I got full boost back. I can feel it more. I bypassed the bbv solenoid and replaced every vacuum line. But mpgs are actually down. Is this normal? TIA
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06-10-2013
I got full boost back. I can feel it more. I bypassed the bbv solenoid and replaced every vacuum line. But mpgs are actually down. Is this normal? TIA
06-10-2013
Try other maintence items.
Like spark plugs, wires, new fuel filter, run some seafoam through the gas tank. Make sure to run 91+ gas.
06-10-2013
Plugs wires, fuel filter all changed between april and may 93 only since I've owned the car. I will sea foam out even though i just used some gum out. Im thinking of removing the elbow from my map and connecting the vacuum line with some small house instead
06-10-2013
What method did you use to bypass the solenoid?
You might be boosting during cruising, which would push more air in the cylinders, which the PCM would read as too lean, so it would add fuel to even out the mixture.
Since it's bypassed, replace the BBV, and hook it back up. It's like $40
Last edited by Jevik; 06-10-2013 at 11:37 AM. Reason: spelling error
06-10-2013
I want to but i can't find that or the solenoid. But i unplugged the solenoid capped off the vacuum atthe fuel rail and removed hoses from bbv to bcs
06-10-2013
You unplugged the vac line on the fuel rail????
06-10-2013
Put the BBV back.... unless it was adjusted wrong or faulty it will always let you go full boost as soon as you have less then -2 or -3 psi in the intake side of the blower. Litterally no performance gain from removing it and you WILL lose mpg. Also it puts more stress of the rest of the blowers parts because normally they are just freewheeling 90% of the time but now your forcing them under load 100% of the time.
06-10-2013
I didnt remove it. It runs from map to ubder the snout to the fuel rail it is capped at the fuel rail. When i plug in the BBV I dont get the full pull i feel with it capped. Im lost
06-10-2013
I think he did this \/ if not mistaken. I did it too, I still get 28-30 mpg on the highway though.
BCS unplugged
Last edited by TexasTanker19kilo20; 06-10-2013 at 08:00 PM.
06-10-2013
Yea thats what i did. Mpg went from 20.7 with bad T's and vacs to17.9 with hard tubing and sealed connectors. I know the rod in the BBV top hat slides in n out. But when all connected Ilost power and take off.
@ Texas do you have another pic from another angle of the BBV and solenoid?
Last edited by JPGgtp; 06-10-2013 at 05:44 PM. Reason: Left out a question
06-10-2013
Here is the thread I made about my boost problem, with all my pictures and I STILL have not figured out why it works.
http://www.grandprixforums.net/low-b...rns-71622.html
06-10-2013
That's where i got the idea. So u never used the new solenoid?
06-10-2013
Nope, it's still just sitting there doing jack sh!t. $40 engine ornament.Originally Posted by JPGgtp
06-11-2013
This is driving me crazy! Idk what to do.
06-11-2013
Is my BBV supposed to actually move or the rod that goes inside (lol)?
06-11-2013
Yes that is how it opens and closes.
06-11-2013
the bbv just needs 1 hose connected to it. Throw the stupid solenoid in the trash.
06-11-2013
So cap off the "T" at the FPR? and then Disconnect the vacuum hose from boost actuator to solenoid?
06-11-2013
Yes!!! I have a 2" piece coming off the BBV open to atmosphere.... I have my FPR capped off at the T. Runs perfect.
Here's a diagram thanks to Dan... LOL
06-11-2013
thought so thats what i did. I think my mpgs had dipped because i put a rubber elbow on the MAP when i replaced the vac lines. I was cleaning out my toolbox and had an identical one i blew through it and it was restrictive. So i think my car was running rich as a result. I replaced it with some hose off the MAP to connect it to the hard vac tubing.
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