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Contour lines are an effective device for representing relief on topographic maps. They can be defined as an imaginary line connecting points of equal elevation on the ground surface. … Every fifth or tenth contour starting at sea level is an index contour, which is drawn as a heavier lineRead More →

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Signs of a Broken MAP Sensor 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. … Lack of Power. … Failed Emissions Inspection. … Rough Idle. … Hard Starting.Read More →