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TPS (throttle position sensor) problems!

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Hey all,

I've been having problems with my throttle position sensor on my Yamaha WR450F 2005. When the sensor is plugged in the bike runs very lumpy on constant throttle and is nearly un-ride-able. 

 

In the manual, and all over the internet, there are values of which the TPS must be set at and what resistance it should have.

 

These are :

4-6 ohms resistance

0.58 - 0.78 volts

 

My TPS is set perfectly within these values, being 4.9ohms and 0.72 volts. 

 

This indicates to me that my TPS is fine and there is no point buying another? But as soon as i unplug the sensor it does run NEARLY perfect, still very very slightly lumpy but hardly noticeable.

 

Has anyone else had correct readings on their TPS but still isn't working? any help? I don't want to spend £300 on a sensor then it not actually be the problem?

 

Thanks

 

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It's a known issue covered at length in this forum.

The stock ECU is defective. Unplugging the TPS will stick it in one ignition map, instead of 'hunting' from one map to another, which causes the 'studder' symptom.

 

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Thanks for the info,

yeah I have seen alot of people talking about it but not anyone with correct sensor readings.

Would you know of any ECU's which are a straight swap with my WRF?

 

Thanks again

 

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1 hour ago, Harry T said:

Thanks for the info,

yeah I have seen alot of people talking about it but not anyone with correct sensor readings.

Would you know of any ECU's which are a straight swap with my WRF?

 

Thanks again

 

Vitrually none, because ALL the early YZ's have the same problem, and later YZ ECU's won't work.

http://www.dynaonline.com/

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