Last month we asked this Tech question and invited you to share your answer. We value your expertise and want to thank everyone who participated!

What does it mean when a vehicle is referred to as using a speed density system?

Answer: It means the car uses a MAP sensor to calculate the air entering the engine.
A MAP sensor is used to calculate the air pressure behind the throttle plate. Combining this information with the intake air temperature sensor and engine rpm the engine control computer calculates the air density as well as the amount of air entering the engine. The system is called speed density because it relies on the speed of the engine and the density of the air to calculate how much fuel to add to the engine.

Congratulations to the following shop who answered this question and will be receiving a prize pack!
TECH CHALLENGE PROMOTION REMINDER
The Tech Challenge question is published in our weekly eNewsletter with an online answer form. Fill out the form with the details of how you would perform the repair to be entered for the chance to win the prize pack. You can also submit a challenge for future Tech Challenges! A draw is conducted with all shops who answered the question correctly and one is selected as a winner for a prize pack.
 
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