Bikes, Hints'n'Tips > Fazer8 / FZ8

Fazer 800 Running issue - With video

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Jhooch:
Hi guys!
 
Looking for some input on an issue I have with my 2012 Yamaha Fazer 800 14,00 miles. I bought it with the issue I’m trying to fix. I have no history on the bike, the dealer I bought it from couldn’t fix it.
 
Check out the video of my issue - http://youtu.be/50X8uXyvpzE?si=qrf3s8njx5ULxREP
 
Originally the fuel pump would be working all the time when you key on, then while running it would have inconsistent revs as shown. With the fuel pump relay not switching off, I fixed this buy getting a used ECU. I thought perhaps it would fix both issues but it didn’t. (I haven’t yet flashed this ECU to my lockset, I’m using an emulator until I can actually get the bike running correctly)
 
I have no fault codes on the dash, and I have tested the following.

* Intake Air Pressure Sensor
* Air Temp Sensor
* Cam sensor
* Crank Sensor
* TPS
* Secondary TPS
* All 4 coils
* Atmospheric pressure Sensor
* Fuel pump pressure (Sits a 3.0 bar while the issue is happening)
* Fuel pressure regulator (Changed it just to be sure)
* Engine Temp Sensor (As shown the revs do come down as the bike gets hotter)
* Balanced the throttle bodies (Spot on, no need to adjust)
All parts are within spec or either operate to the genuine manual.
Diag tests on the speedo all show and work correctly.
The spark plugs are sooty, so it looks like it’s over fuelling. The bike as far as I know is completely standard. Has standard exhaust, air filter and as both ECUs are showing the same symptoms, I doubt they have been both mapped.
 
But as the video shows the tacho jumping everywhere, it does feel like it’s missing, pointing to an electrical fault. But with all plugs being sooty, I can see a plug/coil braking down.
I have already checked multiple forums for a fault like this but had no luck.
 
Is this an issue with Fazers you seen before?
 
Any input would be greatly appreciated, maybe I’m being a fool and missing something obvious here!

agricola:
Tickover looks way too high to me, should be around 1000 to 1250 I reckon. Also, when you turn the key on, Ibelieve that you have to wait for the tacho needle to sweepm all the way to max revs and backm to zero, to allow it to complete the systems check. Have a real good close look at the rubber sleeves on the injectors to make sure they are all seated correctly

unfazed:
Sounds like your fast idle plunger sticking.

Jhooch:
Appreciate the response guys.


Sorry for the slow update, been super busy.


I've changed the throttle bodies (And all attached sensors) and fuel pump (Pump itself and the regulator). However I still have the same issue, exact same symptoms.


My next step is to check the valve clearances, however with the bike only doing 14K I'll be very surprised if they're out.


If you have any other suggestions I'm all ears.


Will update soon!


 

unfazed:
Will the idle not drop if you adjust the idle adjuster? I assume not since that is the obvious first step to check.Did you reset the ECU? It is a learning ECU.Did you check the fuel line pressure? Should be 47PsiWhen you tested the items did you check the wiring connection back to the ECU? Did you check the Multi point earth which is prone to corrosion?Was the fast idle included with the replacement throttle bodies, is it adjusted properly and is a common source of high idle issues.
Has the TPS been set correctly?Did you try disconecting the O2 sensor?

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