Automatic Trans Question

When i first crank up my taco and it is still in park, the engine revs pretty high. It hovers a little over 1500 rpms for as long as it's in park, but as soon as i shift to reverse or drive the rpms drop down to normal range. Does anyone elses truck do this? Is this normal?

 

happens to me all the time i think its just because the motor still cold

 

Yeah, at first i thought it was because the motor is cold, but it happens quite often.

 

I really haven't paided much attention to it.. I think sometimes we just look for things to be wrong, where there really isn't anything wrong to begin with... we just worry about our tacos to much... and should be enjoying the hell out of them! Now if they fail to start one morning... then we should worry about something being wrong... ! ! !

 

^ very true any time some ones with me and i start my truck and it does that they always ask about but i just tell them that my trucks a beast and it does not like sitting around lol

 

Here in central Florida mine does it all the time and it is not cold in the morning. Furthermore, the RPM's do not drop until I put it into drive which is unusual. With every vehicle I have owned, when starting cold, the RPM's will go up to around 1200 or so but will begin to fall after about 10 seconds or so. Tomorrow I am going to wait to see how long it will take before the RPMs in my Taco starts to drop.

 

My taco revs in the same range as described on initial start up and I also live in a warm climate. I believe this is normal, however. The temp difference in warm and cold climates are what, a 40 degree spread? It's not that much when you consider the jump to the operating temp.

In the morning, I will let the engine run until the rpms drop to under 1000 on their own. Then I am comfortable that everything is well lubed and there are no significant temp variations throughout the engine that may cause an undesireable affect to internal components over time.

My trailblazer also has higher initial start rpms than the operating rpms. I let the rpms drop to under 1000 before rolling after a long shut down on it as well.

So, while I can't really give an accurate confirmation, I believe the truck's computer tells it to do that until reaching the operating temperature

 

Thanks for the responses everyone. After hearing what everyone has to say it looks like this is normal behavior for my tacoma, so i don't have to worry about it anymore. Thanks again.

 

Just another reply here...

We were all talking about this before in another thread several months back. Mine has since stopped revving so high (after ~6000 miles). Now it only does it when it is cold. I hope this is encouraging, but the bad news - I have a 2.7L. The 4.0L might be different.