Mon May 31, 2021 10:10 am

Member
piaggio mp3 500
Joined: 02 Apr 2021
Posts: 10
Location: Netherlands
 
Member
piaggio mp3 500
Joined: 02 Apr 2021
Posts: 10
Location: Netherlands
Mon May 31, 2021 10:10 am linkquote
Hi guys,

Yesterday me and my wife made a long trip trough Germany with our MP3 sport 500 ,14 with 43000km.

After 100 km my check-engine light went on and off, most of the time between 4-5000 rpm. when throttled back it goes off. Also the maintenance belt and service went on 3/4 of the trip.

After reading one of the topics here i checked the voltage regulator and a reset at the maintenance symbols. (Already did it a view weeks ago)
Made a test drive again tonight. After 30 km of highway the light came on again before a red traffic light. Then the light get trigged again around 4-5000 rpm.
The check engine seems to stay on longer now.

Any ideas?

cheers
Roel
Mon May 31, 2021 10:22 am

Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
 
Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
Mon May 31, 2021 10:22 am linkquote
3 possibilities (in order of likelihood)

Battery end of life
Oxygen sensor end of life. Only use premium fuel from a top tier supplier (Shell, Esso/Exxon, Texaco, etc.) for maximum o2 sensor and injector lifespan
Voltage regulator gone bad. It is not the volts, but the amps that count and can kill components.
Mon May 31, 2021 11:13 am

Member
piaggio mp3 500
Joined: 02 Apr 2021
Posts: 10
Location: Netherlands
 
Member
piaggio mp3 500
Joined: 02 Apr 2021
Posts: 10
Location: Netherlands
Mon May 31, 2021 11:13 am linkquote
Battery, Sparkplugs, Air filter, Oil, coolant, belt and Dr pully's are new.
Voltage regulator checked with multimeter doesn't exceed 15V

Then the OS sensor ( can i measure it?

I had 2 bangs from the exhaust and this mp3 uses more fuel then the one i had before. maybe the fuel mixture is not correct. I always go to shell fueling the right gasoline. can the fuel injector be faulty?

I checked the coolant and had to add 0,25L Didn't checked after the repair. Also the cap wasn't air tight because i wanted to check the level later on Could that be the problem?
Mon May 31, 2021 12:28 pm

Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
 
Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
Mon May 31, 2021 12:28 pm linkquote
15V is too high, you start damaging electronics & batteries at this voltage. The voltage regulator should max out at around 14.7V.

If you had backfires, and you have excessive fuel consumption then I'd invest in a new oxygen sensor before anything else. If no change, then invest in a new voltage regulator. Also measure the 3 phases coming off the stator, as this critical to having a healthy charging system.

Fuel mixture is under full computer control and cannot be adjusted.

Sounds like the coolant cap might be worn out or simply loose. I'd replace that too. Mine consumes zero coolant.
Tue Jun 01, 2021 1:13 am

Member
piaggio mp3 500
Joined: 02 Apr 2021
Posts: 10
Location: Netherlands
 
Member
piaggio mp3 500
Joined: 02 Apr 2021
Posts: 10
Location: Netherlands
Tue Jun 01, 2021 1:13 am linkquote
A few weeks ago i replaced the Reed Valve. and the waterpump casing. that's why the coolant was low.
But it is a good idea to replace the the cap because I need pliers to open and close it

I can measure the the voltage regulator again but I'm sure that it doesn't exceed 14.7V.

It smells like the o2 sensor is faulty.

Google says
‎To the ‎‎lambda probe‎‎ check the voltage on the signal wire (usually black color). Usually, when the engine is warm and in normal operation, the measured value should be ‎‎at 2000 rpm to fluctuate approximately twice per second between 0.1 and 0.9 volts.‎

Ill try that first after work.
Tue Jun 01, 2021 12:19 pm

Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
 
Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
Tue Jun 01, 2021 12:19 pm linkquote
Be aware that simply replacing the oxygen sensor will not turn off the check engine light immediately.

You will either need to reset the fuel trims in the ecu (through the software tools) OR drive the bike on several cycles to allow the ECU to bring down the fuel trims.

And lastly, be sure to check for vacuum leaks by spraying carb cleaner on all intake parts and see if the idle changes including tightening the screw clamps on the intake snorkel.
Tue Jun 01, 2021 1:27 pm

Enthusiast
2019 MP3 500 Sport
Joined: 26 Sep 2012
Posts: 71
Location: California
 
Enthusiast
2019 MP3 500 Sport
Joined: 26 Sep 2012
Posts: 71
Location: California
Tue Jun 01, 2021 1:27 pm linkquote
This is just me, but I'd just take the bike to the service center.

These days, there is a plethora of stuff you can't fix yourself.

Once my bike is out of warranty, I'd do the basic oil change bull in a local shop, but I'd still do the major stuff at an official shop. There's a difference between real service to keep you vehicle like new, or simply allow it to limp on.

My BMW R1100S is over 20 years old. Runs like a new bike. Major service always performed at the dealer, and yes, it is costly.
Wed Jun 02, 2021 12:31 am

Member
piaggio mp3 500
Joined: 02 Apr 2021
Posts: 10
Location: Netherlands
 
Member
piaggio mp3 500
Joined: 02 Apr 2021
Posts: 10
Location: Netherlands
Wed Jun 02, 2021 12:31 am linkquote
OS sensor is not broken and gives 0.9V at idle.
Yesterday before driving home i had a leaking airfilter. Lots of oil came out.
Soon i will visit Maksor for a diagnose.
Wed Jun 02, 2021 3:24 am

Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
 
Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
Wed Jun 02, 2021 3:24 am linkquote
Oil in the airbox means the engine is overfilled.

Piaggio wrongly states a capacity of 1,7L while the actual refill capacity is 1,5L
Wed Jun 02, 2021 7:43 am

Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
 
Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
Wed Jun 02, 2021 7:43 am linkquote
PabloLie wrote:
This is just me, but I'd just take the bike to the service center.

...

My BMW R1100S is over 20 years old. Runs like a new bike. Major service always performed at the dealer, and yes, it is costly.
As nice as that sounds, that is not always a option especially with Piaggio/Vespa who treats the Americas (i.e. the US & Canada) as a dumping ground for bikes they can no longer sell in other markets i.e. mainland Europe.

Dealer support is sparse at best, and the dealer network is a leaf on a vine.

Piaggio is a niche brand in the US compared to the Japanese brands. And unlike Piaggio, you get real dealer support in just about every half sized town plus bikes that are built to last 20 years without the high maintenance needs of Piaggio's products. Example: I can order any part for any Honda built since 2000, while Piaggio parts i.e. accessories are NLA (No Longer Available) after only a couple of years such as the Piaggio branded Bitubo shocks.

BMW = Bring My Wallet
Sun Jun 06, 2021 9:49 am

Member
piaggio mp3 500
Joined: 02 Apr 2021
Posts: 10
Location: Netherlands
 
Member
piaggio mp3 500
Joined: 02 Apr 2021
Posts: 10
Location: Netherlands
Sun Jun 06, 2021 9:49 am linkquote
Hi Guy's

All wrong!
OS sensor went creasy of the oil we think.
All 3 piston rings were broken.

replaced.
New cylinder piston and rings. Injector was faulty.
All parts cleaned and adjusted valve rocker clearance.

Thanks Nico

Knock on wood that this was it all for now!
Sun Jun 06, 2021 9:07 pm

Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
 
Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 398
Location: Belgium
Sun Jun 06, 2021 9:07 pm linkquote
Broken piston rings + bad injector = bad fuel source
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