Listmembers, I originally Posted "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." David Beierl wrote: > > Oops, missed that one. Yes, you're right -- T I + AFM = air mass. The > cold compensation is from T II. > > david > > At 01:57 PM 5/10/2001, Mark Ingalls wrote: > >Really, Thanks Mark for a good post to hash out. > > > > > >But I was under the impression that the temp 1 was a constant imput to the > >ECU. It tells the density while the AFM tells the volume. Together they > >would be mass air flow. > > >Mark Ingalls
To add to the discussion regarding Temp I function on the Digifant system:
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. Sincerely, Mark Keller 91 Carat Cowichan Bay, BC |
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