Well, it runs much better, or differently, with the MAF disconnected, what now ?
A – It is almost certain that the MAF is faulty. If MAF failure is not total, but due to the output being out of calibration, cat equipped cars will often run very rich, or not run at all, until the MAF is disconnected. Then they will run in limp home mode. Non-cat cars typically run with an increasingly weakening mixture over time, in limp home mode they will tend to run rich at small throttle openings. Note that if the car has not automatically reverted to “limp home” mode, the engine may have run with an excessively rich mixture, and may not start and run with the limp home programme until the spark plugs have been removed and allowed to dry out. Alternatively, the car can be left for several hours to “dry out”, or you can try starting the car with the throttle to the floor. With the Limp Home programme, the car will run very rich at idle, especially once the engine reaches normal temperature. But if it runs at all, whereas it will not run at all, or much worse with the MAF connecte
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