no 1 and no 4 injectors not working.. - MVAgusta.net
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post #1 of 36 (permalink) Old 08-14-2009, 05:19 PM Thread Starter
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Question no 1 and no 4 injectors not working..

i have 03 f4 with 6000 miles. i've narrowed the problem down to the 1 and 4 injectors not working.. has anybody else had this prob and do i have to replace the ecu? any help would be great thanks

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post #2 of 36 (permalink) Old 08-14-2009, 06:05 PM
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how did you figure it out? if that's the case it sounds like the ecu since 2 of them are doing it.
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post #3 of 36 (permalink) Old 08-14-2009, 07:22 PM
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Or a poor connection to the injectors.

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post #4 of 36 (permalink) Old 08-14-2009, 07:36 PM
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How did you determine the injectors or the connection to them were not at fault? That plastic connector, while robust, is in a high heat area. If you could see how small the two wires are that actually carry the current to the injector you would be surprised.
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post #5 of 36 (permalink) Old 08-14-2009, 08:12 PM Thread Starter
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i checked multiple things but it came down to revving it in the dark and only the two and three exhaust pipes got hot (red). so i checked to see if it was spark and that was fine. started the bike and unclipped the no 1 injector and it ran the same, i left it off and unclipped the no 4 too and it kept running with no change, lol. so im thinking ecu??

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post #6 of 36 (permalink) Old 08-14-2009, 08:19 PM
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I don't know. I'm thinking injectors. The way to tell for sure is to borrow some 750 injectors from a forum member who sells used MV Agusta parts. If it turns out the injectors are your problem, pay for them. If not, send them back.
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post #7 of 36 (permalink) Old 08-14-2009, 08:29 PM
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Buy an injector tool kit or see if you can borrow one. Good mechanics should have one. and it will tell you if the ecu is causing the problem or just a connection. Buy a dielectric grease and put it on all your connector and it will save you a lot of headaches


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post #8 of 36 (permalink) Old 08-14-2009, 09:53 PM
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I think I would be talking to CAG about trying injectors before I started looking to buy an ECU.

Wiring connections are a much more frequent cause of a problem like this, but since the ECU does fire the injectors in pairs it could be the ECU....still, not very common.

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post #9 of 36 (permalink) Old 08-14-2009, 11:46 PM
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1&4

104ina55;
since 1&4 don't seem to be squirting, pull the connector off either one and connect a multimeter to the connector, do you see any voltage with the engine running ?
are you running a PClll? unplug it and see what happens....
i doubt the ECU would lose a driver but then again its electronics......

DOUBLE check all the connectors and use dielectric grease on ALL connections

just a thought pull the plugs off 2&3 and put them on 1&4, it might not run well, but if it does, then its looking more like an injector driver in the ECU

of course 1&4 are on the same coil too......got spark on them?

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post #10 of 36 (permalink) Old 08-15-2009, 04:46 AM
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I think you may find it's a wiring fault, how good are you with elec stuff? I can guide you through the wiring and plug connections to the ecu if you have a meter.

A couple of points, the injection is not sequential so swapping plugs over will not do any harm. it's doubtfull two injectors would fail at the same time

The injectors should be supplied with 12v all the time....the ecu earths stuff to operate it so first check is to look for 12v supply to the injectors (you need to be pretty quick after turing the ignition on as the ecu turns the power off after a few seconds) my diagram says the 12v supply should be a green/red wire.

The injector return to the ecu is on pins 5 and 22 at the ecu, you could check this easy with the bike running, they should both have 12v available for the ecu to earth and hence fire the injector, if they both have 12v there it's your ecu or the ecu plug connection at fault, if one has zero volts you have a wiring fault.

Ecu pins: pin 5 Orange/blue cylinders 2/3
pin 22 Grey/red cylinders 1/4
However, MV did change colours occassionally!!!

(This reply has not been checked for punctuation, grammar, or spelling mistakes and is devoid of any big long cleverwords or condescending manner)


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Last edited by mikef4uk; 08-15-2009 at 04:50 AM.
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