Have 2000 Ultra with power commander 1. Have magnetic injection. Have irattic idle. Changed IAC, no help. Have S&S ECM. Saw some videos where I can bypass power commander to see if problem stops. If it does then I need new ECM cause they don't make a power commander for it anymore. I also read that my bike will run with just one modification. I have Screaming eagle air cleaner and Rhinehart true duels. If I change air cleaner back to stock think it will run ok? Hate to spend 1k on new computer and more money to have bungs relocated on my exhaust for new ECM.

 

Try cleaning your throttle body. USE throttle body / throttle plate cleaner ONLY.
Might help.

 

... System is simple and adjustable when it's all Harley. Interesting with your aftermarket ECM.

Lot of good complete you tube videos on the complete blow by blow what does what .

No answer here but want to see an expert opinion. There here.

Part of the idle air is the butterfly stop factory set. Clean it like post two says but only carefully by hand. Don't speay. Anything you spray and disolve black crud washes in the IAC motor or temperature sensor.

That's what kills them. Not the spray. Done correctly, even carb cleaner is fine. Just don't spray.

With the IAC out, it's OK to spray port but only do it with a clean cotton cloth pushed in till it covers the port behind throttle plate. Normally, the port is always pretty clean anyway however

 

You report that:
You have a 2000 Ultra of unknown mileage and unknown ownership history.
Your bike has a Power Commander 1 fuel adder for the fuel injection. Unknown what map has been programmed into the Power Commander.
You report that bike has M & M fuel injection... Magneti Marelli
Motorcycle has an erratic idle...what exactly does that mean to you?
You changed the IAC, for some reason....did you test the other IAC first? The change provided no help.
Motorcycle has an S&S ECM for some reason. Unknown what has been programmed into the S & S ECM..
What happened to the original ECM?
You saw some videos where you can bypass power commander to see if problem stops. Note: Power Commander is a piggy back unit and can be disconnected and original connectors connected.
You report having Screaming eagle air cleaner and Rhinehart true duels.
Bike should idle and run fine with screaming eagle or factory air cleaner but a free flowing air cleaner will make bike run lean and hot so it should get extra fuel to make it not run lean beyond testing.
You should not buy anything yet....
What is condition of manifold seals? Unmeasured air can cause unusual air fuel mixture.. Seals eventually go bad, are inexpensive and you can hear a sucking noise when bad.
What is condition of fuel tank internals? is inside of tank clean? clogged fuel filter could alter fuel supply?
What is condition of engine temperature sensor? A bad temperature sensor can make idle flip/flop because bike thinks it is hot and cold and hot and cold.
What is condition of fuel line(s) under the tank? The two line M & M system leaks at the swivel after about 10 years and i believe there is a single line system that sometimes develops a connection issue as it enters tank that requires someone to push up on connector.

 

What was meant by irratic idle was turn key on goes to 2000 rpm, turn key off goes to 1000 rpm. Runs good for a day, week, month then turn key to start idle jumps to 2000 rpm. Throttle body cleaned, temp sensor replaced. IAC replaced and set to harley specs. Intake gaskets fine. S&S ECM was installed by dealership due to Harley discontinued for my year so S&S were the supplier at that time. I'm going to bypass the Power Commander and see what happens. My also remove air cleaner and replace stock unit to see how it runs.

 

I have no idea what you are saying in the first sentence. How can you turn key off and it goes to 1000 RPM.

Most bikes are turn key on. Crank till it starts. Cold idle maybe 1500 and as it warms quickly trims back to around 900 to 1000. All the FI seem to hunt about 50 to 75 RPM with the uneven firing not exactly 180 degrees apart.


Turn key or hit bar kill switch to off get 0 rpm.

 

OK. What I was saying is when the bike STARTS the idle will go to 2000rpm. I shut it OFF and restart it may go back to 2000 rpm or it may idle at 1000 rpm! How this helps.

 

Bike idle should be high at start and then settle down once warm.
Why was original ECM changed?
Was bike in a flood?
Have YOU personally reviewed both the throttle and idle cables. Both ends of each cable.
Is the throttle grip original factory grip?
Does throttle snap back when released or is it sticking?
If you answer questions asked then perhaps it will paint a clearer picture for others
Seems like some went unanswered.

 

Have you reviewed linkage at throttle body?
Any chance a linkage or bolt is loose?

 

Got it out of hibernation this morning. Took side covers off to bypass Power Commander and found out sometime last season with many technicians working on it, that the Power Commander was totally bypassed by one of them. I put the power commander back in, started the bike up and rpms went to 2k was back firing through tail pipes and it never came back down to 1k. Let the bike sit about 2 minutes and started it up again and bike went to about 900 rpm and no back firing.

Here's where it was bypassed