I just purchased a 2001 isuzs trooper. Not sure what the oil pressure is suppost to be. When I first start it and run it while it is cold the pressure is at 85 psi. After it warms up it drops to about 50 psi when driving and about 10psi at stops. Is this normal?
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Re: Oil pressure for 2001 isuzu trooper
I'd check to see what is in the crankcase currently; with modern multirange oils, that sounds high.
The typical operating range is from 30-60#; 10 seems low for an idle pressure but then idiot lights are supposed to trigger at ~ 4# pressure.
If it was mine, I would change oil and put a multirange type suitable for your area in it to see what influence it has.
If you are in a temperate climate as I am, it might be time to change from summer to a winter range; 10W30 is good for us and 10W40 in summer (WV).
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at cranking the oil pressure has to be approx 5 mPa before they start to work electrically also, oil pressure at rail varies from 4 to 28 mPa. on Tech2 scanner in data list rail oil pressure should be close to desired and when engine not running sensor should read 0 - 0.2 mPa if higher or a negative value when engine not running this indicates problem with rail oil pressure sensor which is a common problem.
The ECU will be fine with a engine rebuild but the 4JX takes a bit longer to start if all the injector oil paths are empty - can be up to 5 or 6 mins of 20 second cranking bursts.
Also if you rebuilt due to diesel in the oil from bad injectors the control valve for the injector oil pressure may be faulty so it wont start.
check oil pressure with test gauge from near large engine oil filter and cooler assembly, to rule out sender unit issue, if same readings check oil pick up sucking air O ring leaking?
releif valves in oil filter cooler assembly, stuck/jamming open?
if vehicle has been sitting for a couple of days and this happens light should only stay on 1-2 seconds go out and then gauge starts reading
have seen this on older higher km vehicles bad ones have balance shaft centre journal in sump worn out (new sump)