Stumblin Bumblin Z

[tomtom72]

Originally Posted by 1963korvette

Yes, the vacuum pump is working, although it is squelling. I also checked the rest of the system and it holds vacuum nicely.

The motor bearings may be dry in the vac pump. Not to be a wise guy, but when you say the system holds vacuum nicely did you do individual checks while you were under the plenum doing your injector work? Or are you using the connection from the vac pump at the right bank? I'm asking because sometimes you have to rotate the actuator canisters so that the arms move freely when vacuum is applied. They should be fully open between 6" & 8" Hg, and their movement should be smooth and linear, not choppy.

Some of the symptoms mirror a DTC 61: secondary vacuum failure. Is the motor still resisting that 3k rpm barrier? That is what happens with a DTC 61. The cause could be a leak, a bad secondary MAP or it's hose, bad tank, bad check valve ( doubtful ), leak in the plastic tubing or at either of the actuator canisters, leaking 2* solenoid.


Tom