All,
I found that the vacuum line going form the manifold to the SC bypass controller was binding the SC bypass valve. After moving the vacuum hose to a new location I can now reach the 12.5 PSI on the boost gage. I have also notated that the boost response has gone up after moving the line. The vacuum line was starting to get a hole in it so I will get a new one form the dealer.

I think every one should check this out on their 2.0 S/C.

1. Look at the diagram on the underside of the hood. The line that is going from the intake manifold to the controller is the suspect line. It will bind up and be worn by the SC bypass valve and fuel rail. I do not have a picture at this time but it should be easy to find if you look in the location that I described.

I hope this helps and if this has been found berfor then surry for the repeat info.

I took the fuel rail plastic cover off and pulled the line out of harms way. I will re-rought it later.

 

Just checked mine, vacuum line is 90% worn through also, good idea for all to check. Thanx for the heads up Geo !

Steve.

 

can somone please take a picture of this?

 

Yes, I was thinking the same thing, if someone could take a pic it would help greatly I'd really like to check mine.

 

Thanks for the heads up. I whent out to check mine just now and there was just a very small amount of wear. Now that I have it moved a little bit it souldent wear anymore. Again thanks for the heads up!

 

I do not have the ability to take picture of this issue. It should help all with preformance if you move the vacuum line. I discribed it as best as I could but a picture would be better to help other people find what I am talking about.

 

Well i'll be damned! Hes right! my line damn near rubbed clean through. I'm ganna have to go get a new hose in the morning. Good looking out with the hose thing pays to check the forum

 

I believe this is the point in the line GeoChevyCobalt is talking about (The one the arrow is pointing too... Not the white striped line).... Sorry about the size and what not of the pic... Had to downsize and adjust quality to meet websites upload constraints ! I only have 2800 miles on my SS ... My vacuum line was bound up and starting to rub through just SLIGHTLY ... but I have very few miles and can see where this would have become worse over time ! Good catch

 

Hi,
Good call Geo cause my hose also is slightly worn. However it is not worn enough that I'm concerning myself to get a new hose. I think the problem could be solved if the hose had a little more slack.
Tom

100th POST!!!!!! YAY!

 

what is the hose rubbing against??

anyone have a pic of a line with some wear on it??

 

If you just look at the line pointed out in the picture at the point where the circle is ... you can see that silver valve there... You will probably find that the line is very tight against it... that is where you will see the wear ...

 

I just checked mine, and my hose completely routed differently than the one in the pic, and apparently by a lot of people on here! Mine was routed nicely, except for the area where it's squeezed between the injector cover and thr blower. But so far, so good.

 

So where do I get my boots fixed?

 

Yep I checked mine and it's routed completely differently as well. I think that's why I was confused before I looked at the picture, I couldn't figure out where the hose would be rubbing. Thanks for the head's up, though, Geo. And thanks to whoever posted the pic!

 

Can anyone take a pic of there hose that is not routed this way ? The one in the pic is moved slightly... When I first checked it... it was pinched pretty tightly in that circled area.. I just moved it up a little bit but it is still rubbing there... I played with it for just a minute and couldnt find a really good place for ... Or atleast it didnt seem to be a good place for it

 

I just bought a digital camera. I'll post pics tomorrow.

 

Sweet thanks...
BTW did you get my PM phxSS ?

 

thanks for the heads up i just checked and my hose almost has a hole in it thanks again

 

I took pics, but son't know how to upload them to this post.

 

Thanks for the heads up...i'll check mine too.

 

PHXSS, E-Mail them to me and I'll host them for ya. -Erik-

 

Ok. I's at work now, so gotta wait till midnight.

 

Just whent to my local chevy dealer and they said that they will replace my vacum line so that was cool. Also if we could get a picture of what it looks like with the line in a bad loacation and what it should look like routed right then this might help anybody fix this issue.

Thank you all for the Thanks for the heads up and pics.

 

That's what I'm trying to do. I'll have pis posted by mosrning.

 

Nice find Geo.
Did your hose have an actual hole in it when you found the problem, or was it just starting to wear? Also, what was your max boost before finding this problem and fixing it?