Jump to content

Yamaha Spark 115i - EFI issue? Keeps stalling in idle, won't start


Recommended Posts

Posted

It began yesterday, when this kick-start only model coughed and then died. A few kicks later, it ran and a kilometer later, the engine stalled again at a red light. Back home, it stalled at the gate. This time, it wouldn't start at all.

Dirt in the injection nozzle? EFI electronics? Am stumped. And not at all mechanically minded.

Fuel consumption appears to be way too high as well.

Often, issues are model-specific. Hope someone will be out there who experienced the same issues?

Cheers!

Posted

you did have bike blessed by monk when new, right?

or

maybe a yamaha thing

my nouvo did same after using 4.2 liters from tank.

okay after adding fresh fuel.

[not E20, E80 nor diesel]

if not, mechanic should √ & blow job to: injector, tank, valve, line(s) & filter

√ spark plug & lead

still no va?

chip

on the odd chance you are in Pattaya,

papa can recommend cracker-jack mechanic.

Posted

idle may need to be reset. Had a bike that did this before. Mechanic fine tuned the idle. Fixed it.

Posted

My advice is to check the simple stuff first before looking at more complex and expensive things.

Firstly check in this order, spark plug, air filter, battery condition, fuel filter and, if it has done more than about 20,000 km, valve clearances. Problems with one or more of these components can cause the stalling and difficult starting you describe.

A light tan colour is normal spark plug. A black spark plug indicates running rich = too much fuel.

If those items all check out good then my next suspects would be the lambda sensor or the engine temperature sensor. The reason I suggest looking at these two components is because you say fuel consumption is way too high which suggests the bike is running rich. If a lambda sensor fails most engine computers default to running rich in the absence of data from the sensor. The engine temp sensor is, in these simple bikes, used as the equivalent of a cold start device. Cold start device = old school choke = throw more fuel into the engine. In the absence of data from the temp sensor the engine computer most likely defaults to a rich setting. Another reason for looking at the engine temp sensor and lambda sensor is because these can be diagnosed using a multimeter (a common electrical test tool).

Beyond that would be throttle position sensor, engine computer and other stuff.

For now I would not attempt to mechanically alter the idle. You can bet it was right out of the factory and in messing with it you would most likely be seeking to compensate for a problem elsewhere. Fiddling with it would require re-calibrating the throttle position sensor and I hazard a guess that most mechanics don't know this.

It could be numerous other things but the key is to have someone work through the steps logically without a bias towards selling you expensive bits such as engine computers and sensors.

Posted

Thanks - am deeply grateful for the excellent advice!

Found the cause, there was oil in the fuel, clogging the injector nozzle. Fresh fuel diluted it further and this stopped the symptoms.

Posted

Thanks - am deeply grateful for the excellent advice!

Found the cause, there was oil in the fuel, clogging the injector nozzle. Fresh fuel diluted it further and this stopped the symptoms.

Curios.

How was oil in the fuel clogging the injectors diagnosed?

Somebody in the family have a chain-saw or sumfin?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.


  • Topics

  • Latest posts...

    1. 80

      U.S. Senators Introduce Legislation to Counter UN Actions Against Israel

    2. 6

      Thai Tesla driver admits reckless driving after argument - video

    3. 110

      Who's Gonna Win The Tyson Fight?

    4. 5

      Thailand Live Wednesday 20 November 2024

    5. 6

      Thai Tesla driver admits reckless driving after argument - video

    6. 20

      Tourist Hits Pattaya Street Sweeper, Attempts to Flee but is Captured by Bystanders

    7. 84

      New Alcohol Control Bill Nearly Finalised; Set for December House Vote

    8. 0

      UK Faces Diplomatic Tightrope Amid Potential Trade War

  • Popular in The Pub


×
×
  • Create New...