running rich (high altitude) - MVAgusta.net
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post #1 of 14 (permalink) Old 07-11-2019, 03:14 AM Thread Starter
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running rich (high altitude)

Couldnt find that much info on this. I only really found one article about it: MV Agusta FAQ: Tuning 2) Idle, Base CO and Throttle Body Balance

So my bike has always run rich from day one. I'm here at Denver altitude, my starting elevation is 5500ft up to 10,000ft. it hasn't really been a problem, except for the poor gas milage. (or smelling like rich exhaust, which i secretly like)

Im wondering if using the methods in that blog, will help any? before i go tearing into it.
I just figured that the MV stuff doesnt adjust for altitude like a car does, and it seems to run ok. (but think it could be better)

brut 750 S
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post #2 of 14 (permalink) Old 07-11-2019, 05:38 AM
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Those methods will help some....so will an EProm from @merc07 on this forum.

What year is your Brutale? (And would you please put that information in your signature line through User CP?)

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post #3 of 14 (permalink) Old 07-11-2019, 09:44 AM
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The MV does in fact have an atmospheric pressure sensor.....

The real problem is that your bike is using a 1.6M ECU which was designed for a twin cylinder engine. The injectors and spark plugs both fire in pairs, which means you have a wasted injector spray on every cylinder (the wasted ignition spark is no big deal...common on many old 4 cylinder bikes).

Hard to get the fueling tuned just right with that spray of fuel against a closed intake valve in a port with no air flow occurring. MV did it pretty well, but compromises had to be made....exacerbated by your high altitude.


So...careful tuning of TPS, idle CO trim, and a proper map on the eprom (talk to Merco7/Adam) will help. If you REALLY want to make her run as well as possible you need to get a Microtec from X-Bikes that converts to sequential fuel injection.

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post #4 of 14 (permalink) Old 07-12-2019, 01:48 AM
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Quote:
Originally Posted by esq'z me View Post
The MV does in fact have an atmospheric pressure sensor.....

The real problem is that your bike is using a 1.6M ECU which was designed for a twin cylinder engine. The injectors and spark plugs both fire in pairs, which means you have a wasted injector spray on every cylinder (the wasted ignition spark is no big deal...common on many old 4 cylinder bikes).

Hard to get the fueling tuned just right with that spray of fuel against a closed intake valve in a port with no air flow occurring. MV did it pretty well, but compromises had to be made....exacerbated by your high altitude.
Ed;.
I.6M ECUs came on all Lancias including the turbo ones and all Fiats way before Ducati started using them '95-'02. Then they switched to 5.9 M
Then MV used them '99-'06 or '07
You have this phobia about non sequential injection.......
You need to stop and think about what happens
When the intake valve opens what happens?
1st it sucks in the last squirt that happened 360° ago.....what's that gas been doing? Vaporizing on the hot surfaces......so you're getting a better mixture.....what contributes to that? the air coming down the intake raising the pressure, not much because it's
10 times a second at idle
Then the injector fires and loads the 2nd half of the fuel....
Who gives a shit it if the correct amount of fuel goes in in 1 squirt or 2????? Besides it allows them to use a smaller injector

It is my understanding that the 1.6M ECU can drive 8 coils, 2 Lambda sensors, a MAP sensor and the rest of the usual suspects

I think the OP's problem is the atmospheric pressure sensor.......there is no test in the manual, it's not even mentioned
In the Electrical Section......in the Trouble Shooting Guide it says "if it's bad replace It's
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post #5 of 14 (permalink) Old 07-15-2019, 05:29 AM Thread Starter
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Quote:
Originally Posted by theknurl View Post
Ed;.
I.6M ECUs came on all Lancias including the turbo ones and all Fiats way before Ducati started using them '95-'02. Then they switched to 5.9 M
Then MV used them '99-'06 or '07
You have this phobia about non sequential injection.......
You need to stop and think about what happens
When the intake valve opens what happens?
1st it sucks in the last squirt that happened 360° ago.....what's that gas been doing? Vaporizing on the hot surfaces......so you're getting a better mixture.....what contributes to that? the air coming down the intake raising the pressure, not much because it's
10 times a second at idle
Then the injector fires and loads the 2nd half of the fuel....
Who gives a shit it if the correct amount of fuel goes in in 1 squirt or 2????? Besides it allows them to use a smaller injector

It is my understanding that the 1.6M ECU can drive 8 coils, 2 Lambda sensors, a MAP sensor and the rest of the usual suspects

I think the OP's problem is the atmospheric pressure sensor.......there is no test in the manual, it's not even mentioned
In the Electrical Section......in the Trouble Shooting Guide it says "if it's bad replace It's
Thanks MV
is this pressure sensor the MAP sensor? can you show me a picture?

Could it really be bad from brand new?

04 Brutale 750S
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post #6 of 14 (permalink) Old 07-15-2019, 06:25 AM
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It is the sensor on the air box... I doubt it is bad. There is a CO% trim potentiometer in your ECU. It probably needs to be set.

Check the service manual for the procedure.

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post #7 of 14 (permalink) Old 07-15-2019, 12:57 PM
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Quote:
Originally Posted by MikeDanger View Post
is this pressure sensor the MAP sensor? can you show me a picture?

Could it really be bad from brand new?
Not MAP sensor, there isn't 1 on 1st Gen MVs
Atmospheric pressure sensor/ambient temperature sensor is item #6
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post #8 of 14 (permalink) Old 07-15-2019, 09:44 PM
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Its amazing it even idles if its very rich. I would also first give the trim pot a try!
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post #9 of 14 (permalink) Old 07-25-2019, 03:30 PM
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I have been having the same issue with my 04 brutale 750. I moved from near sea level to 3500 feet and low RPMs seem really rich. I talked to a shop about it (non MV shop) and they just said it was the fuel having ethanol in the gas. Will running non ethanol fuel help or was he just blowing smoke?
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post #10 of 14 (permalink) Old 07-25-2019, 04:46 PM
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Quote:
Originally Posted by drifterz28 View Post
I have been having the same issue with my 04 brutale 750. I moved from near sea level to 3500 feet and low RPMs seem really rich. I talked to a shop about it (non MV shop) and they just said it was the fuel having ethanol in the gas. Will running non ethanol fuel help or was he just blowing smoke?
They are unfamiliar with your bike....and E10 gas doesn't cause that. Definitely blowing smoke.

Ask them if they know how to adjust the CO% potentiometer in the ECU...if they look at you like you're crazy, or try some more BS on you, find another technician...preferably one who has worked on older Ducatis with the same ECU.

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