[alfa] Re: hot restart and throttle comment

[Michael Tiefenback <tiefenback@xxxxxxxxxxx>]

> Date: Wed, 16 Jun 2004 21:18:54 -0600
> From: C M Smith <cmsmith@domain.elided>
> Subject: [alfa] Hot restarts on V6 engines
>
> Supposedly, opening the throttle on a FI engine has no effect while cranking.

just before gleefully supplying a couple of interesting counter-examples.

I'd suggest a _possible_ mechanism.  FI engines monitor air flow and coolant temp and maybe another thing or two to set mixture for running/starting.  A fully hot engine makes the ECU lean out the engine.  If the false air leaked around the AFM by the idle CO screw dilutes the mix more with only starting RPM
(say, because a sticky AFM door doesn't want to open) then opening the throttle would pull more air through the AFM, opening the door or simply diluting the effect of the idle CO false air.  Maybe.  Pushing a bit of carb/brake cleaner into the intake of the balky warm engine might show whether it's rich or lean.
Or not.  Such a test might indicate what to tweak for improving the warm start behavior if it is a nuisance (say, to a spouse; I've learned that my spouse isn't as handy with or tolerant of funky mechanicals as I usually am).

Michael
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