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Author Topic: Warming up the car Back to Topics
JamCoope

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Maryland

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Message Posted: Jan 26, 2011 10:21:52 AM

Most people agree that cars run more economically once they're warmed up... especially in the cold winter months.

Here's a question: has anyone tested whether it is more economical to let your car warm up by idling in the driveway, or by just letting warm up as you drive?
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LarryMarg
Champion Author New York

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Message Posted: Sep 30, 2014 9:31:18 AM

From Fuel, tires, brakes, oil: Four car myths debunked:

Your engine doesn't need to warm up anymore

When the mercury falls, motorists are conditioned to allow their vehicles’ engines to run for a few minutes before setting out on the road. But unless you're just trying to heat the cabin, modern engines are typically ready to go once awakened.

"In older cars, carburetted engines absolutely need a warm-up because they are designed with a constant air-fuel ratio,” Quora user Garrick Saito, wrote. “If the engine was not warm enough, older engines would tend to stall." But fuel injectors and the engine control unit (ECU) have made things much simpler for drivers.

In the 1980s, car manufacturers moved away from carburettors to fuel-injection systems, and more recently have adopted direct-injection solutions that spray gasoline precisely into cylinders, right where it is needed. When paired with the ECU, most engines so equipped run fine straight away, no warming required. Saito added that with their sophisticated ECUs, newer cars "are able to change the settings to the required ratio, based on ambient air temperature."

And don't fuss over warming up the oil, either. Though oil flows better when warmed, it reaches optimum temperature sooner when the car is in motion – just don't drag race right out of the gates.
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dontuknowOH
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Message Posted: Sep 30, 2014 6:40:13 AM

My econos: Usually 10 seconds on a fresh start-up, then drive away moderate at temps of 50+ F degrees an above.

About 30 sec. is average, when Winter is the norm and if temps are below 20 F, I allow the engine to warm a one minute minimum up to three minutes, before moving away. That's close to 150* engine coolant that's still building on up to normal operation(thermostat settings).

If safety, wear/tear is the true concern even the amount fuel use, this WFM. The garage adds a benefit, block heaters, patio/car-port, semi-heated garage, a ducted home heat supply line insulated pipe to ones outside cowl vent to the cabin area can be DIY'ed if a (forced air type home furnace).

Similar to some crawl spaces being partial heated by an extra smaller forced air furnace duct outlet applications only used during colder Winters.
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hoopitup2000
Champion Author Virginia

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Message Posted: Sep 30, 2014 6:28:25 AM

Warm up time is usually 5-10 seconds
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rcsteve23
Champion Author Ohio

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Message Posted: Sep 29, 2014 3:43:58 PM

no
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redfish67
Champion Author Dallas

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Message Posted: Sep 28, 2014 11:06:28 AM

no
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contiki
Champion Author Ontario

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Message Posted: Sep 28, 2014 8:09:27 AM

Only in the winter months for our family...........
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pilotdlh
All-Star Author Minnesota

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Message Posted: Sep 27, 2014 11:39:00 AM

Only in the winter
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Y2KSierra
Sophomore Author Calgary

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Message Posted: Sep 27, 2014 11:25:01 AM

Good idea to idle for a short time an allow the oil to circulate. Just remember that every gallon of gas burned while parked equals to zero miles per gallon for your calculation.
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b899
Champion Author Connecticut

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Message Posted: Sep 27, 2014 8:55:48 AM

no
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b899
Champion Author Connecticut

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Message Posted: Sep 25, 2014 8:40:36 AM

no
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PriceTOPPLER
Rookie Author Buffalo

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Message Posted: Sep 23, 2014 2:58:55 PM

You should warm up for a least 3 min in warm weather and 5-7 in cold weather... you Douches!!!
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dontuknowOH
Champion Author Ohio

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Message Posted: Sep 23, 2014 10:47:27 AM

Still 30 sec. Tire check first Ok and away........
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hoopitup2000
Champion Author Virginia

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Message Posted: Sep 23, 2014 6:22:25 AM

