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Like most females' typical mental image of the "male", I snuck outside to install my Dawe's MBC while my wife was nursing our new born. He's doing great by the way. Did I feel guilty? Yeah, but when I told her the outcome I was the hero of the hour.
Anyway, for those of you who've been following this, or are in the same boat, I've been struggling with perpetual fuel cut off for some months with my 94 Aero. Attempts to cure this have been a new BPC, new ECU, new vacuum hose, and new NGK plugs to no avail other than draining my bank account. The present plan was to swap out the actuator arm for a new one as this looked to be the guilty culprit. Then I installed an MBC, figuring what the heck, I'll just be careful with the throttle, and that's when things got interesting.
My method of installation may be a bit different from some. With about 4" of silicone hose on either end of the MBC I installed it in between the actuator and the turbo. I affixed the MBC to the cold air hose from the BPC, and nestled it down by the cold air pipe. I then capped off the BPC wastegate and turbo valves.
In stock form I slowly edged the car towards full throttle but the boost held rock solid at about 60%. With the Saab BPC in the line I always hit the fuel cut off as the boost triggered the MAP. Returning home I slowly increased the boost amount by shortening the MBC until it held just into the red. No matter what I do I can't get the boost to over shoot, or hit the fuel cut off. I suppose if I kept shortening it I could trigger the cutoff, but I'm going to play it on the conservative side.
Now then, my best guess is that perhaps the extremely short lines between the MBC and the turbo are getting the actuator arm to function as it should, or perhaps my BPC had some electrical problem that couldn't be diagnosed. Or maybe my ride had some voodoo curse on it. Any thoughts?
I realize that MBC's have disadvantages and potential risks, but used responsibly I'd encourage others out there who are in the same boat as me to give it a try. That said, if you're greedy, and wick up the boost too high relative to your fuel supply & octane you could find yourself with a melted engine, or if you let loose in first, you'll be buying a new tranny before long. In my case, I believe I've found a cheap and elegant solution to many months annoyance.
Thanks to all those (jj, aeroguy, billj, ldh, ari, dean) who have helped me trouble shoot through this.
Regards,
Bill
posted by 216.209.1...
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