Gee, I thought the only thing the Temp I sender did was send a signal to the gauge. Well, I'll be dipped in Orange Coolant! DM&FS ----- Original Message ----- From: "Mark Keller" <kelphoto@islandnet.com> To: <vanagon@GERRY.VANAGON.COM> Sent: Friday, May 11, 2001 10:39 AM Subject: Re: Gas Mileage and Fuel Pressure Regulator
> Listmembers, > > I wrotee about the Temp I sensor below in two previous post. After > re-reading my original post I would like to clarify that the Temp I > sensor only indicates an "extra rich mixture by say 20% on extremely > cold mornings, say when the temperature is <32 F or 0 C. The TEMP II > sensor Cold start enrichment is for general conditions. I had > originally wrote to this effect and mistakenly deleted it during an > edit. Sorry for any confusion. > > > To add to the discussion regarding Temp I function on the Digifant > system during my original post: > > > The information I received from Darrel Boehler was that that extra fuel > enrichment is added by the ECU when the TEMP I sensor indicates near > freezing air. The ECU's map may then wait until either an indication > from TEMP II, i.e. engine beginning to warm, or just wait until close > loop before the TEMP I enrichment value is canceled out. > > Either way, Darrel "guestimated" the value to be 20% extra to the > regular cold start mixture map. It seems Darrel stated that this is the > only purpose for the TEMP I sensor. > > > My original post excerpted below is: > > "The first clue that the fuel pressure regulator is setting too high a > pressure is cold mornings when temp I, an air temp sensor, determines if > the computer richness the mixture to start the engine. A pressure > regulator that is beginning to get too high will cause the engine to > sound like it's running on three cylinders, or chug, and then as it > warms up and the Temp I compensation is removed, the chugging smoothes > out. I've had this, and was related too high a fuel pressure." > > Sincerely, > > Mark Keller > 91 Carat > Cowichan Bay, BC |
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