Only if necessary, which is mostly never.
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twt
Champion Author Virginia Beach

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Message Posted: Sep 23, 2014 6:06:29 AM

When your engine is running, you're burning gas. Do the math.
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krellu74
Rookie Author New York

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Message Posted: Sep 22, 2014 3:56:31 PM

NEVER
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WEDDY
Champion Author Phoenix

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Message Posted: Sep 21, 2014 9:23:01 AM

No
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PaylessKY
Champion Author Kentucky

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Message Posted: Sep 21, 2014 8:31:10 AM

No. During the winter I start the car and drive, unless the windows need to be cleared.
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Safari7350
Sophomore Author Illinois

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Message Posted: Sep 21, 2014 2:36:06 AM

No.
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MsPeachi747
Veteran Author Cleveland

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Message Posted: Sep 20, 2014 7:23:28 PM

Necessary during winter months, not late summer months. Not yet.
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b899
Champion Author Connecticut

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Message Posted: Sep 20, 2014 8:44:11 AM

no
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contiki
Champion Author Ontario

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Message Posted: Sep 20, 2014 8:11:55 AM

This time of the year not required........................
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b899
Champion Author Connecticut

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Message Posted: Sep 19, 2014 7:38:37 AM

no
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jay93LA
Champion Author New Orleans

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Message Posted: Sep 17, 2014 8:01:05 AM

no
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contiki
Champion Author Ontario

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Message Posted: Sep 17, 2014 7:26:03 AM

Not needed...only in the winter months...........
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hoopitup2000
Champion Author Virginia

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Message Posted: Sep 17, 2014 6:35:35 AM

Not really!!
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MertieMan
Champion Author Lexington

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Message Posted: Sep 17, 2014 5:11:41 AM

Old thread, ban it. No need to warm up the car, it will warm up driving it sensibly.
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Shockjock1961
Champion Author Illinois

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Message Posted: Sep 16, 2014 10:37:38 AM

".there is NO mechanical reason for you car to run for several minutes to "wamr up",, even in Canadian winters of -20"

No, but there are safety reasons...
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dontuknowOH
Champion Author Ohio

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Message Posted: Sep 16, 2014 9:52:43 AM

30 seconds for now, longer if my old bones need it, I paid for a cabin heater, hope it still works, Hot chocolate to the rescue, maybe I can penny pinch on the fuel thing.....! Replaced that cabin filter and removed the debris mess thereabouts, Shade trees abound where I park a lot, the daily ride.

For a 2 minute warm-up my econo uses normally less than $.10 for each cold overnight start-up as fuel costs on an average Winter morning near 20* F. That registers near 165* of engine heat that builds up to normal on a drive-away within a few more seconds. When fuel jumps to near $3.60 a gal the warming still stays under #.15, no complaints, for a total 3 minutes, before driving.
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b899
Champion Author Connecticut

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Message Posted: Sep 16, 2014 9:08:25 AM

No
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chipperd1
Sophomore Author Peoria

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Message Posted: Sep 14, 2014 8:29:40 PM

30 seconds and I start moving
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dontuknowOH
Champion Author Ohio

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Message Posted: Sep 13, 2014 10:37:19 AM

les4hdtv; I'm still scratching my head after reading your post's >> >> General Note; Referring to "an engine running on it's own" second possibly an Alabama's closed garage average garage temperature? And a 2013 modern vehicles choke system?...... Where have you been?.....

No pun intended, I get the part of idling for one minute engine warming in order to back out of a large/small garage, carefully! I'm still wondering if your MPG trip reads fuel consumption when going in reverse, idling or not for one minute or not, I get the uphill test for working your engine load, still what is then the wind direction during the test?

