Poor idle - MVAgusta.net
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post #1 of 40 (permalink) Old 03-25-2017, 04:31 AM Thread Starter
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Poor idle

My F4 1078 MY09 got a poor idle for few weeks.
It has been decat for 1 year and has very few km (less than 2000km).

I have reset TPS (from 2,6 to 2,3) and tried to balance body throttle.
But problem is still there.

I checked with JPDiag and have 2 fault codes:
P0105 Manifold Absolute Pressure/Barometric Pressure Circuit
P0110 Intake Air Temperature Sensor 1 Circuit

I'm thinking about air temp sensor inside left air funnel????

Last edited by jejemg; 03-25-2017 at 06:36 AM.
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post #2 of 40 (permalink) Old 03-26-2017, 03:38 AM Thread Starter
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Well, I took an air sensor on my Ducati (they are the same).
Fault code disappeared but not the idle problem.
Engine is still stalling and idling bad once warm.

I don't think about fuel filter or sparks : they are less 1500km and engine is running very very well above 400revs.
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post #3 of 40 (permalink) Old 03-26-2017, 05:39 AM
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Have you tried fresh fuel with good octane?

even a blind squirrel gets a nut once in a while!!
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post #4 of 40 (permalink) Old 03-26-2017, 11:49 AM Thread Starter
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Not yet My fuel is 6 month old (before winter).
Effectively !!!
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post #5 of 40 (permalink) Old 03-26-2017, 12:01 PM
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This is the first thing to check! Bad fuel has caused others a lot of grief before they figured it out and the simplest thing to do. GL

even a blind squirrel gets a nut once in a while!!
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post #6 of 40 (permalink) Old 03-28-2017, 04:24 PM
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Originally Posted by lefin102 View Post
This is the first thing to check! Bad fuel has caused others a lot of grief before they figured it out and the simplest thing to do. GL

Without a stabilizer, 6 month old fuel is almost certainly the cause especially if it contains ethanol.
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post #7 of 40 (permalink) Old 03-28-2017, 05:11 PM
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Last year a new member chased a problem for months! Literally pulled everything apart, wiring, coils, ECU, the time invested was intense. Checked timing,TPS , wiring continuity you name it. Problem was low octane fuel!!

I myself a few years back was helping a friend with rough idling on a Chevy van. Not MV related but read on. the van had been neglected to say the least. Checked everything, full tune up etc. What was the last thing done before the issues started! He filled up at a convenience store while a tanker dumped fresh fuel @ 6AM.

What was the last thing I checked? The fuel filter. Yep filled with water. Think the tanker stirred the pot? It sure did. Wasted a weekend for water filled filter.

It happened to me again with my own truck later that year. This time I was a little better prepared and only took 2 hrs to figure it out. Fuel filter was filled with water. Never happens right. Today's fuel is crap.

even a blind squirrel gets a nut once in a while!!
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post #8 of 40 (permalink) Old 03-28-2017, 08:24 PM
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Vacuum leak possibly.
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post #9 of 40 (permalink) Old 03-29-2017, 05:06 AM
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Fuel & Battery are two things that will go bad over time unused. Batt even on tender, corrosion grows on untreated connections & rubber deteriorates. Did I miss anything?

even a blind squirrel gets a nut once in a while!!
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post #10 of 40 (permalink) Old 03-29-2017, 01:44 PM Thread Starter
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Thx a lot.
Battery is always connected to Optimate Charger.
My fuel is 6 monthes old (Octan 98 - 5% ethanol included for Europe). And because of winter, water may have polluted fuel filter so... I know what I'll do this week-end.

Then, I'll check a vacuum leak. Where could it be lecated?
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