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Old 01-15-2008, 08:09 PM   #1
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Is warming up really necessary????

Hello all,

Just trying to a point here.

Is warming up really necessary?

I thought it is only necessary with caborated cars and not for fuel injected.

For years I used to warm up. But for the last seven years, I just drive away slowly and the engine warms gradually.

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Old 01-15-2008, 08:20 PM   #2
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Nope it is not nessasary or even recomended by any major manufacturer......g

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Old 01-15-2008, 08:21 PM   #3
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The Jeep will use pre-written parameters in the computer when the vehicle is warming up. In other words, instead of reading all the different sensors, and adjusting the air fuel ration etc. accordingly, it just uses values that are written in the computer, untill the engine warms up enough for O2 sensors to become active. Also, there are metal parts inside your engine that need to expand when they get hot, to work properly (increased blowby in the rings etc.).

With that said, as long as you let it sit for a few seconds to gain oil pressure, and take it real easy, its not TOO horrible for the vehicle, just not that great either.

Also, your needs to go through drive cycles to test certain engine sensors, and make sure everything is working properly. Warm-up is one of those drive cycles. If you are starting your Jeep, driving it, and shutting it down before it warms up, the Jeep wont have a chance to run a check on some systems.
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Old 01-15-2008, 08:37 PM   #4
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The only real way to warm an engine with zero damage is to preheat. The reason being that pistons and blocks are made from different metals that expand at different rates. This can cause the aluminum pistons to expand rapidly against a slowly expanding block and cause scoring. To avoid this, preheat with an engine block heater or the heaters we use in aircraft.

The thing is that you wont see as much damage in this liquid cooled car as you will in my business working with 350ci 4 cylinder air cooled engines that run molasses for oil.
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Old 01-15-2008, 08:42 PM   #5
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I give mine 10 min every morning, the reason? I don't like being cold.
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Old 01-15-2008, 08:49 PM   #6
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i give it about a minute, get in turn it on, hook up my ipod to the charger and the stereo, put my back pack next to me, put my hat on, find a song put the parking breka off, og through all my homework in my head ot make sure i ahve ti all and then head off, by that time i figure it has warmed up enough and im not driving it while it is still like 0 degrees, and i also go slowly down the driveway

im not sure it really needs it though
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Old 01-15-2008, 09:02 PM   #7
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Quote:
Originally Posted by JCS05Rubi View Post
The Jeep will use pre-written parameters in the computer when the vehicle is warming up. In other words, instead of reading all the different sensors, and adjusting the air fuel ration etc. accordingly, it just uses values that are written in the computer, untill the engine warms up enough for O2 sensors to become active. Also, there are metal parts inside your engine that need to expand when they get hot, to work properly (increased blowby in the rings etc.).

With that said, as long as you let it sit for a few seconds to gain oil pressure, and take it real easy, its not TOO horrible for the vehicle, just not that great either.

Also, your needs to go through drive cycles to test certain engine sensors, and make sure everything is working properly. Warm-up is one of those drive cycles. If you are starting your Jeep, driving it, and shutting it down before it warms up, the Jeep wont have a chance to run a check on some systems.
Yep thats why the computer raises the idle when cold to warm up the engien faster.
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Old 01-15-2008, 10:27 PM   #8
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Holy SHITAKE MUSHROOMS!!!

Wow; great points. I thought it was a lot simpler than that. Great points all!!!!
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Old 01-15-2008, 11:09 PM   #9
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Originally Posted by JCS05Rubi View Post
The Jeep will use pre-written parameters in the computer when the vehicle is warming up. In other words, instead of reading all the different sensors, and adjusting the air fuel ration etc. accordingly, it just uses values that are written in the computer, untill the engine warms up enough for O2 sensors to become active. Also, there are metal parts inside your engine that need to expand when they get hot, to work properly (increased blowby in the rings etc.).

With that said, as long as you let it sit for a few seconds to gain oil pressure, and take it real easy, its not TOO horrible for the vehicle, just not that great either.

Also, your needs to go through drive cycles to test certain engine sensors, and make sure everything is working properly. Warm-up is one of those drive cycles. If you are starting your Jeep, driving it, and shutting it down before it warms up, the Jeep wont have a chance to run a check on some systems.

The only "test" it will run is an Evap test and the parameters nessasary to run this test are often... not acheived in the average drive a vehicle makes whether it warms up or not...if the test doesnt run it doesnt run no big deal.....the PCM is constantly monitoring all the other sensor values when your driving......cold or hot if a TPS sensor is Reading 5 volts it sets a code.it matters not weather its cold or hot.....the O2 sensors are the only sensors which require any "heating time and even that is relativly short these days....no warm up is nessasary at all these days.....g
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Old 01-15-2008, 11:32 PM   #10
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i give it about a minute, get in turn it on, hook up my ipod to the charger and the stereo, put my back pack next to me, put my hat on, find a song put the parking breka off, og through all my homework in my head ot make sure i ahve ti all and then head off, by that time i figure it has warmed up enough and im not driving it while it is still like 0 degrees, and i also go slowly down the driveway

im not sure it really needs it though
then realize that you need to take more spelling courses...
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Old 01-15-2008, 11:40 PM   #11
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350ci 4 cylinder air cooled engines .
put me on the list for one of those will ya?
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Old 01-16-2008, 12:06 AM   #12
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put me on the list for one of those will ya?
X2
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Old 01-16-2008, 06:43 AM   #13
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The only "test" it will run is an Evap test and the parameters nessasary to run this test are often... not acheived in the average drive a vehicle makes whether it warms up or not...if the test doesnt run it doesnt run no big deal.....the PCM is constantly monitoring all the other sensor values when your driving......cold or hot if a TPS sensor is Reading 5 volts it sets a code.it matters not weather its cold or hot.....the O2 sensors are the only sensors which require any "heating time and even that is relativly short these days....no warm up is nessasary at all these days.....g
I agree with you Gary, I was just pointing out that the computer does run system tests during warm up. We are unsure of his driving habits, and he wanted to know what the deal with warm up is.

True, the 02 is the only sensor that needs a warm up period, but the computer cannot adjust A/F ratio until exhaust temp and sensor temp is high enough. Thus, the computer cannot properly use the IAT, MAF, etc. to gain the proper fuel ratio.

As everyone said, its not too horrible to drive on the engine before its 100% warmed up, just understand that there are engine parts that need to expand, and systems that are not active, before the engine achieves normal operating temp. In other words, don't be drag racing the Jeep when its cold, and realize your MPG will suffer when its not warmed up (although idling for 15 minutes aint good for that either ).
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Old 01-16-2008, 10:26 PM   #14
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put me on the list for one of those will ya?
they run about $25,000 a pop
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Old 01-17-2008, 12:13 PM   #15
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they run about $25,000 a pop
now where did I put SCOUT's credit card number...

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