Idle Position Switch/Idle Stop Switch Adjustment

[JLR11]

Curtis, you can move this to tech articles if you think it would be better suited there.

Having a properly working IPS is critical to our 1G engines running properly at idle or coasting in/out of gear. The ecu looks at this signal to either cut fuel during certain conditions or add, I can't remember all the stuff it does but I know many people complain of problems while coasting in gear or other strange idle issues. If you haven't checked or performed a IPS adjustment this procedure could be the piece of the puzzle your missing.

*Make sure your throttle body has the ground strap connected to it or make one & ground it to a good source.

To adjust the switch: You loosen the lock nut on the switch, turn it all the way out counterclockwise. Make sure you loosen up the throttle cable as well. Get your meter & place it on a good ground with the positive lead on the switch, turn switch in (clockwise) unitil you get continuity, when it is constant turn the switch 15/16 of a turn clockwise, stop and tighten up the lock nut and your done. Make sure you tighten your throttle cable.

This procedure is outlined in the FSM (Factory Service Manual). Download it if you don't have it!!

[Autotalon]

Another way of doing this is to use your logger.

With the car running check the logger under the FLG2. If it is set correctly it will show the letter "I" when the throttle is closed. If not, adjust until it does. After you have made an adjustment check the TPS and adjust it to read ~10% at idle.

[2.3strokdtalon]

After you have made an adjustment check the TPS and adjust it to read ~10% at idle.

I came across this thread while searching for something else, but this statement caught my eye.

Why would you have to adjust the TPS to read 10% at idle?

[Autotalon]

That is the suggested position for it at idle.

[2.3strokdtalon]

That is the suggested position for it at idle.

Where is this suggested from?

[Autotalon]

I can't remember specifically, but I think it was busta from the old forum. besides, if you follow the vfaq way to set it by voltage of .48-.52v it works out to about 10% on the logger.

[hakcenter]

5v * 0.1 = 0.5v = 10%

[JLR11]

That is the suggested position for it at idle.

Where is this suggested from?

Directly from the Mitsubishi Factory Service Manual (FSM) which calls out .48-.52V=10% TPS.