LRS12644A- BAP SENSOR: The BAP or Barometric Air Pressure Sensor, is located on the firewall behind the intake manifold and provides barometric air pressure readings to the PCM to adjust air/fuel ratios. Our direct fit replacement is guaranteed to make your bad sensor good as new. LRS-9002B-FUEL TANK: Posts 34,248. Boost is a measurement of intake manifold pressure. There will be very little at idle. Cracked exhaust manifold and resulting leak will effect boost. The exhaust pressure, and flow, are what turns the hot side turbo wheel. As the hot side spins, it turns the other side, pumping air into the engine. Theintake air temperature sensor measures the temperature of the air entering a car's engine through the intake manifold and relays the information to the engine control unit. To operate as efficiently as possible, car engines rely on the ECU, a small computer, to monitor and adjust various components and processes as conditions change. For example, air is denser in colder conditions, so the TOPAZ13627551429 MAP Sensor Manifold Air Pressure Sensor Intake Pressure Sensor Compatible with BMW 1 Series M 135i 335i 535i 550i 650i 740i 750i X3 X5 X6 Z4 Alpina B7 B7L 3.2 out of 5 stars 17 2 offers from $15.89 AirCleaner Intake Hose: Air Cleaner Intake Hose Adapter: Air Filter: Air Intake / Charge Temperature Sensor: Fuel Filter: Fuel Injection Pressure Sensor: Fuel Injector: Fuel Pump & Housing Assembly: Fuel Pump Gasket / Seal: Fuel Tank Cap: Fuel Tank Cleaning Tool: Fuel Tank Pressure Sensor: Throttle Body: Throttle Body Gasket: Loading lnJBr.

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