Vz Calais misfiring on 2,4,6

[greigbec]

Hi just wondering if anybody has any suggestions. my vz Calais is misfiring on 2,4,6 cyl. not coming up with any errors.
only just replaced spark plugs and fuel filter three days prior. fuel filter was full of ****. runs not too bad when it is cold but gets gradually worse as it warms up. pulled spark plugs out again and found the 2,4,6 plugs were black others were fine. open too any ideas thanks

 

[richardpalinkas]

If they're black I would bet that the o2 sensor if stuffed and running rich on that bank

 

[greigbec]

If they're black I would bet that the o2 sensor if stuffed and running rich on that


Mate swapped o2 sensors over to see if it jumped banks. Checkin them tomorrow. He told me that it could be timing chain. Car has only done 150, 000.

 

[Hrd455]

If its a strecthed timing chain u will hear a rattle coming from the front of the motor

 

[greigbec]

Theres no rattle from the front of the motor. my mate checked the spark plugs again this arvo. turns out the misfiring has jumped banks so changing the o2 sensors tomorrow. will keep you informed thanks for the advice

 

[Hrd455]

Good to hear that u sorted the problem