Archon I was reading in another post that you responded to and you had mentioned that your friends car done this also and when you did the boost bypass thing it went away.

You also stated that you had to figure out if it was the solenoid or actuator..could you please explain to me where is this actuator located at is it the rod coming out of the solenoid??I do know where the boost control is located at and I am familar witht the boost bypass trick also.

Did you ever figure it out for your friend?

http://www.bonnevilleclub.com/forum/...r=asc&start=20

I was reading this post and where is the evap purge valve at? I think I am going to look further into the evap system.Why not could be as simple as that.So the canaster itself is under the car right under the passenger floor?I am just so frikin frustrated with this I just gotta figure it out its killen me inside!!!!!!

Frankly, I've come pretty close to running out of ideas. I doubt the boost control solenoid is the problem. That would be more likely to prevent you from getting into boost. The actuator is that black cylinder that has the vacuum fittings on it.

Unfortunately, doing the boost bypass was not the solution to the problem. Some time after I posted that, I found that the reason that the car was no longer doing it was because it was not going into boost. Rather than leaving the bottom hose unconnected, I had plugged it which kept the actuator from being able to allow it to go into boost. The "real" solution was what did not work for you. Cleaning the grounding strap connection from the battery. I cleaned it up, scraped off some paint, put on a star washer that would bite into the body better, and gooped it all up with dielectric grease. That was maybe 8 months or so ago, and the problem has not returned.

As it only happens as it enters boost, doesn't necessarily point to a boost control related problem. Lots of things can affect it as it goes from sucking the air in, to having it blown in.

To be sure - did you clean up the positive sides also? The battery, the connection to the rear and under hood fuses boxes, as well as being certain that the bolts holding the boxes down are good and snug?

That would be very likely to throw a code, but to answer your question, the purge valve sits above the rear valve cover near the MAP sensor. It'* that small black cylinder with the vacuum hoses on each end. The canister is under the car, roughly by the back seat. A gray or black rectangular box. The vent solenoid is by the rear wheel.

BCS and BCA won't cause 'chugging'. Only low or no boost. Rule those out.

Well I did as you suggested and cleaned all connections up from the battery.

After doing that I thought I would re-check all vacume line and lines going to the evap system,upon looking at the hose that comes from the map sensor and goes to the front of the throttle body there is a fitting a rubber one that connects the plastic hose to the outlet on the throttle body it seemed to be loose as if I could squeez the fitting going around the outlet at the T/B while it was connected and there seemed to be alot of excess so I went and got one that was close and made sure it was snug and since I have done this it seems to be almost gone completely but......there is still a slight chug almost unnoticeable when in o/d.

So I guess it is vacume related and will have to check every fitting cause all the plastic hoses are fine.It seems like the rubber ones look ok but removing the one I just replaced seemed a liottle dry rotted.I will let you know what I find.

Great. Sounds as if you're slowly getting there. Triple check the cap on the multi-port fitting on the supercharger. Unless it'* already been replaced, it'* almost certainly leaking. Sometimes the cracks won't be visible unless the end is moved around some.