If you must be having trouble with the fast idle circuit on a IGN. key start-up, possible that vehicle needs a check-up (just a hint) before another Alabama Winter Season follows soon after August.... Fall.....G-L!
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mybigtruck
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Message Posted: Sep 13, 2014 7:56:08 AM

I don't warm up. I warm up by driving slowly down the street
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twt
Champion Author Virginia Beach

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Message Posted: Sep 13, 2014 3:19:56 AM

A waste of gas. Any time an engine is running, it's using gasoline.
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GrumpyCat
Champion Author Alabama

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Message Posted: Sep 12, 2014 9:41:50 PM

> contiki...there is NO mechanical reason for you car to run for several minutes
> to "wamr up",, even in Canadian winters of -20

Agreed. Its a waste of fuel. However if one's electricity is not exceptionally expensive it is usually cheaper to preheat the engine with a block heater than the extra fuel consumed while your engine is both warming up and propelling your vehicle.
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gougedQC
Champion Author Montreal

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Message Posted: Sep 12, 2014 9:05:50 PM

contiki...there is NO mechanical reason for you car to run for several minutes to "wamr up",, even in Canadian winters of -20
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FieroGT
Champion Author Twin Cities

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Message Posted: Sep 11, 2014 5:00:49 PM

My car is ready to go the moment I turn the key.
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Awing1
All-Star Author Ontario

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Message Posted: Sep 10, 2014 8:03:04 AM

yes
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contiki
Champion Author Ontario

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Message Posted: Sep 10, 2014 8:00:47 AM

Warm up vehicles only in the winter months.......
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redfish67
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Message Posted: Sep 9, 2014 10:19:58 AM

doesn't need to warm up, you're just wasting gas
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BigHorne1
Champion Author Missouri

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Message Posted: Sep 9, 2014 9:08:47 AM

newer vehicles, you will be punished on your mgp for warming up your vehicle.
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twt
Champion Author Virginia Beach

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Message Posted: Sep 9, 2014 8:30:05 AM

If the engine is running, it's using gas. DUH
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TheRealDeal78
Champion Author Bakersfield

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Message Posted: Sep 9, 2014 2:01:29 AM

I just get in a go. Warm up as I drive. Over 140K miles on my current vehicle and no issues ever.
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Awing1
All-Star Author Ontario

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Message Posted: Sep 6, 2014 10:46:54 PM

yes
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jwb1013
Sophomore Author Detroit

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Message Posted: Sep 6, 2014 11:14:29 AM

usually no
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dontuknowOH
Champion Author Ohio

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Message Posted: Sep 5, 2014 10:16:55 AM

Probably in a few months ahead, Weather often decides that. I still try to avoid lengthy idling when possible for any reason. My driving consists of using economy vehicles 85% of the time, so 18-24 MPG. vehicles get a rest.
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contiki
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Message Posted: Sep 5, 2014 7:48:39 AM

Not needed now................
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contiki
Champion Author Ontario

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Message Posted: Sep 4, 2014 7:25:09 AM

In the summertime not required...only in the winter months do we warm up the vehicles...........
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gmarn
Rookie Author Kansas City

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Message Posted: Sep 3, 2014 12:37:16 AM

Yes I have
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Houckster
Champion Author Atlanta

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Message Posted: Sep 2, 2014 5:30:50 PM

JAMCOOPE writes: Most people agree that cars run more economically once they're warmed up... especially in the cold winter months.
______
Whether most people agree or not, it's a fact engines run more economically when they're warmed up. This is inherent with ICE engines because to warm up, they must use a richer fuel mixture.
_____
JAMCOOPE writes: . . . has anyone tested whether it is more economical to let your car warm up by idling in the driveway, or by just letting warm up as you drive?

There has been some argument here with some contending that letting the car warm up before driving uses an inconsequential amount of fuel while others say that it is best to drive off after a few seconds and drive easily until the engine has reached normal operating temperature.

I'm with the latter group. From the US Department of Energy we have this: Don't idle your car to warm it up. Most manufacturers recommend driving off gently after about 30 seconds. The engine will warm up faster being driven.

Getting the Best Fuel Economy in Winter

[Edited by: Houckster at 9/2/2014 5:31:21 PM EST]
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BigHorne1
Champion Author Missouri

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Message Posted: Sep 2, 2014 10:05:16 AM

not anymore, with the new technology, it just worsens your mpg.
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