hey, i was checking my injectors with a probe while trying to starting my fc since it wont start, but i can only reach the secondaries. and i was wondering if the secondaries work only while the car is running because i couldnt get a pulse from them? they might just be bad but i'm not too sure.

 

they come on at 3800 rpm, so you wont get anything in terms of voltage until then.

 

im pretty sure they dont do anythign for start up . just come on for higher load 4k+ rpm activities.

 

thanks that may have cost me double what i need

 

They are only fired above 3800RPM when the engine load dictates however all injectors will show 12V with the key on.

 

As long as you probe 12V to chassis ground. Injectors have a pulsed ground signal.

Rat

 

Correct, so you should show power to one side of the injector and none on the other. From my understanding of the manual, You can disconnect the vacuum tube to the boost sensor and then rev the engine above 3800 rpm and the secondaries should work.