Thanks for all of the answers! So now, the point of my question (and this is really the end), was that I was curious if this fuel shutoff still works once the o2 sensor has cooled down. I'd be driving down a really long hill with the van in gear, and at the top, I'd be happy about the fact that I was consuming zero fuel, and then, once I had gone far enough the o2 sensor was cool and reading flat, I was wondering whether I was still consuming no fuel, or whether I was now consuming fuel after all. If the engine braking fuel shutoff still works after the o2 sensor cools, it means it's still most fuel efficient to stay in gear. I guess if it doesn't, you should be better idling on the way down, or shutting off the engine.
On Sat, Aug 30, 2008 at 2:50 AM, Dennis Haynes <d23haynes57@hotmail.com>wrote: > No, fuel cut off only occurs when the engine is warmed up enough for > closed loop operation. > > Dennis > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > pickle vanagon > Sent: Saturday, August 30, 2008 1:19 AM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: When the O2 sensor cools down... > > On Fri, Aug 29, 2008 at 10:25 PM, Dennis Haynes > <d23haynes57@hotmail.com>wrote: > > > Engine braking is strictly a function of the closed throttle causing > high > > manifold vacuum as the engine is being driven by the wheels. Yes, engine > > braking is caused by vacuum, not compression. > > > > What I meant to ask, is whether the ECU still shuts off fuel to the > injectors above the cutoff (I thought it was 2000rpms?) at zero throttle > even if it is not yet in closed loop mode. It makes sense that it would, > I > just can't verify this with the mixture meter since the o2 sensor is > nonfunctional at this point. > |
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