Anybody know what the black box thats on the bottom right hand side of the rocker cover is for ?
Ive only seen other astras with a pipe there no box ?
any ideas ?
most likely the EGR.
breather mod i think
done under warrenty iirc
EGR = Exhaust Gas Recirculation,
this valve opens up and releases harmful exhaust gases into the throttle body to be burnt with the intake air to minimise the amount of harmful emissions vented into the environment. In simple - ditch it if u can!
actually it uses the exhaust gas to dilute the air/fuel mixture. it lowers the combustion termperature enough to reduce harmful nitrogen oxide emmisions.
its nothing to do with recycling exhaust gas, its just a good source of inert gas (required for the above process)
odd ball is right is is there to help reduce emissions (get u through the MOT), but ocasionaly causes problems as the engine wears. ocasionaly the engine performance can be improved if it is messing around by sealing off the EGR but u shouldent mess with it unless its giveing u jip, it could meen the differance between passing with flying colours or failing ur MOT.
we shouldent internalise these externalities!