2001 F4 wiring/injector question - MVAgusta.net
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post #1 of 23 (permalink) Old 08-11-2019, 06:02 AM Thread Starter
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2001 F4 wiring/injector question

My F4 is quite sluggish below 6000rpm, above that its fine but idles and starts ok.

I'm in the process of getting the injectors sent away and serviced, that may be the problem, maybe not, but after issues ive had with perished fuel tank hoses there is probably crap in them.

Anyway, the confusing thing, while I was stripping the bike down to take out the injectors, I noticed the #3+#4 injector feed wires which are marked 3 + 4 were the wrong way around, so I switched the leads onto the correct injector, fired the bike up and took it out the road for a test run.

Now the bike started up and idled fine, but to the best of my knowledge its running the same, below 6000rpm the same and above the same.

My limited knowledge is telling me that switching the leads should make a difference to the running of the bike as the injector would be squirting in fuel at the wrong time???



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post #2 of 23 (permalink) Old 08-11-2019, 12:16 PM
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I am not completely sure, my knowledge is most about the Brutale. Does your bike have a 16M ecu? Anyway i think 2001 F4 does not have sequential injection and it does have batch fire injection so it squirts 1+4 and 2+3 at the same time (not timed in relation to the combustion cycle, it is crank angle timed i think). So if the connectors were marked correctly you set them back to as intended. If they were marked incorrectly you set them as unintended. If they are wired as unintended fuel atomisation might be slightly different than cyl 1+2. And the 2 cylinder might run slightly richer or slightly leaner. I have no idea of how much richer or leaner. You could double check by lifting the tank and take airbox off, start the motor and see if 1+4 and 2+3 squirt at the same moment. You could also multimeter the injector connector and ecu connector pins to see if 1+4 lead to the same ecu pin and 2+3 lead to the same ecu pin.

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post #3 of 23 (permalink) Old 08-11-2019, 01:50 PM
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I have pretty much the same bike (2000 model). I'd say mine is pretty much the same. From 5k to redline it pulls like a frieght train. Below that it's vastly different. What's especially noticable is the hole at 4k.

I think you're on to something by cleaning the injectors. My bike sat for the past 4 years and had 3,900 miles when I bought it...over an almost 20 years span! The more i ride it, the better it gets on the bottom end...but it's still not linear. That 5k-6k blast of power feels like an 80's turbo car the way it hits.

Once your injectors have been cleaned, please let me know your experiences?

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Last edited by Drewbert34; 08-15-2019 at 09:05 AM.
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post #4 of 23 (permalink) Old 08-11-2019, 02:22 PM
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That 4K dip and the lack of linear power below 5K is ECU tuning. Done at the factory for emissions. There are many discussions about it within the forum.

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post #5 of 23 (permalink) Old 08-11-2019, 03:05 PM
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Quote:
Originally Posted by silentservice703 View Post
That 4K dip and the lack of linear power below 5K is ECU tuning. Done at the factory for emissions. There are many discussions about it within the forum.
What phrase do i have to search to find those discussions?

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post #6 of 23 (permalink) Old 08-12-2019, 07:28 AM Thread Starter
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Thanks for replys, I had to leave home for a rushed job, I'll post up more findings when I get back in the next couple of days
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post #7 of 23 (permalink) Old 08-12-2019, 07:50 AM
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Quote:
Originally Posted by Robbedoes View Post
What phrase do i have to search to find those discussions?
If you search all post using ECU Tuning, you will get 35 pages of results.

If you search Thread Titles using ECU Tuning you get five gems:

https://www.mvagusta.net/forum/21-cu...-software.html

https://www.mvagusta.net/forum/21-cu...rr-engine.html

https://www.mvagusta.net/forum/21-cu...0-qd-slip.html

https://www.mvagusta.net/forum/21-cu...-east-usa.html

https://www.mvagusta.net/forum/21-cu...g-odonata.html

Here is the good one for the 1.6M crowd:

https://www.mvagusta.net/forum/21-cu...-software.html
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post #8 of 23 (permalink) Old 08-12-2019, 10:21 AM
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Originally Posted by silentservice703 View Post
If you search all post using ECU Tuning, you will get 35 pages of results.
Thanks for taking the time to look up the threads (they are usefull to me) for me but i was not referring to ecu tuning in general but more specific to where the "4K dip and the lack of linear power below 5K" is discussed. Do you know where that is covered?

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post #9 of 23 (permalink) Old 08-12-2019, 11:07 AM
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In any thread talking about ECU tuning generally.

Teh ECU tuning in the Northeast thread covered it, but here is the original map and the tuned map for my 312R...you can see the dip and the low response below 5K.

Name:  312R Dyno Run (initial).jpg
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Name:  312R afterBIG.jpg
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'07 Ducati Monster S4Rs, '07 Ducati Monster 695
2010 Harley Davidson Ultra-Classic Electra-glide CVO FLHTCUSEBLK
'63 Honda C100A Cub
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post #10 of 23 (permalink) Old 08-13-2019, 08:13 AM
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There is still a dip in the tuned map?

Was timing not addressed during the tune, or is it something that timing cannot resolve?

2000 F4S
merc07 eprom
AMB Air Filter
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