Thread: Engine Braking
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Old 10-02-2012, 11:22 PM   #13 (permalink)
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spyder2 - '00 Toyota MR2 Spyder
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Originally Posted by Miller88 View Post
Most manual transmission vehicles i've driven with DBW throttles will not slow themselves down ... they just keep going.

the only way I can get my Focus to slow down without using the brakes, is to set the cruise control and hit the decelerate button on it - that shuts the throttle and lets the car slow down.

My focus cuts the injectors as DFCO, but does not shut the throttle
Is this right? I always thought that wasn't the case... I don't think NOx increases when you shut the throttle plate because nothing is being burned so there's no high temperature for NOx to form. However, leaving the throttle open under deceleration means that you're pumping cold air through the cats which cools them down, and that could be bad.
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