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Old 03-25-2014, 04:52 AM   #14 (permalink)
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Join Date: Feb 2009
Location: Estonia
Posts: 199

Green frog - '97 Audi A4 Avant 1.9TDI 81kW
90 day: 43.1 mpg (US)
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I accellerate and engine RPMs are up (lets say 2500rpm) and then you put car to neutral, it seems logical that you get fuel cut - car ecu sees that you want RPMs to go down to idle speed - so to drop rpms, it cuts fuel. Why it should send fuel to injectors if RPMs must go down? It decellerates engine using fuel cut. When engine speed goes to idle speed, injectors are turned on again - otherwise it would stop.

I have verified this with two cars watching mpguino (Mitsubishi Eclipse and Audi A4 diesel).
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