takkar

Just had a discussion with a friend on something and I need your help in proving a point..
My point is that the fuel required to initially start a car when cold is the same as idling the car for 2 mins...is this true. I know that frquent start stops are not good for the workings of the car, but what about gas comsumption. The new electric hybrids shut off on stop lights...so are they better off that way.

importuner

fuel pressure remains the same through the start-up process and idling. when starting the car it does not consume the same amount of fuel as if you were idling for approximately 2mins. the amount of fuel that's used in 2 mins is extremely to much. the car would choke on gas before starting.

Bensmax00

when the car is started the fuel pressure is slightly higher for just like not even a second--then it drops to like 35psi if you hook a fuel gauge you will see this and when you turn the vehicle off the fuel pressure shouldnt bleed off that fast-if it does bad fuel pressure regulator or leaky injectors

01GreyLustreSE

iTrader: (7)

The new electric hybrids shut off on stop lights...so are they better off that way. the hybrids have isa( integrated starter alternators) they dont have a normal starter like we do. instead they have a lot of magnets around the flywheel and when you press the gas the ecu sends voltage to the magnets which turn the flywheel instantly thus starting the gas engine instantly... plus on a cold start your in open loop. ecu isnt looking at 02 its just dumping fuel for the high idle. theres a lot of factors that go into your question like ambient air ( outside temp) but for a short answer on a cold day you may waste more gas at intial start up just because the car takes longer to warm up...