Harry,

It's possible that there's more than one thing wrong with the system, but I think you need to take care of #3 before you go any farther. Unplugging the APC valve should make the boost *lower* not higher!

There's a good page that shows how the solenoid valve controls boost at http://www.users.qwest.net/~qed/volvoapc/apcsolenoid.html. Looking at this, I'm guessing you have the "c" and "r" hoses swapped. "C" should go to a fitting on the side of the turbo compresor housing. "R" should to to a fitting in the large duct that feeds the turbo intake.

One more thing that may be helpful, the APC does not get its "brake pedal" signal from the cruise control system. There are 2 separate pedal switches: one for the cruise, the other for the brake lights. APC reads the brake-light signal.

Hope this helps!

Eric Law

posted by 206.96.16...

• Boost problems.....(long), Harry, Fri, 17 May 2002 05:04:06
  • Darned "enter" key!, BillJ, Fri, 17 May 2002 17:20:02
    • Re: Darned "enter" key!, Harry, Fri, 17 May 2002 22:19:15
  • Re: Boost problems.....(long), BillJ, Fri, 17 May 2002 17:18:52
  • Another Update...., Harry, Fri, 17 May 2002 11:19:07
    • The Mystery Deepens!, BillR, Fri, 17 May 2002 15:53:57
    • You might want to look at the connector......, zeke, Fri, 17 May 2002 14:54:22
  • Re: Boost problems, Bob Davis, Fri, 17 May 2002 09:52:16
  • First things first..., Eric Law, Fri, 17 May 2002 08:15:52 <-- Viewing This Message
    • Aha! - so base boost and non-working cruise are .., BillJ, Fri, 17 May 2002 08:38:35
  • Update, Harry, Fri, 17 May 2002 08:02:23
    • I think you have a vacuum leak..., Bob Davis, Fri, 17 May 2002 10:00:19
    • Sounds like a leak, but..., BillJ, Fri, 17 May 2002 08:14:35
  • Is it possible..., BillJ, Fri, 17 May 2002 06:57:13
    • Re: Is it possible..., Harry, Fri, 17 May 2002 07:46:35
      • My theory on the hoses..., BillJ, Fri, 17 May 2002 08:28:42
      • Balance Shafts !!??, BillR, Fri, 17 May 2002 07:50:50
        • I think that is absolutely correct., Robert Kaplan, Fri, 17 May 2002 12:40:48
  • How the APC solenoid affects boost, BillJ, Fri, 17 May 2002 06:35:43

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