Idle Adjustment

nope...the ECM is set to idle at a certain speed and unless it sees input from the apps it will idle at that speed.

now...someone with access to the software needed to change the ecm could prolly do it, but why would you want to?
 
you can try this---on the front of the APPS or TPS housing is a torx screw---it is frickin tight, so make sure you have the right size torx---you can back this screw out and see if it will reduce your idle(it may not reduce it all or it may reduce it a little, depending how it's set now) or you can screw it in to increase idle--this also adjusts the voltage, so if you get it out of parameters your truck will go into limp mode when you're driving and usually it happens fairly quickly, so be sure you can pull over and shut it off and then start it back up and turn the screw back until you were where you were at idle wise---you may need to play with it to find the limp mode point, which may or may not help you reduce the idle----chris
 
Unfortunatly, not easily. I have always wondered why these motors idle at 800-900 and other engines idle at 600.
 
getblown5.9 said:
nope...the ECM is set to idle at a certain speed and unless it sees input from the apps it will idle at that speed.

now...someone with access to the software needed to change the ecm could prolly do it, but why would you want to?
Click to expand...

I like the motors but hate the vibration & pulling against the brake so hard with a tight converter.The 12 valves do not vibrate like this does & just wanted to try to drop it 25 rpm at a time to see if it helps.Some diesels I have played with get worse some better. I saw the idle stop screw & does not look like any adjustment there.In the medium duty freightliners with this engine there is a idle switch on the dash where you can bump it 25 rpm at a time from 550 rpm to 1000 rpm.I wonder what it is hooked to??
 
that screw only lets you raise the idle, you can not drop it below 800...i tried
 
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