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Very low oil pump preasure

Isuzu 10 wheeler truck engine model 6 sd-1

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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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How to change oil pump on 1996 Isuzu rodeo


why?
tell full symptoms, i bet it not the pump.
which engine.2.2 or 3.2. there are 3 engine in USA. used
nothing stated.
ii pretend you said, 3.2
the FSM shows.

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove or disconnect the following:
    • Timing belt
    • Oil pan
    • Oil pickup tube
    • Oil filter adapter
    • Oil pump
all that and more, at alldata.com
but for Diagnosis, GEE< ask.
post SYMPTOMS> and get real answers.

there can be low or too much oil presssure.
low is most common, but is different
HOT?
cold?
and all rpm's.?
non of which was stated.
the #1 causes of low pressure ,is running the wrong oil viscosity.
if 10w-30 is in car, and low, the bearings are shot.
1 or all of them.

do you own a real oil pressure gauge, accurate. not some 5$ china
imported, trash?

Apr 08, 2014 | 1996 Isuzu Rodeo

Tip

Mack Fault Codes List


FAULT CODE IDENTIFICATION TABLE - VMACIII - 1998 & NEWER
1-1 Engine Oil Pressure Sensor
1-2 Barometric Pressure Sensor
1-3 Fuel Temperature Sensor
1-4 Ambient Air Temp Sensor
1-6 Starter Input
1-7 Engine Coolant Level
1-8 (ASET CEGR) Estimated % Fan Speed
1-10 Aux. Cooling Relay Output
2-1 Engine Coolant Temp Sensor
2-2 (ASET IEGR) Boost Air Pressure Sensor
2-2 (ASET CEGR) Boost Air Pressure
2-3 Intake Air Temp Sensor
2-4 Trans Oil Temp Sensor
2-5 Front Drive Axle Oil Temp Sensor
2-6 Rear Drive Axle Oil Temp Sensor
2-7 Engine Oil Temp Sensor
2-8 (ASET CEGR) Combustion Air Temperature
2-9 (ASET CEGR) Combustion Air Temp Sensor
3-1 Exhaust Temperature Sensor
3-2 Engine Speed Sensor
3-3 Redundant Engine Speed
3-4 Engine Position Sensor
3-5 Engine Brake Output #1
3-6 Engine Brake Output #2
3-8 Trans Splitter Position
3-10 (ASET CEGR) Engine Brake Output #3
4-1 Vehicle Speed Sensor (VSS)
4-2 Fan Clutch Output
4-3 Auxiliary Output #1
4-4 Auxiliary Output #2
4-5 (ASET IEGR) Wastegate Output
4-5 (ASET CEGR) VTG Position Sensor
4-6 Tachometer Output
4-7 Speedometer Output
4-8 Customer Defined Statement
4-9 (ASET CEGR) EGR Valve Mechanism
5-1 Throttle Position Sensor
5-2 Throttle Position Sensor Reference Voltage
5-3 Engine Shutdown Lamp/Alarm
5-5 Electronic Malfunction Lamp
5-6 Spare Relay #3
5-7 Engine Oil Level
5-8 (ASET CEGR) EGR Temperature
5-9 (ASET CEGR) EGR Mass Flow
6-1 Fuel Level
6-2 (ASET CEGR) Turbocharger Speed
6-3 J1708/J1587 Link
6-4 J1939 Link
6-5 All Communication Lost - Engine Shutdown
6-6 Fuel Control Module
6-7 Power Relay
6-8 J1939 Link
6-9 Other ECU Affecting Operation
7-1 Service Brake Switch
7-2 Parking Brake Switch
7-3 Speed Control SET Switch
7-4 Speed Control RESUME Switch
7-5 Battery / Alternator Voltage
7-6 Switched Voltage
7-7 Exhaust Temp Reference
7-9 VTG Actuator
8-1 Electronic Unit Pump #1
8-2 Electronic Unit Pump #2
8-3 Electronic Unit Pump #3
8-4 Electronic Unit Pump #4
8-5 Electronic Unit Pump #5
8-6 Electronic Unit Pump #6
8-9 Solenoid Boost Voltage
9-1 Transport Protocol
9-2 Power Reset Without Key Switch
9-3 (ASET CEGR) Aftercooler Outlet Temperature
9-5 (ASET CEGR) Compressor Discharge Temp
9-8 (ASET CEGR) Auxiliary Output Device #1
9-9 (ASET CEGR) Auxiliary Output Device #2
9-10 (ASET CEGR) Auxiliary Output Device #3
10-1 (ASET CEGR) Internal Sensor Voltage
10-2 (ASET CEGR) 5 Bolt Supply
10-3 (ASET CEGR) Sensor Supply Voltage #1
10-4 (ASET CEGR) Sensor Supply Voltage #2
10-5 (ASET CEGR) Fuel Filter Differential Pressure
10-6 (ASET CEGR) Fuel Delivery Pressure
10-7 (ASET CEGR) Odometer Save Area Failure
10-8 (ASET CEGR) GPS Position Data Not Received
10-9 (ASET CEGR) Watchdog Timer Reset


source

on Dec 20, 2016 | Cars & Trucks

1 Answer

Loss oil preasure in my 351 L


Sure sounds like stopped up return passageways, common in old engines. Or a failing oil pump, not common. Are you sure about this low mileage? Pull a valve cover and check for sludge.

Nov 26, 2013 | Cars & Trucks

2 Answers

Oil pressure drops to zero at idle on 2002 GMC Envoy after engine warms up


You could have three possable problems that I can think of. 1) Your oil viscosity is too low and you need to change it to a higher level. A 5w/30 or 10w/30 oil may thin out too much when it warms up to normal temp and shows low on your gauge. 2) The preasure relief valve is partially open due to a small piece of debris caught under the seat. Unscrew the oil filter and look at the small disk that is near the threded part on the filter base. Theres a spring behind it to keep it closed so all the oil goes into the engine and not bypass back into the oil pan. Push up on it slightly with a small tip screw driver and see that it fully seats in the hole, put a new filter on, and try it. 3) If these two things don't improve the condition, get a socket for taking the oil preasure sender off and get a oil preasure gauge to test the actual oil preasure the engine is producing. You may have a weak pump in the engine. If the preasure is within good specs, I'd change the sender unit with a new one.
Let me know what happened-
Craig

Jan 18, 2011 | 2002 GMC Envoy

1 Answer

What is the correct preasure of fuel pump for isuzu trooper II 1989 V6 american version


The engine is a GM 2.8L V-6 with TBI. Typical fuel pressure would be around 28 PSI.

Oct 07, 2010 | 1989 Isuzu Trooper

1 Answer

How much is oil pressure supposed to hold


10 lds at idle when cold but after buildup of preasure. This will change with oil temp. r.p.m. and engine wear. Low oil preasure is usually the result of engine wear but not a fault in an engine. If the oil light fliker's at idle when warm then the engine is excessavely worn and will soon cause problem's if the oil light stays out when warm at idle then its nothing to worry about.

Oct 11, 2009 | 1996 Isuzu Hombre

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

2 Answers

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 | Isuzu Trooper Cars & Trucks

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