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So my sister’s car is trying to kill itself again. On deceleration, the engine sputters out, it actually died as she was pulling into her driveway this evening. So I went and had a look, no codes. I managed to duplicate it while stationary, as after you have it reved up, as the rpms come down, it’s almost like it’s not settling back down at idle speed and dropping lower.
I did a quick look around the internets and the best plausible explanation would be a dirty throttle body. Just wondering if there’s anything else worth trying to look at before it gets shipped out somewhere.
In case it’s relevant, this is the 2.4 ‘world engine’ that’s in several Kia, Hyundai, Mitsubishi and Dodge products.
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Might want to try cleaning or replacing the IAC (idle air control) valve. Fixed my Rio when it was doing the same thing.
Mine was seized partly open which let the engine idle deceptively well in park, but when the revs dropped suddenly it would stall out.
It has a drive-by-wire throttle body so it doesn’t have a separate system for idle control. The computer just adjusts the throttle plate.
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