Hi ,a few weeks ago my truck had misfire on cylinder #8 and the OBD also said SYSTEM TOO RICH.

I changed the coil #8,nothing changed.

I changed all spark plugs,nothing changed.

Today i changed all other 7 coils and.....nothing changed!!!!!!

The truck still only runs like only on 4 or 5 cylinders.

I don't know what to do,really need your help....

Thx.

 

have you or anyone else checked the injectors? i know 05's had the problem but i'm not sure if the 06's are completely safe from that problem. and is the fail safe mode or limp home mode light on?

 

No ,no lamp on on the dashboard.

I thought about the O2 sensors,what do you think?

 

i dont think that would cause it to miss on all those cylinders. hopefully jmc gets on here. he'd probably know what it is off the top of his head.

 

Can you send him a mail?