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92 isuzu trooper rough / uneven idle

I can not find the problem Idle high after coming out of the freeway I hit the gas pedal and it goes down to a rough idle and uneven from 800 to 1500 rpm

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 8 Answers

SOURCE: 1992 isuzu trooper 3.2 DOHC

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.

Posted on Sep 19, 2008

  • 160 Answers

SOURCE: High Idle Problem

did you replace the iac motor or the tps , iac is the idle air control and the tps is the throttle position sensor

Posted on Nov 12, 2008

  • 1 Answer

SOURCE: 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.

Posted on Mar 06, 2009

  • 71 Answers

SOURCE: 92 chevy truck 5.7 idle revs up and down high emissions

sounds like a vacuum leak check hoses and manifold

Posted on Mar 28, 2009

  • 1 Answer

SOURCE: idle issues

I had the same problem and when I change the catalytic converter the problem was solve !

Posted on Apr 26, 2009

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2 Answers

I have 1999Chevy suburban with 6.5 turbo diesel motor.it idles up and down and when driving the gas pedal is real touchy Wat is the problem and were do i locate the problem


Check the help links related to this problem.Click the link below to go through its troubleshooting procedure :-----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html---------
Car won't start without hitting the gas pedal? http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
-------Complete loss of brake pedal then all gets normal? http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
------Car dies when gas pedal is pressed? http://schematicsdiagram.blogspot.com/2011/12/car-dies-when-gas-pedal-is-pressed.html
--------Pushing on the gas pedal, but the car slows down? Gas pedal to the floor and the car slows down?

http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html

---------

After replacing brake rotors and pads, brake pedal remains on floor? http://technoanswers.blogspot.in/2012/02/after-replacing-brake-rotors-and-pads.html

---------

accelerator pedal sensor? http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

-------

For rough idle issues and problem troubleshooting,go through the help links provided below :----- van idles rough?

http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html

---------
will not idle when cold?

http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html

----------
runs lean and idles rough?

http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

-----------
Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

------------
Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

----------
Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

---------
Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

----------
Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

------------
Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

------
While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------

This will help.

Thanks.

Mar 01, 2012 | 1999 GMC Suburban

1 Answer

Engine idles up when turn heater blower on


my idle up when turn on the ac and step the gas pedal with 1987 isuzu trooper ii.

Apr 05, 2011 | 1987 Isuzu Trooper

2 Answers

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


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.

Sep 05, 2010 | 1987 Isuzu Trooper

1 Answer

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

1 Answer

Idle issues


I had the same problem and when I change the catalytic converter the problem was solve !

Mar 25, 2009 | 1991 Isuzu Trooper

2 Answers

Check Engine light goes on and off


run a trouble code test to see what part is causing the check engine light to flash. I would lay my money on an O2 sensor.

Mar 10, 2009 | 1990 Isuzu Trooper

1 Answer

Unstable RPM - is this also a safety issue??


yes here is the common problem

Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Feb 15, 2009 | 2000 Isuzu Trooper

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

Idle speed too high


Look under the plastic intake tube for a hole

Nov 19, 2008 | 1990 Isuzu Trooper

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