MPFI & Fuel intake

venkatrx · 5th May 2006, 16:38

HI Guys,

w.r.t MPFI engines pls tell me....(assuming the AC is switched off)

1. is the fuel intake constant during idling?
2. is the fuel intake only controlled by the accelerator pedal?
3. if vehicle is in 5th gear @ 50 kmph, i slow it down to 30 kmph, now if i press the pedal completely the rpm increases very slowly, does it mean that a lot of fuel is supplied but not used in the engine?

drifter · 5th May 2006, 16:43

1. Fuel intake is constant during idling under normal running.

2. No, the ecu also can independantly change the rpm according to the load conditions such as AC being switched on or during start up when the rpm is temporarily raised to warm up the engine.

3. Yes, the ecu enriches the air-fuel mixture as per the load conditions. You cant call it wasted fuel...but its best to shift down a cog.

Drifter

5th May 2006, 16:38	#1
venkatrx BHPian Join Date: Jan 2006 Location: bangalore Posts: 453 Thanked: 4 Times	MPFI & Fuel intake HI Guys, w.r.t MPFI engines pls tell me....(assuming the AC is switched off) 1. is the fuel intake constant during idling? 2. is the fuel intake only controlled by the accelerator pedal? 3. if vehicle is in 5th gear @ 50 kmph, i slow it down to 30 kmph, now if i press the pedal completely the rpm increases very slowly, does it mean that a lot of fuel is supplied but not used in the engine?
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5th May 2006, 16:43	#2
drifter Senior - BHPian Join Date: Sep 2004 Location: Bombay Posts: 1,488 Thanked: 75 Times View My Garage	1. Fuel intake is constant during idling under normal running. 2. No, the ecu also can independantly change the rpm according to the load conditions such as AC being switched on or during start up when the rpm is temporarily raised to warm up the engine. 3. Yes, the ecu enriches the air-fuel mixture as per the load conditions. You cant call it wasted fuel...but its best to shift down a cog. Drifter Last edited by drifter : 5th May 2006 at 16:44.
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