The EPI 800 and VM 1000 manifold pressure "sensor" consists of a brass block that is pipe thread tapped for a fitting connected to the MAP source on one side and the actual pressure sensor mounted on the other side that is electrically connected to the VM computer.

 

Imbedded in the block is a porous metallic "restrictor" with the purpose of "smoothing" rapid fluctuations in the pressure and protecting the fragile actual sensor.

 

If this restrictor becomes clogged with miniscule particulate, it further dampens pressure changes so that the MAP indication does not change rapidly as pressure rises or hardly at all as the pressure drops.  At some steady state the MAP indication seems correct and the actual sensor seems to be operating properly.  I.E.  The tested pressure eventually makes it past the restrictor.

 

One of the ways to fix this is to clean the restrictor.  Here is where I need help.  Because the restrictor mesh is so fine, what chemicals and what procedure is best used to clean and restore the restrictor?  Should a vibrating parts/jewelry cleaner be used?  It cannot just be soaked and blown out.

 

Thanks,

 

Scott Krueger