Re: How to Clean the Air Intake, guidance required
the egr opens to recirculate when you back off the throttle and at other times.
If you do this you will need to cap off at the exhaust manifold, optional at the inlet manifold, but the most...
important of all...
disconnect the vacuum pipe and plug, this is the vac pipe that closes the butterfly on the inlet manifold.
If you don't, and also if your egr is stuck shut, the vacuum will close this on overrun, try to suck exhaust gas in, but can't, this causes excess vacuum in the inlet manifold and it will end up trying to suck from the next weekest link - the valve stem oil seals!
Only need to disconect the pipe and plug it with a screw/bolt.
The butterfly is sprung open, so nothing else to worry about.