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The air pump will not effect the MAF as it is not connected to the intake side. It flows into the exhaust side of the engine. As posted it will be effected by failed parts bolted to the 3.0 that provide air to it or down stream. Bench/car test with a separate 12V source (battery or converter) and confirm operations. Disconnect all the hoses going to it before testing as this will provide a baseline of operations, then connect everything back up.
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2005 X5 4.8IS
The Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
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