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Fazer8 / FZ8 / Fazer 800 Running issue - With video
« on: 20 September 2023, 11:01:08 am »
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.
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!
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!