I'm new to Harleys. I just got an '01 EGC with EFI. I don't know if it is running well or not. It does have aftermarket exhaust and air filter. I know it doesn't have a power commander or anything like that. I don't know if it has the HD download. Here is what I am experiencing:

-MPG tops out at 38
-It smells like it is running rich (maybe that is normal for HD)
-When engine gets hot, lately it has been idlling at about 600-800 RPMs (feels like it is going to die)
-Lots of popping and backfiring when decelerating
-Every once in awhile it sounds like a cylinder doesn't fire (just sounds like a puff of air coming from under the tank)

Any thoughts, suggestions would be greatly appreciated.
Thanks!

 

I hope this input helps a little.

 

This happens at random. Not real often. Maybe once or twice a day. Engine can be hot or cold.

I think its doing it when the engine is coming from idle to a load

Sometimes it will do this when I start it too.

 

MM systems are notorious for eating ISC (Idle Speed Controllers), ET (Engine Temperature Sensor), and improperly set idle (Hot and Cold).....

FWIW, you should get the bike to a shop that has the ability to hook up to a computer and evaluate the data stream for anomolies....

 

Don't ask me how, but I got the bike to do this again and it actually did it a few times. It felt like my old bike did when it ran out of gas and I had to switch to the reserve tank. It only stuttered for a few seconds, then went back to normal.

 

I guess what I'm trying to figure out is if I should try installing a fuel management system (Power Commander, Fuelpak, etc) before taking it into the shop to look for some problems...

She finally did die on my today at a stoplight.

 

I had that missing and dying issue and when I checked my plugs one was out of whack. Got a new plug set the gap and good to go. Try checking the plugs and are you running Hi octane gas?
Buzz

 

Brand new plugs and 91-93 octane (non oxygenated if I can help it.)
This bike only has 8000 miles on it.

 

Check what Shouvehead Bob pointed out.
Start with the Idel Air Controler. Sounds like it is not doing it's job.

 

Okay here's whats going on now: 2 days ago I adjusted spark plug gap from .040 to .043. Then I adjusted the hot engine idle speed and pulled the 5 and 15 amp fuses on the right side.
After doing that she ran beautifully. No backfire, no dying, no misfire.

Fast-forward to today. Started it up and within 5 minutes of idling in the driveway it died. Its idling at about 600-700rpms cold. (I don't know if it's actually misfiring maybe someone could educate me on how to tell) But it was stuttering again today and a little backfire. Not as much as before though. What gives?

On a side note, I washed the bike yesterday. That's the only thing that happened between the two "test drives"