Right on my friend. Your mechanics teacher is a smart person.
Cold enginines reved at even a moderate rate might end up with engine damage. Fact is even modern engines have to run at a fairley high tempurature. Not doing so creates this.:

1. More gas usage.

2. More heat.

3. Heat killes engines or anything that eates energy, and runs fast.

4. Hence less life of a vehicle.

5. Heat kills everything, cars have to protect against that. But cars cannot do it. Us fellow humans have to do so.!



Hey, it is the truth,
Rick

 

I've been taught in every fuel injected vehicle I've driven, start it up, let it do what it wants 'til the RPM gets below 1000, and then drive. Be gentle 'til the temp hits at least 160 though.

I'm also very careful about the IAC, since when IACs go bad in our Ranger they tend to cause a skyrocketing of the RPM as soon as the engine is started, I haven't had a problem with mine but I keep my hand carefully on the key, just incase I need to throw it back to "off".

I also turn the key to run and let the fuel pump fully run before starting before every start, and once the engine's started run the tranny through all the gears before putting it in neutral to warm up (stick shift).

Just a couple more cents.

 

New helicopter tecnolegy will tell you, warm the engine up to operating temps before you fly. Being a certifited fixed wing pilot, the same thing as far as engine warm up is specified. Now I can tell you that aircraft engines are built to better specs than ground car engines. So if you have a better engine requiring better start up procedures, then why would lesser auto engines, built in lesser tolerances, not require at least a warm up before driving?

Go ahead and run your 30,000 dollar car with out a warm up. It is your money!

 

I knew it had to be bad for th engine somehow...I dont have an rpm gauge in my truck, just mph so i dont really know what its running at......I guess i should just start waiting it out every morning, since the winter is coming.