Air / oil blows out and engine revs back up

by Tim
(New York)

Hey guys,


When I stop using air and the engine idles down there is a loud rush of air and then a oily mist blows out and the engine idles up. It does not go full run rpm though. IR 175 with deutz 3cylinder diesel.

Thank you

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Mar 15, 2018
blows out
by: Doug in s.d.ca.

You mean from the intake?

The unloader (or intake valve) is either sticking, or not getting the word..it's supposed to simultaneously block air in and stop pressure/oil blowing back.

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