Hey guys i was wondering if the secondary injectors need a load to activate or do the just kick on at an 3800 rpms?
Thanks
Brian

 

no load necessary.

 

Yes. You need to have a load and be over 3800rpm for the secondarys to come online.

You can sit in your driveway and rev to your hearts content and they won't come online.

There is a way you can make them come online in the driveway. Read and follow the FSM. All you have to do is disconnect the vacuum line from the pressure sensor and cap that line. Then each time you rev over 3800 rpm the secondarys will come online.

 

Make the copmuter think theres a load thanks a lot i had looked through the fsm but didnt catch that
thanks

 

Yeah. First warm the engine fully up. Then, first, for a comparison, slowly rev the engine to say 4500 rpm. It should rev smoothly. Do this prior to unplugging anything at all.

Now pull the vacuum line off the pressure sensor. Now rev the engine slowly once more to 4500 rpm. You'll notice a bit of a stumble at the 3800 rpm mark. Can't miss it. In fact at 3800 rpm it'll run kinda crummy til you rev much higher.

The 1987 FSM for non turbo cars mentions this in a checkout of the secondary injectors. It has you disconnect that pressure sensor and plug the vacuum line. Then rev above 3800 rpm and listen with a stethoscope, to the secondary injectors for pulsing. You can skip the stethoscope part altogether.