zr1 SECONDARY PORT VACUUM ACTUARY

[janozr1]

Anybody want sell to me or tell me where can buy part #1996743 ???
thanks,Jano

GM should still have them. But the failure rate on brand new ones is roughly 75%. I typically will order a dozen at a time.

[janozr1]

yes , it is true I chaned them 12kmiles ago , and both are now with holes , they are made in mexico i think so I didnt want to belive ----AGAIN same mistake under plenum , but it is also true that Im running with haibeck chip all the time on 400hp....
Kurt save me again =D>
Jano

[Pete]

Just take the complete secondary system off and you won't have to worry about finding or buying expensive parts.

Problem solved.

And you will pick up about 6-8 horsepower with no driveability issues.

[kenthompson]

Without pulling the throttle blades, what do you do? Wire the blades open?

[janozr1]

just blades open and disconetting vaccum ? What will ECM say ?

[Pete]

Take the blades out,take the shafts out,plug the holes with freeze plugs,
send chip to Marc H. to eliminate secondaries or run the vacuum pump hose to the one side of the secondary solenoid closed side then run the open side of the secondary solenoid to the differential MAP sensor under the ECM,no codes and no more headaches,even with the above mentioned you will still need to send the chip to Marc H. to reprogrm it for the secondary key to always stay ON among other things.

Pete