| Author |
Message |
    
Shabangles
| | Posted on Monday, March 05, 2012 - 09:37 am: | 
|
I have a 2007 Uly with the Buell race kit (pre EBR ecm) and it started acting up over the last week. This bike has a little bit of history from a few years ago when the wiring harness was shorted out and the computer was fried by my local dealer during another repair. The wiring harness has been repaired and the computer replaced and I have ridden the bike about 2500 miles since the repairs were made. While I was fixing the wiring harness I went ahead and added two additional ground connections between the battery and engine and the battery and ecm ground location. The bike has been running great but had a slight miss between 2900 and 3000 rpm, but over the last two weekends it started acting much worse.
After riding the bike for a little while at low throttle inputs (25 mph stop and go) it is starting to miss and try to stall out when I take off. The idle gets very rough and the bike has trouble taking off from a stop. I have not had a chance to hook ECMSPY up again, but it feels like the bike is running rich. When it starts acting up I can let the bike idle for about 5 minutes and it will fix itself. The idle starts out very rough and you can smell that it is running rich, but it gets better in stages and after a few minutes it will run perfect again. The bike did this to me twice yesterday and once last weekend, but has run great otherwise.
I originally though this was an O2 sensor issue, but the fact that the bike will fix itself at idle is throwing me off. Has anyone else had a similar issue with the race ecm? |
Two_seasons
| | Posted on Monday, March 05, 2012 - 11:28 am: |
|
Two things.
1.) check your battery voltage, roughly 12.x when off, 13-14.x volts when running
2.) check your battery connections, snug
EDIT: and make sure your ECM isn't cracked. Some on BadWeb have experienced the seat riding on the ECM and, over time, it cracks it.
(Message edited by two_seasons on March 05, 2012) |
Shabangles
| | Posted on Monday, March 05, 2012 - 01:15 pm: |
|
I checked the battery connections yesterday and they are clean and snug. The ECM was a new in box older race ECM and it was not cracked when I was checking things out yesterday. My original ECM had signs of the seat rubbing on it, so I have the new ECM mounted down lower in the same area so the seat will not make contact.
I am going to try to datalog the bike this afternoon to see if anything odd shows up and I will check the battery voltage then. |
Shabangles
| | Posted on Monday, March 05, 2012 - 06:39 pm: |
|
I just did a datalog on the bike and the ecm voltage fluctuates between 13.6 and 14.6 as I ride. I reset the AFV before the ride (was 125) and during my ride it rose to 125 again. The increase in AFV seems to help the low load running, but the bike still stumbles. I also ran the VE analyzer and it only changed the values around TPS 20-50 and 2400-4000 RPM. The largest change was 18 and it added fuel everywhere. I have not loaded the new map on the bike and am hesitant since it ran great for the last month and a half (other than the slight miss around 3k and low load). |
Terrys1980
| | Posted on Monday, March 05, 2012 - 06:59 pm: |
|
Your bike is running very lean. I wouldn't add fuel to the maps until you find out what is causing the AFV to go up so much.
I would lean towards an intake seal leak.
There are other situations that would cause it to go that high such as low fuel pressure, incorrect timing or TPS setting, or injector o-ring leaks. |
Froggy
| | Posted on Monday, March 05, 2012 - 07:05 pm: |
|
quote:Your bike is running very lean. I wouldn't add fuel to the maps until you find out what is causing the AFV to go up so much.
I agree, the bike is running lean, or thinks its running lean and either way is trying to compensate for it. |
Shabangles
| | Posted on Monday, March 05, 2012 - 07:52 pm: |
|
I have not made any changes to the maps since the bike started running poorly so suddenly. I thought about an intake leak, but wouldn't the bike run worse at idle?
I set the TPS a few weeks ago and verified that it was still correct when hot today. Is their an easy way to check the fuel pressure or injector o-rings?
Thanks |
Terrys1980
| | Posted on Monday, March 05, 2012 - 10:17 pm: |
|
I've never done a fuel pressure check.
The service manual shows installing a fuel pressure gauge adapter inline between the fuel line and throttle body. You can buy a fuel pressure test kit on Amazon for $32.
How does the fuel pump sound when you turn the key on and it primes?
