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Originally Posted by MNBoxster
Hi,
A failed MAF isn't going to damage the car/engine, just prevent it from running especially well.
The DME may already be in Open Loop depending upon what, if anything, the MAF is telling it. The signal may just be degraded (bad, but still functional), emulating the worst possible operating parameter, that is, at the extreme, but still functional. So the DME (possibly further confused by non-corroberating signals from other sensors like the O²s), selects the wrong MAP and the car runs like ********************. The DME doesn't know that the MAF has failed, conditions could be such that this is actually what the MAF is experiencing or sensing, that it's not lying if you will.
By pulling the connnector, the DME now knows that the MAF is offline and goes right into an Open Loop default MAP...
Happy Motoring!... Jim'99
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Great explanation!!! I just find it funny that these computers know the signal coming from a sensor is bad, flashes the cel telling you not to drive the car, allows the car to run like ********************, yet isn't "smart" enough to bypass the failed sensor to allow a safe condition for driving. Manual intervention is needed.
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