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Saturn Ion MAP Sensor helps the engine provide crisp throttle response by providing precise data of the manifold pressure to the ECU. The Saturn Ion received praise for its peppy 2.2L Ecotec engine which combined 145 horsepower with respectable fuel economy, while the supercharged Red Line variant offered 205 horsepower to the young drivers who wanted the power to drive fast but without the wallet-killing operation. Saturn engineers installed five-speed manuals and smooth four-speed automatics, giving the owner the choice of driving style. Quiet Steel panels and under-hood acoustic barriers lent the cabin a calming air during highway runs, and the polymer body panels shrugged off parking lot dings so the car remained sharp. Long-term reliability, low-cost OEM parts, and easy DIY maintenance helped the Saturn achieve loyalty, and the Ion still rewards a lot of attention to maintenance. The MAP Sensor in every Ion is a small pressure transducer which measures the real-time intake vacuum, converts it to a voltage signal, and allows the computer to balance the fuel flow and ignition timing for steady idle, strong acceleration, and clean emissions. Because the MAP Sensor is part of the speed density strategy, having a healthy MAP Sensor unit is important before pursuing other performance problems. For installation, disconnect battery, unplug harness, remove screws, change sensor, clean port, evenly secure, reconnect wiring and battery, check steady idle.