Question about 1993 Isuzu Trooper

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93 trooper idles high then check engine light comes on then idles down

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  • kgenejen13 May 11, 2009

    it has new 02 sensor

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There is a sensor in your car telling your computer to light up your check engine light. When your car drives okay it is usally associated with a faulty switch or sensor. Probably oxygen sensor

Posted on May 11, 2009

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1 Answer

High idle


Did you smoke test it to determine no vacuum leaks?

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I have a 93 honda del sol manual when the car has been turned on it accelerates by itself and it has a check engine light dont now what is wrong with it


You probably have a bad Idle Air Control Valve (IACV). In fuel injected carburetors when the throttle valve is closed the IACV opens and closes to control the idle speed. If it malfunctions the engine may rev up allowing the car if in gear to accelerate on its own . When I had a bad IACV in my Mitsubishi Lancer it would drive down the road at 50 mph with out touching the gas pedal. Fortunately, it could be slowed down by using the brakes (unlike the Toyota stories).

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1999 isuzu rodeo LS: Revs high sometimes then revs low to the point it stalls. goes back and forth , won't maintain a level idle. I have to press the gas pedal so it won't stall, so either im stalling at a...


Do you have a check engine light? Which engine? My 1996 Trooper with a 3.2 D.O.H.C. is awful for plugging up the E.G.R. I have cleaned it several times! Good Luck!

Mar 21, 2010 | 1999 Isuzu Rodeo

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Headlights out


You need to change the head light bulbs, they have two elements one for normal lighting and one for high beams, the low beam elements on those light bulbs are burnt, install new ones and you'll fine. Good Luck

Feb 08, 2010 | 1993 Isuzu Trooper

3 Answers

Engine idle speed too fast some times. idle speed


Three things to check for:

1) High idle switch is on..*(vehicle thinks AC is running but it isn't.
You can try turning on the AC and see if the engine slows down to confirm this one.

2) Sticking or worn out Idle Air Control or IAC, You might get a check engine light with this one.....you might not if it's a mechanical failure.

3) Simplest of all. A vacuum leak. You can get the engine vacuum read while running if you go to a mechanic with a vacuum guage or an OBD 2 ecu code reader. There should be specs on what vacuum levels are normal for you car at idle.

Good luck and be careful!

Dec 29, 2009 | 1996 Isuzu Trooper

1 Answer

My 93 trooper has hazard lights but no turn


check the multifunction switch on the column!

Aug 01, 2009 | 1993 Isuzu Trooper

1 Answer

Idles too high.


most likely a sticking idle air control motor.It is the round log solenoid bolted on the side of the throttle body. Try tapping it with a hammer first to see if this un-sticks it. If so this is your problem and replace it.

Mar 16, 2009 | 1993 Ford Thunderbird

3 Answers

98 Isuzu Trooper stalls on cold start, idle issues..


I had the same issue on my 99 Trooper.

It would usually start when completely cold, but idle around 2k RPM.
It would drive fine. But if I shut it down, ran into a store, and came back out, it would start but immediately idle.
Had to ride the gas a little to get it into gear.
The Check Engine light has been going on and off for 6 months or so.

I took this to my local trusted repair shop (no Isuzu dealers within 200 miles).
The diagnosed the light, and found that the Intake Gaskets were bad or leaking.
The idling problem was related to the car not being able to control the amount of air coming in.

They replaced the Intake gaskets by the next day, and I haven't had a problem since. And no more check engine light, which has been on half a year.

Here's some details from my bill:
(1) Intake Gasket set $107.95
Misc materials $21.00
2.1 hours of Labor

The total cost to me was $345.00, and I definately don't feel gipped.

Jan 06, 2009 | 1999 Isuzu Trooper

1 Answer

High idle with a/c on.


Cars are SUPPOSE to idle higher when the A/C is on...(especially 134a systems)..the idle will go up and down as the compressor cycles on and off.

Sep 17, 2008 | 1999 Chevrolet Suburban

1 Answer

1992 isuzu trooper 3.2 DOHC 4X4 LOW IDLE GOES UP AND DOWN 750 RPM TO 1500 RPM


I had the same trouble with my 93 Trooper.

I went on a sensor-changing spree.

The one sensor that fixed this idle problem was the throttle position sensor.

You can get one here.

Throttle Position Sensor

It's very easy to change, and fixes the problem instantly.

Good luck.

Jul 22, 2008 | 1993 Isuzu Trooper

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