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S80 2.5T - starts then dies; MAF?

posted by  Dan in VT on  Mon May 17 15:48 CST 2021
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2005 S80 2.5T, ~160k miles.

The car starts, then quickly dies. Repeatedly. No CEL.

I unplugged the MAF, it started and ran smoothly for several minutes. Turned off the car, plugged the MAF back in. Now it starts and runs smoothly. Two questions:

1) Bad MAF?
2) Why does it run nicely with it unplugged? That surprised me.


Thanks!

Dan







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    S80 2.5T - starts then dies; MAF?

    posted by  james_a_sousa on  Tue May 18 12:31 CST 2021
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    last visit: Thu Oct 23 18:51 CST 2014
    [RELATED]

    Take a good look inside both parts of the connector - sometimes the pins get pushed back inside the connector, giving a bad connection.

    As for running with it disconnected, if the signal from it is really bad or missing, the car's computer may switch to a limp home mode.

    Did you take it for a test drive with it unplugged ?

    You may find that it did not run as well as you think.

    If a pin is pushed back, carefully slide it out the back of the connector and you will see a tang that sticks out to hold it in place - carefully bend it out a bit and put it back in the connector.

    In some cars, that connector is unplugged to change the air filter and is prone to damage.








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    S80 2.5T - starts then dies; MAF?

    posted by  KlausC on  Mon May 17 20:19 CST 2021
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    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    Clean the connector plug and use dielectric grease.

    MAF is not needed at idle speed, only when throttle is applied.

    Without a CEL error, it may be possible that you jiggled something else that was loose.


    --
    Keeping it running is better than buying new







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