| Author | Message | ||
     Andros |
I have tried to update my ECM many times with the very knowledgeable help from a very helpful Dris from TM. We have discovered that there is something completely wrong with my bike since it reacts completely different than other identical bikes to the same ECM. My bike needs a crazy rich map to run semi smooth. When we then try to pop my ECM into an identical bike it doesn't even run because its so rich. So we're suspecting there is something wrong in the throttle bodies. A possible leak somewhere or a bad air sensor?! Or? Any ideas or experiences on what this could be?! Please help.... | ||
| Dannybuell |
I am not a techie. When you did the drag bar conversion you may have created a vacuum leak somewhere installing the new throttle cables? Do the butterflies open completely at wide open throttle? | ||
| Andros |
It was mounted with the highbar cables from the dealer when i bought it so i didn't disconnect them. BUT the dealer can have messed it up though. Will that make a difference really?! | ||
| Kirb |
Injector problem? Clogged injectors may need more fuel just to run. | ||
| S21125r |
Something is disturbing the AFR of what the O2s is seeing so the ecm is compensating. Since you seemed to indicate your bike ran under those condition yet another bike doesn't leads me believe it is not your O2s but something else between the bounds of closed loop. So either the engine is getting more air than expected, or less fuel than expected. What are the AFV for each cylinder? If one is really rich compared to the other then that is where i'd focus attention to. Either a leak between the TB and head or a clogged injector possible. | ||
| Dirty_john |
sounds like injector issues to me | ||
| Joshinga |
It could be a intake leak but it would have to be a pretty extreme one. easy way to check is to spray some brake clean around the boots while the bike is running it the rpms go up you got a leak if they don't look for something else. the injectors could be an issue but again it would have to be the perfect storm of issues all at once for that to happen. Ok a few question for you. What ECM do you have? and have you tried to put a stock ECM from a good running bike in yours to see if it runs right? Electrical parts are a PITA to figure out a lot of trial and error. I would try to put stock stuff on one at a time till it works right. Let me know if that helps or you have any more questions. | ||
| S21125r |
Another thought - could be low fuel pressure too. | ||
| Chevycummins |
Low fuel pressure? Faulty MAP sensor, those are the 2 things that would effect it that much that the map would not work on another bike. Might want to check them. | ||
| Hdwrenchtx |
does it runs fine with the stock ecm? if so then i dont think it would be a fuel pressure or sensor issue | ||
| Andros |
the bike was jerky in the low revs (0-4500) with the stock ecm and stock can. Still jerky with stock ecm and aftermarket can and also jerky with aftermarket can and aftermarket ecm. | ||
| Gemini |
check tps voltage, check map sensor and baro sensor, make sure the little hoses to the map sensor near the throttle body are in good shape. check fuel pressure both with guage and electronicaly. compare all temp sensors while engine is cold and be sure they are real close to one another and to actualy temp. do you have anyway of doing a data recording? | ||
| Colintornado |
In diag mode the fuel pressure can be seen,I think it should be around 400 kpa(mine is).The MAP pressure is 47kpa at idle and 37kpa at 3000rpm on mine so worth checking your figures. I have a similar problem on my benelli,I have had to increase the fuel by 20% to correct the running ! I suspect low fuel pump pressure in this case but have got to make an adapter to test the pressure,at least the Buell has the pressures shown in the diag display. | ||
| Tpoppa |
Easy stuff first. Has the TPS been reset? Are there any trouble codes? You could have a bad sensor or injector. An exhaust or intake leak could be the cause, but it would need to be a bad one and should be easy to see. | ||
| S21125r |
Wouldn't a faulty pressure sensor or fuel pump set a CEL? That's why I keep coming back to an intake manifold leak or low flowing injector as a primary source. Those have no "watch dog" to monitor them other than what O2/AFV trend indicates. That theory doesn't pass smell test though if both cylinders are asking for overly rich. Would be quite a coincidence that both cylinders would have a manifold leak or bad injectors at the same time. Andros - need more details/data I think... | ||
| Andros |
Thanks everyone. I really appreciate you help. Tonight it threw a CEL. So: how do i check afr and all those sensors. What do need to press? And how do i check the error code? | ||
| Andros |
Tps has been reset correctly. | ||
| Colintornado |
Press the 2 buttons on the left of the dash as you turn ignition on,then press the lower button to scroll through and you will see all data. | ||
| Andros |
Will check now | ||
| Andros |
The bike needs to be running or just on!? | ||
| Colintornado |
It works running or not running. | ||
| Littlebutquick |
WHAT year is the bike on the early ones the fuel pipe to the injectors at the rear theres a T joint thats made out of plastic it drys out with heat from the engine then cracks they replaced them with a metal one on later bikes this will give you low fuel pressure | ||
| Andros |
Tps voltage 0,5-3.8 Map kpa 100,5 Map voltage 4,0 Iac steps 145 Fuel kpa 390 Fuel voltage 3,2 Fr02 voltage 0,4 Rear02 voltage 0,4 Tipover voltage 1,3 F adapt fuel 100,0 R adapt fuel 100,0 Act int sys error P--- V speed sys error P0503 Battery voltage 12,3 Airtemp voltage 3,7 | ||
| Gemini |
with those afv values, is that with your custom tune or with a stock tune? | ||
| Andros |
Idle Tps voltage 0,5-3.8 Map kpa 33 Map voltage swingin between 1,9-3,2 Iac steps 100 Fuel kpa 400 Fuel voltage 2,8 Fr02 voltage 0,4 Rear02 voltage 0,7 Tipover voltage 1,3 F adapt fuel 100,0 R adapt fuel 100,0 Act int sys error P--- V speed sys error P0503 Battery voltage 14 Airtemp voltage 3,4 Coolant voltage 1,6 Sw 6,0 Cal 1,0 | ||
| Andros |
Custom tune | ||
| Brumbear |
sounds like it is running in cold mode all the time water temp sending unit ? | ||
| Andros |
No it just wasnt heated up properly. | ||
| Gemini |
i would like to see it with a stock tune and a data log if possible. with the afv being at 100, either you did a great job tuning for the way it is running or the afv is locked. either way it is limited info because the o2 is only a sample for that moment that you look and we don't get to see the ego adjustment. | ||
| Colintornado |
Andros,by the way I am not a "hardcore technician".One thing I notice is the MAP pressure lower than on mine at idle,I realize the actual figure is relative to the air pressure of the place you are situated and also the state of the particular engine.A lower pressure means lower density air therefore the fuel would be adjusted to match ie less fuel. Perhaps you can also read the map at 3000 rpm and perhaps some one else can state what map pressure they get ? this may show you have a faulty map or barometric sensor or perhaps a leaking connection ? As I say I am not an expert,just interested to see the cause of your problem. |
