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Old 15-05-2017, 12:10 AM   #4
Luddite
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Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
Posts: 2,465
Don't give up just yet!

A couple of things to check.

Firstly, in your earlier thread you said that, after reinstalling the remapped ECU, you ran it for 10 minutes then turned it off.

The purpose of this exercise is to reset the TPS (throttle position sensor). This needs to be done any time the ECU is disconnected. A dealer can do this instantly using the diagnostic tool but, in the absence of this, the 'warm up' procedure accomplishes the same thing.

Note that it is not the length of time the engine is ticking over that resets the TPS, but the reading on the temperature gauge. You need to start the engine from cold then, without touching the throttle, let it idle until three bars come up on the temperature gauge, then turn off the engine. This could take 5 minutes or 15 minutes depending on the ambient temperature. The important thing is not to turn it off before three bars are showing on the temperature gauge.

So, if there's any doubts that you got up to three bars during your 10 minute run, try doing it again.

Secondly, in order to achieve optimal running, the ECU continuously monitors data from its various sensors to 'fine tune' it's own default settings. It is, to a certain extent, self-learning. There are a number of criteria in the ECU that are progressively fine tuned in this way and these are called 'auto adaptive parameters'.

Now, these optimised parameters can be deleted by a dealer manually or if updated software is downloaded. Also, when a Rexxer map is downloaded, the previously stored auto adaptive parameters are deleted.

Following such a deletion, the ECU can only use its default values until it has again relearned those optimised values.

Symptoms of an ECU that has had its auto adaptive parameters reset include:

• Rough running especially at and off idle.
• A tendency when slowing down for the tickover to hover around 2,000 rpm for a few seconds before dropping to normal.
• The possibility of the motor stalling for no apparent reason.

It usually takes around 100 - 200 miles for the ECU to relearn its optimum settings so I'd suggest you continue to ride as normal and you should see an improvement.

If it's no better after, say, 300 miles, give Neil at Cornerspeed a ring and see if he has any suggestions.

Thirdly, it is possible your throttle bodies might need balancing but see if things improve naturally first before considering any other work.

Hope that helps.

Last edited by Luddite; 15-05-2017 at 12:13 AM..
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