What I would like to know is:

if the system has a leak somewhere, wouldn't there be no boost produced at all? Meaning, the boost produced would leak out of the weakened/open spot, and the gauge would stay at or below base boost.

If I am able to see the gauge get into the red (full), then quickly drop back out to mid-yellow (base), or in some rare (but enjoyable) instances have the boost stay in the red like it's supposed to, this would lead me to believe it is not a leak but an ECU-to-BPC condition. The question is, what is the ECU finding/picking up on that is causing it to send a signal to the BPC to open the wastegate?

I have no issues with misfire or hesitation and my NGK plugs are fairly new (1K miles on them) and gapped correctly and I use di-electric grease (assume DI is okay then).

I have disconnected the BPC and the turbo boosted well into the red (assume the turbo is okay then).

I have tried a donor BPC and the results were the same (assume my BPC is okay then).

Have not found any vacuum-hose leaks, and my BPV is working correctly.

IF I had restricted fuel flow (due to a faulty new filter), wouldn't this restriction be present across the full throttle range? The car runs smooth and fine during normal cruising, and when it tries to reach full-boost (assume the fuel flow/filter is okay(?)).

This all leads me to believe the 2nd new O2 sensor might also be faulty. I'm sure this has happened before to other people, where they have installed faulty new products 2 or 3 times in a row.

Can the O2 sensor circuit system be diagnosed (in the event it is my system circuit)? Not just the sensor itself, but the whole circuit (from sensor to ECU)? I may have to take the car back to my indie for some research, if so.

Joe

posted by 12.111.48...

• Another observation w/continuing low-boost saga..., Joe98, Wed, 12 Nov 2003 08:45:29
  • Something else..., Joe98, Fri, 14 Nov 2003 07:05:03 <-- Viewing This Message
    • Another idea on Oxygen sensor, Bill Homer , Fri, 14 Nov 2003 09:23:24
      • Re: Another idea on Oxygen sensor, Joe98, Fri, 14 Nov 2003 09:44:39
  • Dumb question but..., David Ingram, Thu, 13 Nov 2003 13:26:29
    • Not a dumb question at all, David..., Joe98, Thu, 13 Nov 2003 14:12:20
      • Maybe it still is a dumb(er) question..., David Ingram, Fri, 14 Nov 2003 05:46:14
        • Here's your clarification:..., Joe98, Fri, 14 Nov 2003 06:31:07
  • Don't know who has been following my many posts..., Joe98, Thu, 13 Nov 2003 07:58:06
  • Two points on similar issue with my 98, John Adams, Wed, 12 Nov 2003 20:41:46
  • Re: Another observation w/continuing low-boost saga..., mike9k, Wed, 12 Nov 2003 12:53:55
  • have you checked for air leaks..., Chuck, Wed, 12 Nov 2003 12:42:41
    • Good Idea! We have just about run out of other..., TonyJ , Wed, 12 Nov 2003 20:32:22
  • Re: Another observation w/continuing low-boost saga..., Kappy, Wed, 12 Nov 2003 08:51:28
    • O2 sensor is a "new" new one..., Joe98, Wed, 12 Nov 2003 09:11:11
      • Re: O2 sensor is a "new" new one..., Kappy, Wed, 12 Nov 2003 09:21:03
        • More..., Joe98, Wed, 12 Nov 2003 09:42:11
          • Manifold Absolute Pressure (MAP) sensor ..., Bill Homer , Wed, 12 Nov 2003 09:58:36
            • Re: Manifold Absolute Pressure (MAP) sensor ..., Dan Y, Fri, 14 Nov 2003 06:10:55
          • That's not an AMM it is a ...., jj, Wed, 12 Nov 2003 09:52:57

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