My 07 Deuce came with Vance and Hines Big shot Staggered pipes. I put the Fuel Pak 3 on after adding an intake. I can not tune it properly because there seems to be no O2 sensors. I checked the exhaust up and down (on the bike) and there doesn't seem to be a bung or anything to replace the O2 sensors. So how would I add O2 sensors back to the bike? Im I missing something on the exhaust. Never dealt with a fuel injected bike.

 

What happens is when aftermarket exhaust is added with the presumption of a tuner as well, the o2 sensors are deleted and in the case of adding let’s say a power commander, there are dummy connectors that attach to the o2 sensor connectors on the bikes “harness side”. This tricks the ecm into thinking that the o2 sensors are in “closed loop” and are ready to perform their tasks at controlling fuel trims. Therefore the exhaust pipes on your bike aren’t plumbed to accept sensors. You will need new exhaust pipes and sensors if you have none. I’m assuming you bought the bike with these pipes on it?

 

2007 was the first year Harley went to all EFI bikes, no carbs in the model line-up......

Since that time, most big name exhaust makers will have the O2 bungs on their head pipes, even on headers that fit to a non-O2 sensor bike. That allows them to make one head pipe for numerous year models, both without or without O2 sensors. The exhaust will usually be sold with O2 bung plugs to block the O2 bungs on models that don't need O2 sensors.

FYI.... The V&H big shots I bought for my 2003 (non O2 sensor EFI) back in 2003, do not have O2 bungs. Their newer version of that pipe DOES have O2 bungs, so it can fit across O2 & Non O2 model bikes. The bungs are on the back side of the pipe, about 3-4ish inches down from where the header fits into the heads.

If your 2007 Deuce had no O2 sensors when you bought it, one of two things happened....

1) The prior owner tuned it and the tune did not use O2 sensor feedback (all open loop). He would have shut off (in the tune) and removed the O2 sensors...

If this is the case, the bike should have been running well, before you changed anything.

You could then buy a full featured flash tuner (the FP3 is just a very basic flash tuner I don't believe it can handle this job), and start with a whole new tune. You can then decide if you want to add the OEM O2 sensors, or leave them deleted... then flash a new, appropriate tune...

2) The prior owner was stupid & lazy, got a deal on an exhaust without O2 sensors, decided to run it without O2 sensors, and didn't change the tune...

If this is the case, the bike probably would still run OK, but not optimal and probably rich. The ECM would fallback to it's default AFR value without O2 sensor feedback, and the bike usually runs rich in default open loop mode.... Without a proper tune for Open Loop (no O2 sensor feedback) in the ECM with the O2 sensors turned off, you will probably have a check engine light and throw a code...

You would then be able to just add O2 bungs to your current exhaust (or buy a new exhaust with O2 bungs), then add the OEM O2 sensors, and use your FP3 to tune the bike.


You should really find out IF it was tuned, and if the O2 sensors were turned off, to know how to proceed....

Since the FP3 is just a basic tuner, and I have no experience with it, I do not know if it can tell you if your ECM was tuned from OEM and/or the O2 sensors were turned off.

I know a PowerVison or TTS tuner could tell you that info..

Talk to an FP3 expert and you MAY be able to do what you need with the FP3, I just don't know enough about it to say for sure..

Good luck with your tuning...

 

When I bought the bike it had the V&H pipes and a Fi2000 tuner witch from I read bypasses the MAP. I added the intake and the bike did not run right. So I removed it. It was plugged into the computer and into the injector harnesses. I removed it, plugged the wires back into the injectors and put in the FP3. I do not see any bungs in my exhaust. So I am guessing I need to either get a new exhaust with O2 sensors or modify this one.

 

I prefer a tune with O2 sensor feedback, but my 2003 has EFI, no O2 sensor feedback, with an all open loop tune, and it runs excellent....

Again, I'm not familiar with the FP3...... You may want to contact them and see if they have an all "open loop" tune for your engine/mods... If they do, you won't need to add O2 sensors... You could try that open loop tune for awhile and see if it works for you....

 

If i remember correctly my 02 did not run 02 sensors even stock
and it is an EFI bike

 

You remember correctly...

The OP's bike is a 2007.... That was the first year of all models having the O2 sensors from the factory ....

Prior to 2007, all bikes without O2 sensors, that had EFI, had "open loop" tunes..

With the addition of the O2 sensors, the tunes changed to part Open Loop and part Closed Loop..

 

It came with O2s. I found the harnesses. So I think I am going to see what it will take to add them back. Either welding bungs to these pipes or getting a new exhaust. Not sure what I would have to do to the EFI if anything.

 

If your bike has been running fine without them, and you have no check engine light, it strongly suggests that you have them turned off in the ECM, and an all open loop tune..

If that is true....

Once you add the harnesses and the O2 sensors, they will do nothing until you (or a shop you hire) uses a tuner to turn the O2 sensors back on in the ECM, and then flashes a proper tune (part open loop and part closed loop) for them to work, and have any affect on the bike's performance...

 

These are currently on the end of the O2 wires.