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Discussion Starter · #1 ·
My redline stopped making boost (only around 3 lbs) after trying bypass mod realized it's the bypass solenoid that gave out.

Looking on the forum I found part #12633411
but while looking for the part I keep stumbling upon 12633355 which is listed as LNF bypass valve solenoid but also as a replacement part for the original 12633411.

Also found 1997244 as a part number from rockauto.

I'm completely confused and don't want to end up buying the wrong solenoid.

Does anyone have any idea what I should get?
 

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Discussion Starter · #4 ·
Yep 1997244 seems to be the part, I replaced the solenoid with the Standard Motor Product brand from RockAuto but it didn't fix my boost issues, the car is throwing a P0033 code. Not sure if I got a faulty bypass solenoid or wiring issues.
 

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Wonder if the diaphragm is stuck open. Have you checked the wiring by chance as well?
 

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Discussion Starter · #6 ·
Wonder if the diaphragm is stuck open. Have you checked the wiring by chance as well?
Not fully familiar with what the diaphragm being open means?

Wiring seems to be good, positive works with car on, not sure how to test ground since PCM activates it
 

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The black thing on the supercharger
 
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Discussion Starter · #9 ·
I played around with the diaphragm and wiggled it a bunch and when I drove it after it started boosting again, but stopped after about 15ish minutes of driving, any idea of a part # or how to repair the diaphragm?
 

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I believe zzp sells them. I'll look for the part number after work for you
 
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Discussion Starter · #11 ·
Yep just found it on ZZP's site, they are selling it for the cheapest I can find so far
For anyone else that stumbles on this thread:
Part # is 12591349A
LSJ Supercharger Bypass Actuator Kit - GM (12591349A)

ZZP link (2021): LSJ Bypass Valve
 
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