Question about 1993 Mitsubishi Diamante

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Idle speed adjustment

Hi I am trying to find out how to adjust the idle speed on a tr magna 2.6. Is it all set by the cpu and needs to be looked at by a dealer or is there a screw to adjust it

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  • ivy9797 May 24, 2009

    Hi the engine idle is too low I think it is the idle speed motor that needs replacement. Thanks I will keep looking for a solution.

  • ivy9797 May 26, 2009

    where do i find the iac is it the butterfly or somewhere else

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  • Mitsubishi Master
  • 1,348 Answers

The ecu drives a unit called an idle airspeed controller.if there is a vacuum leak,the computer will have the idle speed too high.
the IAC is a motor driven valve that controls airflow into the throttle body.it is common for idle speeds in the range of 1400rpm instead of 800 in this situation.
check the air filter,the throttle body cleaned,and the IAC has to be free moving.
also make sure that your coolant temperature sensor is accurate or the computer will think the engine is cold and keep the idle really high.

Posted on May 23, 2009

  • kirtec auto May 26, 2009

    the iac is also known for a too low idle speed.

  • kirtec auto Jun 16, 2009

    the iac is on the side of the throttle body.

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Posted on Jan 02, 2017

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How do you adjust idle speed 1991 johnson 100 hp


not important, what's important is that they are absolutely clean, including the four brass high speed jets located in the bottom center portion of the carburetor.

That model engine's carburetors has fixed jets, BUT if the slow speed jets are adjustable, earlier model carburetors have been installed. If so...................

The four adjustable needle valves control the flow of fuel in relation to the set air flow, adjusted as follows (if needed).

(Dual Carb V/4 With 4 (2 each carb) Slow Speed Adjustable N/Valves)
(J. Reeves)

The adjustment procedure of the carburetor slow speed needle valves follows. NOTE... if the needle valves turn too freely, replace the nylon bearing retainer (the nylon item at the front of the carb that the needle valve goes through first) with the newer type RED retainer #315232. If your engine has that weird linkage that connects all four of those needle valves, the newer RED retainers will enable you to discard that linkage. The RED retainers make it impossible for the needle valves to vibrate out of adjustment.

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Initial setting is: All (4) Slow speed valves = seat gently, then open 1-1/2 turns.

Facing the carburetors, start with the top left needle valve, then the top right valve, then the bottom let valve, then the bottom right valve. It may be necessary to redo these steps to get the adjustments ideally set

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Do not attempt to gradually adjust all four of the valves at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

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Most older cars had 2 adjustments , a air screw for enrichment and throttle screw for engine idle speed, later models did away with the enrichment screw, to adjust set idle screw to 600 rpm, adjust air mixture screw to fastest rpm , reset idle screw to preferred idle speed.

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idle is not adjustable Idle is control by IAC valve
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This should be set by the idle speed sensor but on some units there is an adjustment on the throttle cable stop. Have a mechanic do the job as if you upset the sensor settings too far the cpu will give you grief.. Normal idle will be about 900-1000rpm hot or about 1200 cold for a few minutes,

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