Fuel Consumption on Idle and on key starts

[bughaw787]

Does anyone know how to compute fuel consumption when the engine is on idle given the Engine displacement and RPM.

Tried searching the net and the most i can get is:
Typical Engine Idle Fuel Consumption:

500-700RPM >>>> Half a Gallon/Hour (1.8918 liters/Hour)
900-1200RPM >>>> 0.75 GPH (2.8377 LPH)

----------------------------------

FC on a 2-second keystart is about 0.0024/Gallon (0.0091/liter)

[niky]

You'll need an O2 sensor to back-calculate... some cars run slightly rich or slightly lean at idle... so you can't always tell from displacement and rpms.

The only really accurate way is to actually test it with a flow-meter attached to your fuel line.

[feeter]

Just want to share this...
Our Starex idled last night, with aircon for at least 5 hours. The fuel marker before is just slightly lower than the halfway marking, then when I checked after the 5-hour idling, the marker drops to near the baseline. Horrible isn't it? But when I drove it again, the marker rises up again to one- fourth marker and the expected FC for the entire trip was achieved accordingly.

[v6dreamer]

Just want to share this...
Our Starex idled last night, with aircon for at least 5 hours. The fuel marker before is just slightly lower than the halfway marking, then when I checked after the 5-hour idling, the marker drops to near the baseline. Horrible isn't it? But when I drove it again, the marker rises up again to one- fourth marker and the expected FC for the entire trip was achieved accordingly.

Why would you do that? 5 hours of idling w/ a/c on! Of course its horrible not to mention how many liter of gas you've burn for nothing, I understand if this is a long driving, but sitting that car idling for so many hours... I dont get it.

[mazingerZ]

Why would you do that? 5 hours of idling w/ a/c on! Of course its horrible not to mention how many liter of gas you've burn for nothing, I understand if this is a long driving, but sitting that car idling for so many hours... I dont get it.

Baka brownout at nanood na lang sila ng DVD sa starex sir v6.

[v6dreamer]

Baka brownout at nanood na lang sila ng DVD sa starex sir v6.

Oo nga noh! Bakit hindi ko pala naisip yon.

[rion]

Just want to share this...
Our Starex idled last night, with aircon for at least 5 hours. The fuel marker before is just slightly lower than the halfway marking, then when I checked after the 5-hour idling, the marker drops to near the baseline. Horrible isn't it? But when I drove it again, the marker rises up again to one- fourth marker and the expected FC for the entire trip was achieved accordingly.

Fuel marks are like that, when you turn off your engine. and turn on again, the pointer will point differently.

even flow meters cannot really make accurate readings. based from myth busters. may airflow na halo kasi eh. (saving fuel myths episode) (aircon vs no aircon with open windows) their best result was really running both vehicles in a race track on full tank and when will it starve.

imo, if you want accurate result, route your fuel outside like to a coke or something. hehe...

btw, I recall in discovery channel about a huge army tank that consumes a galon just to start it up.

[kinyo]

Some new cars have digital display of fuel consumption, in km/li, which can be used to determine consumption at idle, in conjunction with the speedometer.

[mackkcam]

huhuh ang mahal na nag gas, ang 500 ko dating 10.++ liters, ngaun 9.++ liters na lng!!! waaaaaaahh that is good for 3-4 days na sana, mukhang 3 days na lng!!

[bughaw787]

You'll need an O2 sensor to back-calculate... some cars run slightly rich or slightly lean at idle... so you can't always tell from displacement and rpms.

The only really accurate way is to actually test it with a flow-meter attached to your fuel line.

*niky

Was just thinking (especially if you have a new ride), the car would basically be running on a standard mix on idle. Doesnt have to be exact - an estimate would be fine so that we can have a general idea on FC.

[niky]

Sounds like your idle jet is leaking something fierce... either that, or your choke is stuck open. Can't tell unless we see it firsthand.

Either way, it's a fair bet it's time for a carb overhaul.

[janmike]

Sounds like your idle jet is leaking something fierce... either that, or your choke is stuck open. Can't tell unless we see it firsthand.

Either way, it's a fair bet it's time for a carb overhaul.

yep must be the idle jet (and secondary jets maybe?? or float bowl not closing??)..the choke butterfly on the other hand is fixed wide open (one click start hot or cold engine, no problem at all!?). to my understanding you needed this partially closed on cold start-ups and fully open in normal operation tama ba?? or is this the culprit?

[jjmd3_787]

The AAP brochure states that you consume 300cc+ of fuel at idle. Hindi nga lang nilinaw kung anong displacement at fuel system ang basis nila.

The point is . . . it doesn't matter how much or how less you consume gas at idle, you still get a 0 KPL.