Any of you guys ever have a Power Commander take a crap? I took the 14 in to have the throttle bodies synced, new plugs and a new air filter because it seemed to be running a little off and it was time for that stuff anyway. I just sort of figured it was the throttle bodies but the guys said they were dead on, so they unhooked the pc and said the bike ran much smoother without it. I don't know if the thing is shot or maybe just reloading the map will get things straightened out. The only mods I've done is pulling the flies, do I really even need it? I was a tad concerned with a lean condition at low rpms without the flies and also was anticipating doing the exhaust.

Sounds like the PC is working. If it ran better with the PC out of the loop = WATT does that tell you? It says it is too rich running.

The thing to watch out for is low rpm, huge throttle yank up a grade. That scenario is to stay away from with subs out and no PC.

Other than that, I have not heard of others blowing the lean on the sub removal. I've always run without a piggy with sub shaft removed or with sub shaft tied open.

Neither made damaging effect to the engine. I do not smoke on start up. I do not hear a tick noise like a dual tick of piston skirts burned or scored that sound like a valve tick on the slap up or the slap down with skirt bang as that piston move process is as quiet as a mouse.

I question all the fallacy out there is apply and try = Tizz all BS Junk Science I tell ya!

4power, think back to when you first installed the PC and map. How did it run then? If it ran good before, then gradually began to run poorly, there is most likely somethng else amiss. The PC is a digital solid state device and as such it usually either works or it doesn't. I guess it is always possible your mapping has become corrupted or throttle point settings have drifted off target. Who did the original mapping for you, was it custom or one off of the DynoJet research website? I would reload the map and check your installation, pay particular attention to the ground at the coolant recovery reservoir. You said "it was running a little off". Can you describe what you mean by a little off? Did it seem to run rough at certain rpms or lack power at certain points of the rev range, throttle openings etc. It sounds like you covered the basics, TB synch, plugs and filter. How does it run now without the PC?

Kruz

I put the Power commander on myself and it came with the map for stock pipes flies out from dynojet. The bike ran perfectly smooth until the last 1000 or so miles. The on off throttle transition has has become a bit more abrupt, there's more buzz in the bars and pegs, the bike surges a little when trying to hold a steady speed and there's a bit of hesitation when rolling on the throttle. She just doesn't seem to be running quite as smoothly as she used to. It's not like it's running horrible but all things together get tiresome and annoying after an hour or so.

You will have to remove the hot side of the PC. Might want to save the map(s). Now with the PC out of the loop, you can tell if the bike is now the problem, not the PC.

I have seen a dead power commander on a coworker's FJR1300, but that one was totally dead, and needed to be unplugged for the bike to turn over.

I would start with the obvious: make sure the ground connection on power commander is still a good connection. Reset the power commander as per instructions from dynojet. Get the map reloaded into it. Make sure the connectors look normal with no loose pins in them. If all of the above is ok and power commander still creates a problem when connected, then chances are something internal to it is damaged.

Just my 2 cents.

Hi. I seem to have the same problem with rough running. Not something specific, but just not as smooth as it used to be. I have a full Arata system with a BMC filter, flies still in and otherwise stock. The PC was installed with a custom map and 'apparently' puts out 186.7 RW hp. I have my doubts about this, because a stock 2006 runs away from me up to max in 5 gear. Disturbing.

Harley, I would remove one unit at a time so you feel that 'smooth' part return again. Remember to remove the hot side of any piggy control box. If hot with ground off, she is still bleeding to ground using the injectors, as a ground source could possibly keep that smooth part you talked about from returning.

I remove the hot side just for this grounding reason = This tiny variable is in the loop, where you might chase your tail still looking for the cause.

* Last updated by: Hub on 5/27/2009 @ 5:53 AM *

Hi, Hub, thanks for the info.I am not too clued up on what you are saying. What do you mean by removing one unit at a time? I went on the PC web site and they suggested that the ground wire could be loose or incorrectly connected. This seems to be OK. I took my bike back to the shop that fitted it today, and he said that possibly the settings have gone 'out' Is this possible? Cheers.

What I meant by that, Harley is to undo your mods back to stock to see who started the bad running. No, that map is stuck in the numbers entered and only can they walk or be off the grid or, "OUT" to lunch are the wrenches that told you that.

That means not only can yours not walk off the grid... So can one more PC3/PC5 and did it? Not that I've heard. But you know those mechanics can make up some wild science that belong in the junk pile of the 5 tear ratio trash bin.

Here is another way of narrowing down that bad runner. What do you remember was the last mod that caused the bike to ((buzz)) away from smooth?

I think I got to to bottom of the rough running issues. The shop checked the throttle bodies and they were fine, they replaced the air filter and spark plugs and went for a ride. The bike still didn't run quite right so they unhooked the power commander and things smoothed out. I gave them the disc with the pc info on it and they "reloaded" the map and set the throttle position and that seems to have cured the problem. I rode it home from the shop today and it felt nice and smooth just like it used to. I guess for whatever reason the power commander got confused and needed an attitude adjustment. Yeah baby I'm back in business!