power commander ?
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Joined: Feb 2005
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I bought a PC V & A/c for my Ultra back in Feb, but still have not installed it. The bike runs so damn good and gets great mileage the way it is, I'm having a hard time justifying installing them. Not to mention the old PCIII died on my Night Train about the same time I bought the PC V for the Ultra, it kind of has me spooked.
I know if the PC V dies I can just unplug it, but what will happen if I have the O2 sensors from the auto tune installed? Will the ECM read them correctly with the PC V unplugged?
I know if the PC V dies I can just unplug it, but what will happen if I have the O2 sensors from the auto tune installed? Will the ECM read them correctly with the PC V unplugged?
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Joined: Dec 2007
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From: Lake City, Florida (Native)
I bought a PC V & A/c for my Ultra back in Feb, but still have not installed it. The bike runs so damn good and gets great mileage the way it is, I'm having a hard time justifying installing them. Not to mention the old PCIII died on my Night Train about the same time I bought the PC V for the Ultra, it kind of has me spooked.
I know if the PC V dies I can just unplug it, but what will happen if I have the O2 sensors from the auto tune installed? Will the ECM read them correctly with the PC V unplugged?
I know if the PC V dies I can just unplug it, but what will happen if I have the O2 sensors from the auto tune installed? Will the ECM read them correctly with the PC V unplugged?
senior experienced all-knowing leader of the unwise
Joined: Apr 2008
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From: USA
Seems to me like if a PC V failed with the autotune(i have one), since O2 sensor elimators are installed on the stock harness it would go into default rich mode and would still be OK until you could get it fixed. Good question though. I unplugged a PC III and the bike still ran with the stock ECM, just not very good.
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Joined: Sep 2005
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From: Baton Rouge, LA
For the benefit of others who may be faced with lower mileage with the FM package, you don't need a dyno tune to improve it. Merely leaning the cruise range will make a noticeable difference without affecting roll-on or WOT performance. This is a simple procedure that can be done by the owner using the supplied software.
Another option mentioned by Luc.who is the Auto-Tune kit, which for $300 will tune AFR's on the fly throughout the RPM and TP range (Note: DJ recommends no AT at 0% TP.)
Another option mentioned by Luc.who is the Auto-Tune kit, which for $300 will tune AFR's on the fly throughout the RPM and TP range (Note: DJ recommends no AT at 0% TP.)
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Joined: Sep 2005
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From: Baton Rouge, LA
The PCV is not likely to die, but if it does with AT installed you needn't do more than simply bypass the PCV and re-connect like stock. The ECU doesn't know the PCV's wide-band O2 sensors are in-line with the PCV either connected or disconnected, and with the O2-sensor eliminators installed the bike will run directly from the ECU just like stock except in open-loop mode. This won't hurt anything except that WOT performance won't be optimal and the majority of the RPM range will be leaner than it likely was with the PCV installed.
Last edited by iclick; Jul 14, 2009 at 12:44 PM.
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
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From: Baton Rouge, LA
Seems to me like if a PC V failed with the autotune(i have one), since O2 sensor elimators are installed on the stock harness it would go into default rich mode and would still be OK until you could get it fixed. Good question though. I unplugged a PC III and the bike still ran with the stock ECM, just not very good.
If my PCV fails while AT is installed I would simply bypass the PCV and run from the ECU, then deal with it ASAP when I'm back home. BTW, it may not be advisable to run too long with the O2-sensors attached while the PCV is disconnected, so I would run the bike as little as possible until the problem is fixed.
Jamie at Fuel Moto says he sees a very low failure rate for the PCIII and PCV (below 1%), and those that are returned as defective usually are not.
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