Jump to content
The MT-07 Forum

Power loss on Eco Mode only !!


Groflan

Recommended Posts

If you flashed the ecu and the tuner changed fueling in closed loop

Then your bike is going to run really bad, because the ecu in closed loop low rpm is going top use the new fueling map in ecu, but the o2 sensor

Is going to battle it giving you that jerkiness and low power.

So what i suggest you is disconnect the o2 sensor in the plug

And retest. If i change my power commander fueling at low rpm

With the stock o2 conected it does what you say low power   jerkiness because the o2 sensor is battling my changes of fueling on high rpms it feels fine because the ecu runs fuel map in open loop so it bases fueling based only on ecu mapping

Link to comment
Share on other sites

Now i read it again and i saw that the bike is stock try removing the O2 sensor and see how it feels.i think that is your problem although you changed it you have it connected. Just disconnect it from the harness under Theo side protection and see how it feels. It costs you nothing and you can see imeaditly if the problem is the o2 readings and closed loop battling

Link to comment
Share on other sites

From what i saw is that if in anyway the fueling was changed in anyway (i saw it With wideband sensor) if it battles the changes the fueling would be a completei mess going from too lean to too rich and it would be doing it over and over but just in low rpm (where the sensor Works)

Link to comment
Share on other sites

  • 3 weeks later...

 

Hi every one and many thanks for your help.

geophb, I have already checked all these things

Today en paris, the wethaer is butefull, et and i decided ton open the motor. And the result :

Is it a disaster?

 

 

IMG_20200426_171902.jpg

IMG_20200426_172957.jpg

IMG_20200426_172950.jpg

IMG_20200426_171918.jpg

IMG_20200426_171927.jpg

IMG_20200426_171940.jpg

IMG_20200426_171956.jpg

Link to comment
Share on other sites

I don't see any obviously damage on any parts in the pics. The shiny tips on the cam lobes is perfectly normal.

Interesting to see cast iron cylinder liners? I thought these were plated motors. I like sleeves better. 

  • Like 1
Link to comment
Share on other sites

31 minutes ago, shinyribs said:

I don't see any obviously damage on any parts in the pics. The shiny tips on the cam lobes is perfectly normal.

Interesting to see cast iron cylinder liners? I thought these were plated motors. I like sleeves better. 

I am surprised too if it is.  Looks to me, more like gasket residue and combustion deposits that make it look like a sleeve.

  • Like 2
Link to comment
Share on other sites

Wait, I'm confused. Why did the engine get tore down? 

Did you do a leak down or compression test? 

What was results of a vacuum leak or o2 sensor check? 

Seems extreme to pull the engine down just to see.

Good news it all looks normal from the pics. 

  • Like 2
Link to comment
Share on other sites

17 hours ago, geophb said:

  Looks to me, more like gasket residue and combustion deposits that make it look like a sleeve.

I believe you are right about that. 

Looks much different on a laptop than it did on my phone haha

  • Like 1
Link to comment
Share on other sites

topazsparrow

Good time to port and polish that head :D

 

You can see the factory cross hatching on the cylinder walls still. Looks like its in good shape.

Edited by topazsparrow
  • Like 2
Link to comment
Share on other sites

On 4/27/2020 at 6:13 PM, Mechie said:

Wait, I'm confused. Why did the engine get tore down? 

Did you do a leak down or compression test? 

What was results of a vacuum leak or o2 sensor check? 

Seems extreme to pull the engine down just to see.

Good news it all looks normal from the pics. 

I did a compression test and found only 0.5 bar difference.

I have no vacuum leaks and did the test well with the O2 probe. No result

Yesterday, I tested a used cylinder head, new cylinder head gasket, valve clearance control. Once reassembled: no real difference.

The only part I haven't tested and replaced yet is the Pick-up Assy..

I am very tired

Link to comment
Share on other sites

 

Fixed 😃😃😎

 Bought 2019 engine used with 1500 milles for 450 $ (500 €) on accidented bike

Ans it works great 

Thanks everybody for help

IMG_20200508_202103.thumb.jpg.0b711b8322a7303963433f30f634d416.jpg

 

 

  • Like 1
Link to comment
Share on other sites

26 minutes ago, Groflan said:

 

Fixed 😃😃😎

 Bought 2019 engine used with 1500 milles for 450 $ (500 €) on accidented bike

Ans it works great 

Thanks everybody for help

 

 

 

Okay now that bugs me because we still don't know what was causing it. 😐

Glad its fixed though. 👍

  • Like 2
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.