Question about 1990 Isuzu Trooper

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Low oil presure 2.8 v6 GM

Is there an oil pressure relief valve on this engine and if so where is it?

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How to tell if oil pump is starting to go out?


1. Engine Noise. With a bad oil pump sufficient engine oil will not get to all parts of the engine, especially the top end, and you will get engine noise with metal parts that would normally be lubricated and quiet knocking due to metal to metal contact. Engines with hydraulic lifters that become noisy can be a sign that they have insufficient oil supply. In addition to the hydraulic lifters, your valve train may begin to make noise if your oil pump begins to fail. Valve train components need to be properly lubricated as well. A bad oil pump can result in a lot of additional noise from your valve train system.

2. Higher engine temperature. Poor lubrication because of poor oil flow generated from the pump will cause friction in the engine and the engine temperature will rise. Good oil flow is essential for lubrication and reducing friction to a minimum.

3. Low oil pressure. The oil pump generates oil flow through the engine but tolerances between metal parts produce the oil pressure. Very worn engine bearings will result in low oil pressure. Thus a worn engine will have low oil pressure even though the oil pump may be fine and there is no issue with the oil pressure relief valve either. However you will also experience low oil pressure due to a failing oil pump because poor oil flow will also result in lower oil pressure.

If your oil pressure warning light has been triggered in your engine, the causes of the low pressure need to be properly investigated because the problem may not be with the oil pump. People replace oil pumps assuming that is always the problem and then still have low oil pressure because the pump was not the problem to begin with.

Dec 05, 2015 | Cars & Trucks

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How do I determine if my 2003 Lincoln LS has a rain sensor using the vin number


A few reasons , low on oil , faulty oil pump relief valve , faulty sender unit. Remove the oil sender unit fit a gauge, start engine and check oil pressure if ok replace sender unit . If still low check oil pump pick up strainer and relief valve spring.

Apr 28, 2015 | Lincoln Cars & Trucks

2 Answers

Where is my fuel pressure test valve?


On the fuel rail that surrounds the plenum in the front. There should be a black screw on cap covering it.

Mar 14, 2015 | 2001 Buick Century

1 Answer

Low oil pressure at idle 2008 cadillac escalade ext


if its low on an independent pressure gage then you could have worn engine bearings or a bad oil pump, pressure relief valve stuck open lowering oil pressure.

Aug 29, 2014 | 2008 Cadillac Escalade Ext

1 Answer

Low presure oil


first thing check is the engine oil level.if oil level okay check oil pressure should be for the 4.2 engine oil pressure should be 12 psi @ 1200 rpm for the 5.3 oil pressure should be 18 psi @ 2000 rpm if oil pressure good problem in the oil pressure sending unit. if oil pressure is low problem faulty oil pump or worn crankshaft bearings if oil pressure low engine will have rod knock.make sure you are using correct oil viscosity if oil too thick you will have low oil pressure oil too thin you will loose oil pressure.

Nov 26, 2012 | 2004 GMC Envoy

1 Answer

Oil presure guage jumps from 30 to 60 whats the normal operating range


Oil pressure should be around 30 at idle and then sit at 60 when engine is above 2,000 RPM. If pressure varies at all engine speeds it indicates a sticking pressure relief valve which is located within the oil pump. You could try using some oil flushing product in the engine oil before the next oil change to see if it removes the gunk that is causing the valve to stick. If that does not improve it you should see a mechanic about replacing the relief valve.

Sep 29, 2010 | 1993 GMC Suburban

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Low oil presure only in the morrning for about 2 min. at the same time motor is running fine, but showing no oil presure, then gauge go's to normal. Motor still running fine! Could it be a pressure...


Ok filter problem could be there filters that have a valve used to chek the oil gallery is not downloaded and so when the engine begins to work up the pressure quickly. Also in other systems, this valve is fitted in the pump aceite.thanks good luck

Jan 13, 2010 | 2002 Mercury Mountaineer

1 Answer

Low oil presure on gmc 5.3 manual gauge shows 0 psi at idle 20 psi driveing


Oh my!! I'm guessing the "oil pressure relief valve" is stuck open. Does the motor sound OK no knocking or ticking? The "oil pressure relief valve" is built into the oil pump.

Jan 03, 2010 | 2002 GMC Sierra C/K1500

1 Answer

1993 Jeep Grand Cherokee, V6. Oil Pressure Gauge Read High.


it could be the sensor you should look at the oil pressure relief valve

Jun 10, 2009 | 1994 Jeep Cherokee

1 Answer

Location of Oil Pressure Sensor and Oil Pressure Relieve Valve


the oil pressure switch is on pssenger side, lower engine area,beside oil filter, mounted in engine block. The pressure relief valve is in the oil pump, in which case, you have to drop the oil pan,and take off the oil pump.

Jan 31, 2009 | 1989 Toyota Land Cruiser

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