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Very little boost and a P2172 code. - Page 2
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Thread: Very little boost and a P2172 code.

  1. #11
    Senior Member atikovi's Avatar
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    Quote Originally Posted by nyc eng View Post
    Probably a vacuum leak.

    Possible causes per manual:
    VACUUM LEAK
    RESTRICTION IN THE EXHAUST SYSTEM
    INTERNAL ENGINE MECHANICAL COMPONENTS
    RESISTANCE IN THE 5-VOLT SUPPLY CIRCUIT
    RESISTANCE IN THE MAP SIGNAL CIRCUIT
    RESISTANCE IN MAP SENSOR GROUND CIRCUIT
    MAP SENSOR
    POWERTRAIN CONTROL MODULE (PCM)
    Smoke tested it for nearly 10 minutes and found no leaks.
    Have good 5V and ground at the MAP sensor.
    Vacuum tested MAP sensor with hand pump.

    inches Hg, volts, MB

    0 1.61 998

    10 1.11 661

    15 .87 500

    20 .61 334

    psi boost, volts, MB

    5 2.00 1294

    10 2.59 1642

  2. #12
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    Quote Originally Posted by atikovi View Post
    Smoke tested it for nearly 10 minutes and found no leaks.
    Have good 5V and ground at the MAP sensor.
    Vacuum tested MAP sensor with hand pump.
    Did you hookup a vacuum gauge to the intake manifold to compare the gauge reading to the MAP sensor reading in your software?

    I sent you the wiring info to check resistance. They recommend checking resistance between 3 spots.
    [12] Abarth | [04] Z06 | [06] CBR600RR

  3. #13
    Senior Member atikovi's Avatar
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    21 in Hg at idle on gauge is about 320 mbar in live data.

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    Senior Member atikovi's Avatar
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    I replaced the throttle body and drove it a few times today for over 20 miles. Runs great so far.

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  6. #15
    Senior Member atikovi's Avatar
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    Well that didn't last. Doing the same thing as before with the same code. Throttle light flashing and running real rough. Happens only while the engine is idling like at a stop light or coasting. Shut it off and restart and it's normal again. Must have happened half a dozen times yesterday. Smoke tested again and see no leaks. Hate throwing parts at it but at least they are fairly cheap so have a MAF sensor on order.

  7. #16
    Senior Member atikovi's Avatar
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    Quote Originally Posted by nyc eng View Post
    Possible causes per manual:
    RESISTANCE IN MAP SENSOR GROUND CIRCUIT
    MAP sensor replaced but still the same problem. I checked for ground at the MAP sensor connector and found something I dont understand. With the ignition on, its 14 ohms and with it off, under 1 ohm. Im no expert at diagnostics but that doesnt seem right.

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