Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Why is my idle higher while coasting than when I'm stopped?

endurance · 10-06-2010, 10:55 PM

I just noticed today that when I'm coasting with the engine on my tach is showing 1100-1200 RPM, but when I come to a full stop the idle drops to 750-800 RPM. Is this normal? Could it be a gauge anomoly? Any way to get my coasting idle down to the stopped idle?

I'm planning on putting a fuel injector kill switch in anyway, but it's come up in another thread that I may want to keep the engine idling sometimes to retain engine heat during the winter. I'm not even sure how the car knows I'm coasting vs. stopped. Damn computers!

10-06-2010, 10:55 PM	#1 (permalink)
endurance Master EcoModder Join Date: Sep 2010 Location: Foothills near Denver Posts: 279 RSX2fast4mpg - '02 Acura RSX Type S 90 day: 38.22 mpg (US) bubbatrucker - '98 Chevrolet K1500 90 day: 18.1 mpg (US) Thanks: 15 Thanked 25 Times in 17 Posts	Why is my idle higher while coasting than when I'm stopped? I just noticed today that when I'm coasting with the engine on my tach is showing 1100-1200 RPM, but when I come to a full stop the idle drops to 750-800 RPM. Is this normal? Could it be a gauge anomoly? Any way to get my coasting idle down to the stopped idle? I'm planning on putting a fuel injector kill switch in anyway, but it's come up in another thread that I may want to keep the engine idling sometimes to retain engine heat during the winter. I'm not even sure how the car knows I'm coasting vs. stopped. Damn computers!