| Author | Message | ||
     Jamesw90 |
Hello, Looking for any advice/help. Have had long term issues with my bike not running correctly (Will not maintain idle, dies, coughs and backfires out of intake) Have replaced plugs, plug wires, voltage regulator recently as well as correct any engine lights/codes. Although I installed a new ecm about a year ago I am now down to trying another ecm to eliminate that as culprit. I would appreciate any advice and/or am looking for another ecm. Thank you for your time. | ||
| Reepicheep |
Have you looked at the Idle control, and the cam position sensor? And the wiring harness that comes out from under the flyscreen and under the frame? | ||
| Phelan |
08 has a crank sensor | ||
| Phelan |
Have you tried a TPS reset? It's very easy on the 08 up models. | ||
| Jamesw90 |
Thank you so far for the responses. I have replaced the IAC before but will recheck and clean it. I have gone over most of the harness but will do again. I do a TPS reset after every check through to always try to eliminate that as a possibility, but will look into the crank sensor. I just do not also understand that if one of these is an issue why I would not be getting any new engine codes? | ||
| Froggy |
You will only get a check engine light if the bike knows something is wrong. There is a very limited set of sensors, and if the sensors are reporting everything as good, the bike is none the wiser. For example, your bike lacks any fuel pressure sensor, so if you have fuel pump issues you can have issues like you describe, but the bike wouldn't be able to detect or report it. | ||
| Reepicheep |
Thank you, I was speaking in the general "the thingy that tells the ECM when to fire the spark" sensor. Which, as you note, is a cam position sensor up through 07, and then becomes a crank position sensor. On the Tubers, isn't it a cam position sensor also? The engine can't detect many crank position sensor failures. The ECM just thinks the motor never finished a rotation. It is basically a magnetically controlled "on-off" switch that turns on when a magnet field intersects a hall effect sensor. When it is failing intermittently, that gives you missed fires and mistimed fires, which can give some spectacular backfires. So whenever I hear "bad running with backfires" I suspect the cam/crank position sensor. | ||
| Natexlh1000 |
Your symptoms sound like the ones I was fighting on my 2008. It ended up being the ECU. I put a scope on the crank sensor and it made very clean sine waves with two missing every I think it was 28. The IDS "race" ECU fixed it and made the bike run great to boot. Here is my thread: http://www.badweatherbikers.com/buell/messages/142 838/791262.html | ||
| Reepicheep |
Interesting. Thanks for the detail Nate. I'll have to slap a scope on the 2008 and see what the good signal looks like. On the 2007's and earlier it's a square wave. |
