And what does it look like?

The sensor you may need to clean is the manifold pressure sensor. Its mounted on a bracket, next to the suspension turret, on the drivers side (RHD car). The sensor is a small black box with one pipe going into it.

Remove the sensor and clean the internals with aerosol brake cleaner.

The wastegate solenoid sits below this sensor and has either two or three pipes connected to it, depending on the year of car.

Personally, I would clean all of the sensors in this area and, one by one so you don't get lost, clean out all the pipes feeding them.

This will nearly always cure a sudden attack of "over boost syndrome".

It is also very important that you get the solenoid to cycle by conecting the two green connectors underneath the steering column, this therefore cleans the connectors inside the actual solenoid.

If you take the solenoid off, then simply remove the pipes and as Pete says, spray brake cleaner down them. Then spray brake cleaner into the two/three (depending on year make etc etc) of the solenoid.

Look under the steering column, up by the brake pedal...there should be two wires with green conection ends un-connected, you will hear the fans cycle a few times over and over again, you will also hear the wastegate solenoid ticking (working its cycle)...spray the brake cleaner in the pipes and watch all that crap come out....be carefull with the induction kit if you have one and watch the paint work etc etc....wipe up all the residue. (the ignition needs to be actually turnt on to do this and peform the cycles)

You will then find that you actually have cleaned the solenoid outr totally and the pipes...not just the pipes, because the contamination can come from being overfilled with oil and the solenoid gets clogged.

I had an issue with an overboosting WRX peaking at 1.6 bar and holding at 1.4, then dropping off etc etc! http://bbs.scoobynet.co.uk/eek.gif and thankfully my suspicions were confirmed when I performed the cleanse!

Hope this helps

Kind Regards.
RonnieH

Thanks for the info. It's very much appreciated.

Your welcome.
Ronnie