Vespa primavera rough Idle and can't turn the throttle
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Lurker
Vespa primavera 2015
Joined: 20 Jan 2021
Posts: 3
Location: Malaysia
Wed Jan 20, 2021 11:04 am quote
I have a modern primavera 2015, my scooter can start but won't move when I'm turn the throttle.... I just change the throttle body to the new one... Can anyone help me solve the problem
Tattle-tale
2007 LX 150 (memories)
Joined: 12 Jun 2007
Posts: 8351
Location: New Hampshire
Wed Jan 20, 2021 11:56 am quote
Did it move before you changed the throttle body?
Lurker
Vespa primavera 2015
Joined: 20 Jan 2021
Posts: 3
Location: Malaysia
Wed Jan 20, 2021 12:11 pm quote
No it not... It also not move before... I thought it was the throttle body that broke so I change it
Tattle-tale
2007 LX 150 (memories)
Joined: 12 Jun 2007
Posts: 8351
Location: New Hampshire
Wed Jan 20, 2021 3:30 pm quote
Can you roll the throttle hand grip? Does it move? Can you look at your throttle body and find the cable that operates when you roll the throttle? Is it there? Does it move? Is it connected?

I ask because your header says you can't turn the throttle but your narrative says you turn the throttle. Just trying to sort it out.


"Vespa primavera rough Idle and can't turn the throttle"

"my scooter can start but won't move when I'm turn the throttle."
Lurker
Vespa primavera 2015
Joined: 20 Jan 2021
Posts: 3
Location: Malaysia
Wed Jan 20, 2021 8:14 pm quote
The cable is connected and the the throttle move but the tyre won't move when I turn the throttle...the engine dead when I turn the throttle.. Is it possible the fuel injection broke?
Hooked
S150, Beo 500ie
Joined: 14 Aug 2019
Posts: 440
Location: Bermuda
Thu Jan 21, 2021 4:11 am quote
You need to be ruthlessly methodical about this. If you throw random parts at it you'll never get it fixed. Engine not responding to throttle if the butterfly valve is moving in the throttle body could be a problem with fuel, or compression, which is easier to check. Does the engine stall? If so, spark could be the problem too.

Are you seeing a check engine light?

Don't the throttle bodies have to be paired to the ECU for proper idle speed? Replacing that would have been a LAST resort in my book, after replacing the fuel injector, but even that would be pretty far down the list.
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