I seen on your profile that you're from the Baton Rouge area, I live in Houma.
(Message edited by TerryS1980 on March 05, 2012) |
Shabangles
| | Posted on Tuesday, March 06, 2012 - 10:01 am: |
|
The fuel pump sounds like it always did and I can hear it prime when I turn the key on. I will try to get a fuel pressure gauge kit in the next few days and give that a try.
Last night I looked over my datalog a little bit more and noticed that my TPS was not reading a steady value while cruising. It was not radically jumping around put their were small blips when I held the throttle steady. The TPS also seemed to bounce around a little at idle, so I am thinking their may be a problem there. I will pull the airbox off today and check that out. I also found that the oxygen sensor at one point held a constant value during my ride instead of bouncing up and down. I know it normally stays at around .5V while the bike is warming up, but this was midway through my ride while cruising at around 45 mph. I don't remember what the value was, but that did seem odd to me. While I have the airbox off, I am going to check to make sure I don't have any shorts or loose connections.
I actually have a new oxygen sensor and new intake seals from my issues with the bike a few years ago that I can install if needed. This bike had issues in the past with the computer thinking the bike was lean when the harness was shorted out and the factory computer was fried. The repairs to the harness and new pre-EBR race ecm seemed to take care of the issues for a few months (and over 2500 miles), but I am suspicious that the oxygen sensor may be acting up after the bike having so many issues before. Does it sound reasonable that this could be an oxygen sensor that is starting to foul out?
Terrys1980, their are a few Ulys in Baton Rouge that I have run into. If you are in town and run across a black one with Happy Trails boxes that is most likely me, especially if you see the bike stumbling.... |
Shabangles
| | Posted on Tuesday, March 06, 2012 - 05:41 pm: |
|
I attempted to attach a screenshot from part of my datalog below. As you can see, RPM is pretty steady at 3100 but the throttle position is bouncing around slightly. The oxygen sensor also stopped its normal fluctuations and held at .8V. Is this normal?
|
Terrys1980
| | Posted on Tuesday, March 06, 2012 - 05:50 pm: |
|
The O2 sensor should not be doing that. You might want to check the wiring for that. It has been known to chaff and cause some issues. |
Shabangles
| | Posted on Tuesday, March 06, 2012 - 08:18 pm: |
|
I just finished checking all of the wiring around the ecm and throttle body. I could not find any shorts or bad connections on the oxygen sensor, but I did find that if I messed with the throttle position sensor plug the readings on ECMspy went nuts.
I took the tps plug apart and checked the wires there and could not repeat my issues with either plug alone, so I am hoping it was just a bad connection between them. I also found that today while at idle the tps reading had a steady value of 13 in 8bit, where yesterday at idle it was fluctuating between 6 and 12.
I looked into the possible cause of the steady high o2 sensor reading in my service manual and it showed that one of the issues might be high fuel pressure from a constantly running pump. I have a thread saved from a while back about chafing on the fuel pump wiring and have the gaskets here to pull the pump and check it out, so I am going to try to go ahead and do that this weekend to be sure. |
Terrys1980
| | Posted on Tuesday, March 06, 2012 - 09:22 pm: |
|
Yes a constantly running fuel pump would cause a rich condition and bring the O2 sensor voltage up but your AFV(@125) says otherwise. |
Shabangles
| | Posted on Wednesday, March 07, 2012 - 02:55 pm: |
|
I am thinking that the fuel pump may be running inconsistently causing some of the problems. The o2 sensor reading does seem odd, but I have found on several other datalogs (both my bike and another example) where the pulse is relatively consistent for a short time.
I am also concerned about the fluctuations in the tps reading. It seems to me that without a steady tps reading the computer has no chance of knowing what is going on and fueling properly. Does this seem reasonable? I was able to clean the plug up and get it to hold steady and I have a new sensor on the way since I know that wire shorted out at one point anyway. |
Terrys1980
| | Posted on Wednesday, March 07, 2012 - 03:19 pm: |
|
Yes if the TPS sensor is giving incorrect readings then the ECM will be reading from the wrong point on the maps. |
|
Troubleshooting (Poor Starting/Running/Handling/Ride Issues) »
Archive through May 13, 2012 »
2007 Uly Rough Running at Low Throttle