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How Long should i idle my car from the first start of the day?

I idled my car for 3mins this morning and my friend said i was wasting fuel

He recommended i could drive immediately the oil pressure light goes off(thats like 4secs from start)

Is that True?

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14 answers

Read this and decide what's best for you. Personally I warm up engine for few minutes before driving off.

The reason that engineers recommended the "drive away" warm-up, as opposed to allowing the engine to warm up at idle was that the faster the warm-up, the lower the build up of harmful condensation within the engine and exhaust systems. So, if you are only going to drive a short distance, you (your car's engine, actually) are better off just driving away after a very brief (30 seconds or so) warm-up, thereby allowing the engine to warm up quickly, and minimize the amount of harmful or corrosive condensation build-up, before shutting down. The majority of the engine wear occurs immediately upon start-up, no matter whether you drive right away or sit and warm it up.

Your engine will incur less frictional wear if you let it warm up at idle (at as low an rpm as it will run at) than if you just drive away. However, if you slowly warm it up at idle and then drive only a short distance before shutting down, the condensation formed in the crankcase (which didn't get a chance to evaporate/boil-off during the short drive) will then work it's mischief. This is the main reason that more frequent oil changes are recommended, by manufacturers, during cold weather months; to get rid of that condensation.

So, if you want to "drive right away", not only should you keep the revs down (but avoid lugging, at all cost), but you should keep the engine load / throttle opening very light. If you drive a cold engine, right away, under high load / high throttle settings, your engine will wear very rapidly indeed.

A "static" warm up is good, provided you are going to drive the car long enough for the condensation to evaporate / boil-off, before reaching your destination. Personally, on puma, I use a combination of the two. I let it warm up, at idle, for a few minutes at as close to 1000rpm as I can manage (usually it's between 1200-1500), then drive away very gently for the first several miles, until the oil temp gauge clears the left green "spot". Of course, I live in a rural area, where I can do this without getting in everyone's way. Those of you in built-up areas, with lots of traffic, probably won't have the luxury of allowing the engine to come up to operating temperature, before you might need to use a heavy application of power. In other words, no one's situation will be exactly alike, so, we all need to do what suits our car's needs vs. traffic and weather conditions to keep engine wear to a minimum.

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@icemaan

i have not changed by engine mounts

almost did that a week ago

when i observed the engine block jerks foward when i put it in drive

the mec says it may be connected to the raised idle rpm

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@sultaan

changed my engine oil a month ago

what should be the ideal rpm for a nissan maxima?

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My car manual says not to idle the car. Drive off immediately.

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@babatosan

Try your service your injector first. Have u changed your Engine mounts/seats recently? u may have the wrong mounts

also check out  http://www.nairaland.com/nigeria/topic-161742.0.html

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@ivvie @siena

please help

my 2000 nissan maxima, stops when i am at a traffic stop

a mechanic had to raise the idling speed to just above 1,000 rpms

it stopped the switching off, but the engine is now noisy and consumes more fuel

also the change in gears on the auto transmission aint smooth

my battery is fine, as someone recommended i change it

what should i do

please advise

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so u are saying the idling is for the ATF and the removal of the Nitrous oxide in the combustion chamber?

Can agree with the idea of idiling 4 the ATF cause i get irregular Gear changes in the morning

@ivvie

Can u explain derivation of Von Mises Stress Equation for me?

and the whole idea of it

i have an idea of tensile stress and Yeild behavior of metals, so u can start from there

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Instruction manual in most modern cars states:

Upon start-up, the car does not need to be left to idle, and should be driven straight away.

Just common sense with RPM - oil takes a lot longer to heat up than water does.

I've delved into, and built many engines over the years, for various applications, and have not seen any significant wear in even a 200,000 mile motor, due to a lack of idling before drive-off, when cold.

And believe me, most of my clients drive their cars like they stole 'em - i.e, hard!

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Friend of mine says his car has someting like a Governor that prevents him from exceeding 100KMPH when his Engine is not Hot Enough

Is that true?

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what of valve adjust ments and cam lubrication? how long will that take?

the same 30 secs?

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About 30m secs, just enough to get the whole system properly lubricated.

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Dont have cat. in my car. i removed it cause  i heard it slows the car down

is that true?

I think i need 2 get i since the world is saying "GO GREEN"

so no catalyst, no long idling

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Idling your ride is not only wasting gas, but poluting the air for me and urself.

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Yes, your friend's correct.

Modern cars are meant to be fired up, and driven straight away.

Idling period only applies to old cars.

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