Strange jump from idle to 2000rpm - MVAgusta.net
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post #1 of 9 (permalink) Old 04-08-2018, 05:23 PM Thread Starter
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Strange jump from idle to 2000rpm

Had a run out today and the F4 was brilliant as usual its a 2006 1000s with 10k miles on two occasions I came to a stop at junctions and the idle jumped to 2000rpm give or take and quickly returned to idle. Engine fully warmed up and running well other than this.
I cannot reproduce it now but will strip it one evening this week just wondering if anyone had this issue at some point and could pass on some tips.

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post #2 of 9 (permalink) Old 04-09-2018, 03:44 AM
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Air leak......check your vacuum lines and intake manifold hose clamps

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post #3 of 9 (permalink) Old 04-09-2018, 06:45 AM
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EBS momentary malfunction? Relays are known to be affected by heat.

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post #4 of 9 (permalink) Old 04-09-2018, 04:41 PM Thread Starter
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My EBS relay has been removed courtesy of Merc07 mod. but I can agree your thinking. Iwill pull off tank and airbox and check for air leaks.

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post #5 of 9 (permalink) Old 05-15-2018, 02:25 PM Thread Starter
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OK had a couple of hours in the garage on the MV F4 2006 Model and removed the tank airbox etc checked out the air pipes and throttle to head seals all ok. cleaned air filter and resealed back in airbox put some free play on the throttle cable at the throttle body end as there was non at all.

Refitted airbox and tank and started up ticked over ok.

Time to check TPS it was set at 300mv I reset to 150mv . Fired her up very steady idle and crisp off the throttle. re-balanced t/Bodies not out alot but set them up . Big difference.

Out on the road : Faster , responsive and smoother and no idle issues at all.

So my problem is solved .

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post #6 of 9 (permalink) Old 05-15-2018, 02:52 PM
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Good result. No smoking gun though?

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post #7 of 9 (permalink) Old 05-16-2018, 04:55 PM Thread Starter
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To be honest no gun but with hindsight I think the throttle free play was the issue as when it played up on idle I noticed if I held the throttle grip closed it would not rise on the revs and it did only start after I released the left return spring to get a lighter throttle.

So to summarise I :

Released the left return spring and the throttle acted up , holding throttle closed stop the idle issue.
I checked everything as above and reset the tps purely as I have never checked it since I got it.
it all seemed well then I noticed that I could not adjust throttle at the grip end using the knurled adjuster.
I introduced some free play at the throttle body and then set TPS and did the balance.

So I suspect the throttle free play was the issue but it runs so well now I should have done the other stuff a while ago.
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post #8 of 9 (permalink) Old 05-17-2018, 05:57 AM
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Ah. The old mechanics adage: The current problem is caused by whatever was done just prior.....

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post #9 of 9 (permalink) Old 05-19-2018, 05:11 PM Thread Starter
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Quote:
Originally Posted by silentservice703 View Post
Ah. The old mechanics adage: The current problem is caused by whatever was done just prior.....
Exactly that but usually most folk will say no I haven't changed anything.

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