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Dead MAF?

This is a discussion on Dead MAF? within the General Help forums, part of the LSx Technical Help Section category; How I can tell if my MAF sensor is messed up? My car is running pretty rich, I am getting ...

  1. #1
    Rice Killa JwMonE99's Avatar
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    Dead MAF?

    How I can tell if my MAF sensor is messed up?
    My car is running pretty rich, I am getting bad gas milage and when I start the car it takes me a while to get it started.
    Starter, battery, and plugs are fine.

  2. #2
    down with the lot lizards blackhawk01's Avatar
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    check O2 sensors

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    Life in the Fast lane sunsetorangess's Avatar
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    Any codes? Whats your fuel pressure at?
    J
    2001 SS, Its not the car its the Driver that matters....

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    Veteran 0rion's Avatar
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    does it do it on cold starts? If so you can rule out O2's because the car is in open loop and not using the O2's for fueling. Does the car miss at all?

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    Ricekiller z28punk's Avatar
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    unplug the sensor and see if it runs better. thats how I tell if it is bad

    the PCM defaults to speed density formula which is a fail-safe for the maf sensor

  6. #6
    Member myk02k's Avatar
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    Quote Originally Posted by JwMonE99 View Post
    How I can tell if my MAF sensor is messed up?
    My car is running pretty rich, I am getting bad gas milage and when I start the car it takes me a while to get it started.
    Starter, battery, and plugs are fine.
    If your MAF is messed up you'd be throwing codes. Your car will automatically sense that due to conflicting o2 and maf read-outs. It's possible you could have lost a solenoid, so your best bet is to just take it off the car and take a look at it. Clean it as well with electric cleaner because it'll make it more accurate since it collects dust after a while (assuming it still works). Mods? Any other symptoms?

    You could also reset the PCM by disconnecting the battery for about an hour. That will let the vehicle re-learn fuel tables and all that fun stuff...

    Quote Originally Posted by z28punk View Post
    unplug the sensor and see if it runs better. thats how I tell if it is bad

    the PCM defaults to speed density formula which is a fail-safe for the maf sensor

    Don't think the car will turn over at all if the sensor's disconnected. A speed density program requires a MAP sensor which I don't think the LS1's have, so how would it do so?

  7. #7
    Veteran 0rion's Avatar
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    LS1's have a map sensor....it's on the back of the intake. I ran my car speed density all last year. The OP has an LT1 though.

  8. #8
    Ricekiller z28punk's Avatar
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    LS1's have a map sensor....it's on the back of the intake. I ran my car speed density all last year. The OP has an LT1 though.
    woops forgot!!! thanks

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