| Author | Message | ||
     Northrider |
Good day, went to start my 2007 uly and got a trouble code 21 flashing..bike runs rich and wont idle..checked the muffler valve actuator and found it cycling open/close with only a little throttle control..do i have a ecm failing?if i install a new ecm will i need a tps reset?anybody else have this type of problem?any suggestions would be greatly appreciated..thanks. | ||
| Al_lighton |
I can't say for sure whether it's the ECM or the servo, or even a bad wire. But, the way that thing works is that when the ECM decides it is time to open that muffler valve (only in High throttle conditions, briefly at 3200RPM or so as the engine spools up, and then again at about 5500 RPM, held open til redline), it sends 12V on one line, and a hall effect sensor in the servo tells the ECM that it opened. There are 3 wires in the bike side harness, 4 in the servo side harness, with the 4th wire getting grounded to the frame on the servo side harness. With little to no throttle applied, the servo shouldn't be getting the 12V applied to the servo to cause it to start opening. So I suspect the ECM. But check that ground lug. I can't imagine why it being loose would cause this, but it's easy to check and ALL problems are ground problems until proven otherwise (Al's 1st rule of motorcycle mechanics, ya know). I'd probably disconnect the three pin connector and probe that 12V line with a voltmeter and see if it is jumping around. It shouldn't be. I could see how that servo opening and closing the muffler valve could cause a crappy idle. Disconnect it altogether and see if the valve being steady closed fixes how it idles (this will obviously throw the 21 code, but won't hurt anything otherwise). But I'm not sure why it would cause it to run rich. These bikes idle in closed loop, if it is warmed up, it is running on the rear cylinder O2 sensor. So it things are right, it shouldn't be running rich, it should be at stoich. If it is the ECM, yes, you'll need to do a TPS reset. Al | ||
| Northrider |
Thanks Al for the info..I found the valve actuator unit to be faulty..Ordered a new one..When installed I will let you know what happens.. thanks again.. | ||
| Northrider |
Well, after replacing the interactaive exhaust valve and ordering a ECM from Erik Buell Racing racing I found out it was the TPS sensor that was giving me the wrong trouble code.. the local harley shop installed the new TPS and also a ECM from Erik Buell Racing racing and found the ECM to be defective.. it would not read the new TPS sensor that was installed..The original ECM was replaced and the bike stared up with no problem. I have contacted Erik Buell Racing racing to see if they could help in fixing the ECM issue, but have not heard back from them.. I hope this is not something Eric wants from his new company..Any body else experience this from Erik Buell Racing racing? | ||
| Terrys1980 |
I have seen a few posts lately on here about ecms from Erik Buell Racing causing poor running and higher temps. They ended up returning the ecm and Erik Buell Racing responding by saying they need to do some more testing. I am not saying not to buy from them, I would if I was looking for one. I am finally getting the hang of tuning by logging and tuning. | ||
| Husky |
I have 1437 miles on the Erik Buell Racing ECM in my 08 XT and I've never been happier. Out of the box it solved a hitch I had cruising around 3500 RPM where the bike would seem to loose a little power as if switching into the learning mode and leaning out the mixture. It idles at 1500 RPM when cold and 1050 a few minutes into warm up. Pulls smoothly from idle without ANY misfire or hesitations that had been a problem with the OEM ECM. It hasn't affected my mileage, which is around 48 mpg. Husky |
