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Any shop that has an oscilloscope can determine TB swing spikes at the TPS
Step one remove TB clean, replace any gaskets, reinstall and road test
The big issue on the 4.8 is the throttle positioning sensor (TPS) is built into the throttle body and everything is drive by wire. As more and more crud builds up on the Throttle body plate, the more likely it is to stick in the idle position. Carb Cleaner, that is O2 sensor safe, and a tooth brush will clean off the crud. Check your intake for oil that is coming out of the vapor separator tubes. Those are the two fat hoses left and right of the TB. Also replace your Engine Crankcase Vent Valve BMW PN: 11127547058 QTY: 2.
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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
Last edited by StephenVA; 09-15-2022 at 10:43 PM.
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