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The DME should pull timing based on intake air temp. If the DME is reading a constant value, it will not be able to compensate properly. So adding a IAT will take care of this. This is the good part! The bad part is that the DME will also lean out the mixture when it's hot. However with True Air Mass (MAF), this should not be done. So when you add a IAT sensor to the APE MAF, ignition will be reduced (no problem), but at the same time the AFR will be leaner (problem). The MAF compensates for changes in temps, having the DME compensate and adjust fuel is not needed with a MAF.
There are various types of Intake Air Temp (IAT) sensors. The correct one must be used! You can pull the IAT out of the stock AFM, but you will destroy the AFM. We use a aftermarket IAT similar to the factory unit with some of the MAF sensors that we use.
During warm weather, assuming the pinging is caused by advanced timing (and not incorrect AFR), it's best to use the Fuel Quality Switch (FQS) to retard the timing. Usually Position 4,5,6 and 7 will do this. FQS is a 8 position rotary switch on the side of the DME. This might fix the pinging.
The correct fix it to use the proper software with the IAT & MAF.
I'm not here often. Feel free to emal me directly if you need help.
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