90 - Running out of breath at 5000 - No Codes

[scottfab]

Originally Posted by dondon

....snip....

My gut feel says and the secondary vacuum number is the big clue, does anyone know perhaps if it stays at 0 kpa like mine does, and at which point that changes. ie does it change when the secondary pump charges the system or some other time. All I can think is something under the GD plenum is preventing Vac from getting to the Vacuum sensor under the ECM... there may be other issues as I recently replaced the solenoid, reservoir tank and spider hoses... so who knows.

There is so much info on this forum about the code 61, you would swear I was deaf to something or overlooked something.

I'm going to propose a negative test. That is a test where you force a failure and see if the outcome is what is expected. Pull the power to the vacuum pump and go for a WOT. Do the secondaries pull at all? When does it give out? (in rpm)
If the only vacuum to the actuators is the pump then the secondaries will not pull in at all.