2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

What to do with this vacuum line

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Old Jan 10, 2023 | 09:05 PM
  #1  
Stussy's Avatar
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From: North Dakota
What to do with this vacuum line

I am switching to a stand-alone ecu, and am deleting the efi harness. What happens to this?


it is the check value that goes to the switching actuator. Since the efi harness is disappearing, the connector for this valve is gone. Can I directly put it somewhere? Also, if I delete the omp system, is there going to be any connected vacuum lines to the nippled by the throttle body?
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Old Jan 11, 2023 | 09:45 PM
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TerryD's Avatar
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From: Toronto, Ontario
I say bypass the solenoid, keep the check valve. Back when i had s4 turbo setup, I bypass it, all it does is keeping the flap in the exhaust manifold partially block during lower rpm to aid in spooling. you can actually hear it switch when cruising on the hwy. For me with free flowing exhaust, it got louder when it opens up, which got annoying when it open and closes while hovering around rpm it switched at. (forgot if it was around 2500rpm) With it bypassed, cruising around in vacuum, the car quieter and louder when you step on it.
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