Thread: Boost reading
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Speedy Squirrel Speedy Squirrel is offline
Rocket Scientist
Join Date: Jun 2008
Location: Detroit
Posts: 896
Originally Posted by BSKI View Post
Any way of testing the overboost sensor?
The switch is removed and a continuity tester is connected to the output spade connector and the threads. It should be a closed circuit. You then have to apply air pressure to the switch by rigging up some kind of connection to a regulated air supply. Be sure to start with the regulator set to 10 psi or less. As you increase the air pressure above 16 psi or so the switch will open and you will get an open circuit. If it has not opened by 20.3 psi it is defective and should be replaced.

I was incorrect in stating that the switch cuts of the ignition. The switch actually removes the ground to the charge air pressure relay, which cuts off the fuel pump relays and turns off the fuel pumps.
Old 03-14-2010, 09:17 PM
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