch, if light still comes on then have oil preasure checked , (when cold) may need oil pump if presure is low, if you caught problem early you wont do any engine damage, again start with the switch .hope this helps.

Oct 15, 2009 | 1988 Mazda B2200

2 Answers

I have a 1998 Jeep Cherokee with a 4.0L engine. The oil pressure gauge usually stays around 40 on the highway but when I come to a stop it drops down to 10. Is this normal or is my oil pump getting ready...


No this is normal. As an engine wears then oil preasure will be less this is not due to a weak oil pump but wear in crank shaft bearing's. When an engine is new and bearings are tight then oil preasure wont fall a lot from reved up to idle as the engine wear's oil escapes quicker from the crank shaft bearings. Reved up oil preasure increases idle it drops off. If the oil light stays out then their is enough preasure to lubricate the engine. In fact in an older engine high oil preasure is a worse complaint as this means the oil system is clogging. All is ok with your pump. If the oil preasure is moving up and down at constant rev.'s then the oil pump is faulty. Hope this put's your mind to rest.

Aug 11, 2009 | 1998 Jeep Cherokee

2 Answers

Oil light flashing occasionally


It could be a faulty oil sending unit, but it would be advisable to have the oil preasure checked with a mechanical guage to determine if it is a sending unit or low oil preasure. Oil preasure low enough to allow the light to come on is low enough to possibly cause major engine damage.

Jul 06, 2009 | 1995 Toyota Previa

1 Answer

Low oil preasure all of a sudden but has plenty of oil in engine end oil warning light comes on frightened to use car now


it could be your oil preasure senser. if not that it sound like a bad oil pump. not good

Mar 22, 2009 | 1995 Jaguar XJ6

1 Answer

Very low oil pump preasure


Hi Noby!

I gather from your multiple posts with the same problem that you weren't able to locate an Isuzu cargo truck in the "Add Specific product" window... but I'm assuming you have one with diesel engine and your problem is a low oil pressure indication.

First, you need to make sure there is the proper amount of oil in the crankcase... so check the oil, add if needed, then see if the problem persists.

If so, verify that there actually is a low il pressure condition and this is not just a faulty indication. If you have a mechanical oil pressure gauge, we'll assume it is accurate... but if it is electrical, you will need to obtain a service pressure gauge. When you have this, remove the oil pressure sending unit from the engine block, and with the right adapters, fit the service gauge to the sending unit hole... then check the oil pressure situation with the more accurate service gauge. Note if the low oil pressure is only at idle, or if it persists throughout the RPM range.

If the low oil pressure clears at RPM, you probably have a problem in the oil pump (worn) or oil pressure relief valve (stuck), but that is usually a part of the pump assembly.

If the low oil pressure is persistent throughout the RPM range, the possible causes still include the pump but also take in loose crankshaft main or rod bearings or possibly an internal leak in the pressurized oil galley circuit, such as a lost galley plug (metal plug used to close the hole where the internal oil passage was machined/drilled). And there are other possibilities...

A temporary help with this problem is to go to a higher viscosity (thicker) oil, and do a filter change when the oil is changed. The thicker oil does not escape loose bearing fits as easily, thus helping build pressure.

Hope this is illuminating and helpful, and good luck with the problem. Do not hesitate to post further questions or comments an let us know how it goes...

Thanks!
WildBill

Jun 18, 2008 | 1985 Chevrolet Camaro

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