Question about 1987 Isuzu Trooper

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How do you fix the idle on a 1990 isuzu trooper 4 cylinder, and where is the adjustment?

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My 1987 isuzu troper 2 idle is a up and down. I change new carborator, new rotor, new cap rotor, new spar plug and new spar plug wire. All vacuum hoses are being changed but still the idle are still the same. what is the problem why the idle is up and down.

Posted on Aug 07, 2011



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The idle screw is on the throttle body near where the gas pedal cable attaches to it. Not sure what sensors it has and less familiar with pre 90's cars but if it has an IAC or TPS could be causing problems. Clean the throttle body/carb.

Posted on Sep 05, 2010


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Isuzu V6 sparkplug firing order

gee guy, 3.1L or 3.2L?
you only need 3 things to time the distrib. static.
where is #1, its the most forward cylinder, LOOK carefully.
forward means closest to the cam drive end of engine.
not flywheel end.
rotor rotation direction (crank and watch it)
now the order, 3.2l v6? IS It? the single cam?
1990 trooper v6
answering for only USA car...
our 3.2 has no distrib V6 its DIS.

3.1L V6 USA spec. only. rotor is CCW

Sep 27, 2014 | 1990 Isuzu Trooper

1 Answer

How do you add motor oil to a 1990 isuzu trooper i've lost the manual so i dont know where the dipstick is.

First I have to know if it is a 6cyl or 4 cyl? If it is 6 cylinder then the dipstick is on the right side looking at the engine from the front. (figure 0-13). In(figure 0-10) in this link:
The oil fill is on the left side of the engine, and may either be a screw in or a plug type (though all the "official" parts depts. swear it is a screw in.
If it is a 4 cylinder, then I suggest you visit the myisuzuparts site to find the right places. I am sure you can purchase a new owner's manual there too.

Jan 08, 2011 | 1990 Isuzu Trooper

1 Answer

I have a 1990 Isuzu trooper i am wondering what is n line between the clutch master cylinder and the slave cylinder

You mean brake fluid?? There should be nothing in between the master and slave, unless you have a switch of some sort, but being that old, I doubt it. I really don't understand your question, but hope this helps.

Oct 17, 2010 | 1990 Isuzu Trooper

1 Answer

Engine is dying on idle

quick test , replace a piece of the fuel line with a clear plastic one, chaeck for air bubbles especially with less than half tank

Jul 28, 2010 | 1990 Isuzu Trooper

1 Answer

My 1990 isuzu trooper was driven to town when it started to heat up and miss a lot. No power on acceleration. Shop took compression test. # 1 piston 150 # 2 50 # 3-0- # 4.-0- I had the auto shop replace...

replacing the head gasket solved one problem.
But, you have a leakage problem with oil and/or antifreeze now.
The head gasket could be failing again, or you have a cracked block or cylinder head.

Take it back to where it was worked on and say that you want it fixed, please.

good luck on this.

Jun 20, 2010 | 1990 Isuzu Trooper

1 Answer

Difficulty to start early morning

I had the same problem, early morning rough idle. I changed the idol control sensor. Real easy part to change, usually about $100 for the part. My engine was teh 2.8 in 1990 Trooper. Hope it helps.

Jun 19, 2009 | 1990 Isuzu Trooper

2 Answers


Always a good place to start with tune-up. Also check Fuel Filter. minor restrictions can have major flow issues when incline is present. Hope this helps and have a good day.

Feb 03, 2009 | 1990 Isuzu Trooper

1 Answer

Idle speed too high

Look under the plastic intake tube for a hole

Nov 19, 2008 | 1990 Isuzu Trooper

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