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Am i missing something?

AlanP

AlanP

New member
There's a module in front to the boost bypass valve that has a vacuum line running to it from the boost bypass. Just above where that hose attaches is another hose nipple that is empty. Should that have a hose attached?

Reason I am poking around is I am getting a surge in rpm when I am at low rpm and accelerate slowly. The rpms and boost gauge will bounce up and down. If I open the throttle enough to downshift the car accelerates fine. It is fine at wot... this is not a fuel delivery issue. Something to do with vacuum. Thoughts?
 


While connected it may have stretched over the years and leakes in a little air. Best test is to take some Carb Cleaner Spray and spray each connection point to every vacuum line. Go slow, 1 by 1 and if the RPMs surge up, you have a loose fitting and its leaking there.
 
Check the "T" under the S/C snout. They are known to crack and cause a vac leak, yet look perfectly fine. Until you move it that is.
 
^ This. Also where my saying to spray every connection to see if the motor revs up come into play. The slightest crack or looseness can throw off the trims enough to cause problems.
 


So for an unrelated thing I reset the pcm. The surge went away for a few hours and has slowly come back.
 
Fuel trims.

What do they say?

You've got a way to scan it via a live feed scanner? Bet they're pegged @ 16.4
 
Sounds like the boost solenoid. If I was you I'd pitch that pos and (if I remember right) run a vacuum line from the bottom BBV to your FPR and leave the top vent open.
 
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