Question about 1988 Isuzu Trooper 2 Door

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1988 isuzu trooper 4 cyl 4wd vibration

I took my dad's trooper to get smoged. was told the engine is in very good condition. all the tests passed with great specs. the car starts easy. idles well. but when you put it in gear and give it gas it starts to
shake. like it's missing. but the smog guy says the engine is good.
he suggested changing the fuel filter. where is the fuel filter located.
and if it's not the fuel filter what else do you recommend??

thanXoscar

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I actually have one of these myself that I drive daily! It is missing, several reasons for that, one plugs or wires, second these are notorius for headgasket problems and if it leaks can fould a plug. MIne did everytime it cooled down, but then after a few minutes it would dry out the plug and run ok. The wires and plugs would be my second check, the coolant level my first. These are great little cars and worth fixing in my opinion, I hope this helps you some, And Merry Christmas

Posted on Dec 23, 2008

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1990 Isuzu Trooper Flywheel needs to be resurfaced what should the step or the depth of the cup be? 2.6 Liter Engine 4Ze1


The Isuzu Amigo 2.6L 4 cyl , The Isuzu Trooper 2.6L 4 Cyl and the Honda Passport I believe with a 2.6L all have the same 4ZE1 2.6L 4 Cyl engine in them.

As per this page => http://www.automotix.net/autorepair/mazda-miata-engine_repair_guide-1772.html, found it looking for the same flywheel "cup" (aka we all call it a "step" but the machinists have a different flywheel that they call stepped so the one attached to the 4ZE1 is "Cupped") . Says the cut spec is .157"-.159" , so in this case the clutch pressure plate bolting surface is .157"-.159" higher then the center flat friction surface that the clutch disc sits in. (it doesn't indicate that it's inches or mm but I assume that because most usa machine shops use thousands of an inch calipers and micrometers it's more then likely inches).

Hope that helps you or anyone out there who needed that info :] .

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1 Answer

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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!

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1 Answer

1988 isuzu trooper, 2.6L, 4 cyl. I need to know how to test the CAS. I do believe mine is sick. Also, found about 2TBLspoons of engine oil when I took the dist. cap off. I'd like to know why. Thanks


The crank angle sensor has no individual testing procedure. Diagnosis is by verification of repair by replacing with known good component.

Check to see what the Diagnostic Trouble Codes from the ECM are. There are only one or two that directly relate to the CAS.

There is a small seal for the shaft of the CAS, where the drive gear passes through the body to drive the wheel. If this seal has failed, and at this age, it is possible, then the incoming oil has likely fouled the CAS, and is why the CAS won't work.

Unfortunately, there is no seal replacement. The only way to repair the CAS is to replace it.

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1 Answer

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The coolant temp. sensor is located under the intake manifold at the #1 intake port. It is not easy to access. Check the connector for corrosion.
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Oct 18, 2009 | 1988 Isuzu Trooper 2 Door

1 Answer

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1 Answer

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Firing order is stamped on the block intake manifold or label. 4 cyl are typically 1324

From the web:
The firing order for four cylinder engines where the cylinders are in-line is 1243 or 1342.
Those are the only two possibilities I've ever found for inline four cylinder engines. In practice, it's almost always 1342, except for Ford engines which are 1243.


Take one off at a time and replace it

Do not run the wires parallel (side-by-side) for more than 6". Cross them over each other wavy-like if needed. This will prevent crossfire.

Replace Points, Plugs, Condenser, Rotor and Cap too.

Good luck!

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One word... NOOOOOOOOOOOOOOOOOOOOOOO!!!!!!!!!!!!!!!!

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Just have your auto - locking hub cleaned and use your 4wd more often, it get stock usually for non usage. dont use grease after cleaning, use oil or thick silicone oil.

Dec 05, 2008 | 1988 Isuzu Trooper 2 Door

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