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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