If you can only start the engine when your foot is on the accelerator, you probably have a MAP sensor problem. Hard Starting. Similarly, an excessively rich or lean mix makes the engine hard to start.Insufficient fuel injection starves the engine for fuel, leading to rough idling and perhaps even random cylinder misfiring. Excessive fuel generates higher hydrocarbon (HC) and carbon monoxide (CO) emissions, while insufficient fuel may lead to higher nitrogen oxide (NO x) emissions. Failed Emissions Inspection. Because fuel injection doesn’t correspond to engine load, a broken MAP sensor can lead to an increase in harmful emissions.However, if too little fuel is consumed, the engine may lack power for acceleration and passing. On the one hand, fuel consumption will go down, which seems like a good thing. Lack of Power. If the ECM is reading high vacuum, it assumes the engine load is low, so it cuts fuel injection and retards spark timing.This leads to excessive fuel consumption, poor fuel economy, and possibly detonation. Poor Fuel Economy. If the ECM is reading low or no vacuum, it assumes the engine is at high load, so it dumps in more fuel and advances spark timing.So, how will you know that your MAP sensor is going bad? Here are the key problems to look out for:
If the MAP sensor goes bad, the ECM can’t accurately calculate engine load, which means the air-fuel ratio will become either too rich (more fuel) or too lean (less fuel). Sometimes, engine heat “overcooks” the MAP sensor's electronics or cracks vacuum lines.
MAP sensors fail by getting clogged, contaminated, or damaged. MAP sensor problems could trigger a DTC and check engine light.
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