Strange fueling problem

[Morcs]

I have an 04 Naked.

It has this strange problem that sometimes at the lights, the idle goes really rough, and unless I hold the throttle on a wee bit, will cut out - and then restarts fine but the problem persists.

It also has a problem that sometimes when spending a fair bit of time (like 5-10mins) at a constant low speed (like 30mph) the power delivery is real jerky - on a constant throttle, like something is cutting in and out really really fast.

After a bit of open throttle, the idle is fine, and also the problem happens at normal running temperature.

I did read about a recall some time ago due to something that caused these problems, but I remember that the 04 wasnt affected?

Everything is standard except leovince ovals, and airbox mod.
Any feedback or info on this issue would be greatly appreciated..

Cheers,

Pete

 

[Morcs]

Just went to check the TPS, got it into Diag mode, but when I press select all it does is alternate between 'diag' and 'Co'

 

[scottsst]

what do your spark pulgs look like if you bike is running rich they could be fouled out . also when your bike at a normal idle does it seem kinda low

 

[tuningfork]

I would guess that it is the TPS sensor...either it has gone bad, or some combo of throttle body sync-idle speed-and TPS voltage setting at idle. I would download the service manuals from this site and check these three conditions.

Maybe check that all of the vac lines are in good condition as well.

 

[[email protected]]

most of the uk bikes were recalled for faulty tps,just thought id let you know

 

[jdough7]

"Didn't you get the memo about the TPS reports?"

 

[Sawblade]

Just went to check the TPS, got it into Diag mode, but when I press select all it does is alternate between 'diag' and 'Co'

Try holding the buttons down for an extra 5 seconds.

 

[Morcs]

Did that cheers, TPS reads 16 - 100 so all good.

Just did the Co mod, +20 +20, will see how it goes.

 

[Morcs]

No real change on the way home, the problem still persists.

After about 15 minutes of city riding it kicks in, whenever I ease of the gas at all (like even just a fraction) the pipes let out a continuous burbling/crackling, yet if I close the throttle completely off, there is no crackling at all (unless in 1st gear)

Im a suspended driver at current, but have a work license. I use the Fazer for the commute once a week to keep it in use, and with my license situation im on uber good behavior, so wont even chance a quick squirt high in the revs.
Because of this, I do believe it to be plugs - the bike needs a good thrashing to clear them out!

Any other thoughts?

 

[scottsst]

I don't know how it works down there but if you can go to a drag stip on a test and tune night I would . put some good fuel in it and make a couple passes on it really let it rip if you do think thats what the problem is that could be a quick fix or you could just change them but thats not as fun is it

 

[Yatz86]

check ure idling is within the recommended range as per manual

 

[Fz6Sa]

Maybe I'm wrong (if so someone please correct me), - but did not Yamaha recall the TPS on the 04?
Did you get yours replaced?

 

[Boneman]

Maybe I'm wrong (if so someone please correct me), - but did not Yamaha recall the TPS on the 04?
Did you get yours replaced?

Yup they did. Got mine replaced on my 04 free of charge! I know you checked it with 'diag mode', but I would call your dealer and get them to check you VIN #. heck, even if it hasn't been done, I would take it in and request the TPS repair due to the recall anyway, just to be sure.

 

[Morcs]

So I could potentially get it done free of charge even though the warranty long expired?

awesome!

 

[TownsendsFJR1300]

When you checked the TPS did you check to make sure the #'s inbetween were linear and did not skip any digits (by both slowly opening and closing the throttle)? Any skips in digits would be a faulty TPS....

 

[Boneman]

So I could potentially get it done free of charge even though the warranty long expired?

awesome!

Yes. It's a factory recall - warranty has nothing to do with it.

 

[Morcs]

When you checked the TPS did you check to make sure the #'s inbetween were linear and did not skip any digits (by both slowly opening and closing the throttle)? Any skips in digits would be a faulty TPS....

I did, but not purposefully, will do it tonight.
Will ring the yammy dealer I bought it from and ask them to do it

 

[Morcs]

I checked the TPS as above, alll good.

Changed the plugs, put iridiums in. Old plugs were very oily!

changed the CO's to +24, and upped the idle a bit.

Runs smoother now, much quieter too. Wont know for sure til on the way home when its warmer outside, as thats when the problem tends to occur.

I will get my dealer to run the chassis number to check if the TPS was done, and coincidently, in the fault code history, there is a 15 there...

 

[MarinaFazer]

whatever you do - DON'T POUR NOS ENERGY DRINK IN IT!!! :rof:

 

[chemicalsmile]

hahaha. especially not two of them, that turns it into jet fuel.