Idle's one thing -- that's the responsibility of the idle speed controller dingus, pretty much. But when the engine is being spun by outside forces (say, downhill in gear), then foot off gas = zero fuel. It's in the Bentley's somewhere. Manual's not at hand but I did look at that and post it here late 2007, early 2008. TI think that there is at least one throttle body switch + rpm condition not well explained in the Bentley's manual. List members hand-waved that off by saying that the ECU sees the Hall sensor and does some ju-ju with the data. But we don't like black boxes. -- Mike "Rocket J Squirrel" Elliott 84 Westfalia: Mellow Yellow ("The Electrical Banana") 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano Bend, OR KG6RCR On 8/17/2009 1:52 PM pdooley wrote: > Hmmm, I may have an answer for my own question. > The hall sender could detect RPM below or approaching idle speed and add > fuel. > > > -----Original Message----- > From: pdooley [mailto:psdooley@verizon.net] > Sent: Monday, August 17, 2009 4:45 PM > To: 'Rocket J Squirrel'; 'vanagon@GERRY.VANAGON.COM' > Subject: RE: Not quite a backfire . . . > > How does this work? > How does the ECU know to shut fuel completely off when descending but yet > could add fuel in a split second to prevent stalling if say, you press the > clutch pedal in? > The idle switch cannot discern the difference between idling and coasting in > gear. > I really don't see how the AFM could perform this function either. > Somebody enlighten me. > > > <With no pressure on the gas pedal, the fuel is totally shut off, so the > engine is not firing on any cylinders..... > > |
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