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-   -   93 SSEI superchager boost question (https://www.gmforum.com/forced-induction-105/93-ssei-superchager-boost-question-262335/)

chadly 08-10-2007 10:54 AM

93 SSEI superchager boost question
 
i am getting around 2psi of boost and no more i wiggled some vaccumm lines and took it for a ride and all a suddin 8-10psi i was like wow! i scanned it and got a bad speed senor on pass side and code 56? i dont kno what code 56 is but maybe thats the problem? it is so slow but runs fine.

chadly 08-10-2007 10:55 AM

and the 8-10psi boost lasted for 5 seconds and wont come back.

J Wikoff 08-10-2007 11:12 AM

I think it's all still related back to this:

http://www.bonnevilleclub.com/forum/...hlight=#923922

willwren 08-10-2007 11:14 AM

Code definitions are in Techinfo. Link at the top of the page.

At idle, please pull the vacuum line off the top of the BCA (boost control actuator) which is the round black cylindrical thing mounted to the front of the SC. Does the arm move back and forth as you pull and replace this vacuum line? Does it move FULL travel distance?

chadly 08-10-2007 11:21 AM

yes it moves when i pull it off ,and when i put it back on ,it goes back to normal
the bcs i think is fine. i revved it up full blast and still the 1 notch past the zero mark,wich i am guessing is 3 psi

J Wikoff 08-10-2007 11:24 AM

Pull the bottom line of the cylinder than drive it. How much boost do you get then? If you get more, than the BCS (little box with the electical connector) is bad or the PCM is making it dump your boost because you run non-premium fuel.

If you don't get more boost, your BCA (the cylinder) has a leak or the vac line leading to the top does.

chadly 08-10-2007 11:25 AM

ok at the very top of the bcm, when i pull the vaccum line off it does nothing ,the one on the side makes the arm move ,so is it bad?

chadly 08-10-2007 11:27 AM

ok there is one vaccum line on the bottom of the bcm, then there is one missing so i guess it is suspose to be like that i am going to drive it with the one off and see what happens.

J Wikoff 08-10-2007 11:28 AM

BCM? BCA (cylinder) or BCS (little box)... Each has two vacuum lines. The one on the bottom of the BCA should just be an elbow that goes into the BCA.

And the BCS will have an empty port (that may have a little foam filter on it) in front of the elbow port. Leave it empty.

chadly 08-10-2007 11:37 AM

ok i took the bottom line off and i get almost 8-10 boost can i leave it like this?
thanks alot for helping me

J Wikoff 08-10-2007 11:40 AM

I would not leave it like that until you fill the tank with 91 or better fuel and get it scanned to see if the PCM is dumping boost on purpose. Or if you wanted to spend ~$40 on a hunch, get a new BCS (boost control solenoid). Some places may call it simply a "valve kit".

chadly 08-10-2007 11:40 AM

i ment the bca cylinder sorry.

chadly 08-10-2007 11:41 AM

i scanned it with the new code scanner all that came up was passenger side speed sensor and code 56 the book didnt say what code 56 is

J Wikoff 08-10-2007 11:45 AM

I meant a live scan (with a full scan tool) while driving. Goose it. There should be a parameter "boost %" or "boost duty cycle" or something like that. If it doesn't say 100% when you are hard on the gas, the PCM sees a problem and is dumping boost on purpose. I can look at my PSM later when I get home to see the diagnosis of code 56.

If it always says 100%, but you don't get 100% boost, you need to get a new BCS.

chadly 08-10-2007 12:02 PM

ok i found the bcs and i am going to the junkyard they have a 95 ssei supercharged hopefuly its the same and ill try changeing it, i appreciate it alot! i am very happy i have boost now!

chadly 08-11-2007 08:46 AM

THANKYOU ~J WIKOFF~ IT WAS THE SEILONOID now the car goes great i appreciate it alot.

J Wikoff 08-11-2007 11:24 AM

Anytime. ;)


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