Question about 1988 Isuzu Trooper 2 Door

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Oil Pressure Problems on a 1988 Iszuzu Trooper

I have a 1988 trooper with a 4 cyl. when I first start the motor I have great oil pressure but after it warms up to operating temp it drops to nothing what can I do to fix this problem

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This engine is only the 4ZE1 2.6L EFI in the USA spec-models. The engine will run for a very long time with proper maintenance. Oil pressure falling only after warm-up indicates that the oil, when cold, is thick enough to make the pressure sending unit sense the oil. When it heats up the sending unit may not detect it as the oil thins out. The sending unit is what makes the gauge give an indicator its signal.

I would check the sending unit first, as your concern does not indicate a clattering engine or other problem. This model engine has a circuit that shorts the ignition to ground and kills the engine if the oil pressure ACTUALLY falls below a set minimum. Indicators of this problem are a loud clattering in the engine, as well an engine that will start and then stall for no reason.

Good luck!

Posted on Oct 09, 2010


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