partial misfire, high fuel usage, O2 sensor voltages ok, probably injector?

[shiyan]

Currently having a misfire where the power loss is perhaps 30-40% - I can still get up to 150-160km/h on the highway but not much higher, there is the characteristic "motorbike" sound, and the fuel consumption is huge.

Spark plugs, leads and coilpack are just over a year old.

Hooked up an OBD reader from which I can see the pre cat O2 sensor voltages see to be ok - fluctuates between 0.1 and 0.8V.

MAP sensor showed 40kPa. Coolant temp showed 88 degree C.

Long term fuel trim was 37.5%

Calculated engine load was stuck at 100%

I'm guessing it's the injectors?

 

[shiyan]

Took the fuel rail out yesterday. Cranked the car over with wife's help and saw that one injector was not working.

New injector ordered. Hopefully problem solved.

 

[ripp]

hi there, how much did you paid for the injector?

 

[shiyan]

hi there, how much did you paid for the injector?

It was around 80 Euros from the Renault dealer, I was in a hurry. They're probably much cheaper if you buy reconditioned off ebay.

Changing the injector solved my problem.