@vince

[hiroler]

I unplugged both o2 sensors and it still has the same missfire do you still think it could be an o2 sensor?? I will take one in to work see if they can match it with a universal one.

[hiroler]

I have changed the o2 sensors but no luck still have the missfire problem!!!!! Any idea where to look next??

[BUSHWHACKER]

Did you do a road test with a hot engine and the sensors unplugged?


EDIT: Did you reset the ECU?

[hiroler]

Not with the engine hot and unplugged but I did road test with the new sensors up to temp and it's just the same, I have not re set the ecu I will give that a try.

[BUSHWHACKER]

The o2 sensors don't do anything until the engine is up to temp.

[hiroler]

As it does it from cold would that not indicate the it's not the o2 sensors??

[BUSHWHACKER]

As it does it from cold would that not indicate the it's not the o2 sensors??

They are still part of the 'system' but don't start sending info until the engine is warm.

(if that makes sense?)

[hiroler]

So I will re set the ecu tomorrow and see if that sorts them out! Anything else it could be! Can only be fuel prob now surely??