Question about 2005 Yamaha Xv 250 Virago S

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Won't rev past idle.

Start fine and idles fine.
Applying accelerator kills engine

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  • Yamaha Master
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Sounds like its time for carburator/s clean up, I think the main jets may hve dirt in them.

Posted on May 15, 2009

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Posted on Jan 02, 2017

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My Toyota Quantum 2.7GL idles but does not rev up. i ve changed the fuel pump and filter but still it starts, idles but does not rev up when you press the accelerator?


We do not have this model in US, but I assume it is a new model 2016-17. You throttle (and the "rev" ) is controlled by the computer. The fact that your car is idles - should mean that your computer is fine! There are two types of idle control: 1st- when you have a bypass of the throttle, which lets the throttle flop stay close while idling and let's the air into the motor through a bypass and electronically controlled idle switch. Inspect your throttle - the electronic/metal unit located on the large pipe through which the air gets into the motor: if you have a "bypass" for the air then you need to inspect your throttle body as it could be your problem.
2. most likely you do not have a bypass and your idle is controlled by your throttle body, then it is sure working fine and your only issue is that your engine computer does not know that you press the accelerator. Your gas pedal has an electrical unit on it which connects to the engine computer- inspect the connector/wires if all looks fine most likely your accelerator sensor does not work- you need to change the gas pedal unit ( I think it called accelerator sensor).
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What's your problem?when in idle mode it misses and carbons up until you rev the engine. black soot comes out at first and then revs clear after that but then when you let up on the accelerator back to...


Due to the amount of miles on it I would check the cat and the muffler to see if the exhaust is plugging up. It sounds like the engine is flooding and that is why you are seeing the black smoke when you rev it up. I would also check the ETC switch (it looks like a temp. sw) it sends a signal to the computer as to the outside temp and the amount of fuel need to fire the engine on start up until the idle air control kicks out.

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Wont rev past idle


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