Misfire above 3000rpm, chamged out plus and coils already

Rotaryknight

New member
So I'm having misfiring at 3000rpm and above. Before it would do it idle and below 6000rpm, now after a while of normal operation it would do it above 3000rpm.

I changed all plugs and coil packs with brand new. Ohm them and they are within specs. Tested fuel injector and they work, dont know if its clogged. I tested fuel pump pressure and it's 40psi. It ran fine when i added fuel injector cleaner so maybe fuel injector problems?
 

LA2019

New member
Have you checked the Throttle Position Sensor? My old Yamaha GTS had "poor drive-ability" around 2500-3000 rpm. I did what you did to no avail. Finally got around to the TPS and it was out of spec.

The maximum resistance for the FZ8 TPS is 2.64 - 6.16 k ohms. If you need the pages scanned from the service manual I can upload those for you.

Good luck!
 
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