I don't think that is your issue. If it were you would be over 11-13 PSI. Read other thread.
I don't think that is your issue. If it were you would be over 11-13 PSI. Read other thread.
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
Weird how the GM test procedure warns not to use 12 volt?
I need to build another test bench to have one running all the time, becuase this one is down half the time while building systems...
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
If the IAC motor is a stepper motor (and I think it is), GM probably doesn't want techs to simply apply straight 12V to the coils and then think it's bad because nothing happens. A stepper motor has to be fed a specific type of signal in order to make it move.
Familiar with 1227747 and 16197427 PCMs
pulse it at an 80Hz frequency with 12 volts and it will move as it is supposed to. i imagine the average tech (at least back then) wouldn't know what to think of a little IAC motor that moves an almost invisible fraction of an inch when power is applied, then when they remove power and reapply, the same tiny movement.
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