[beeper]

Hello all...new to board,have been reading a lot ,this is first post. My new ride is a 2005 SE with a 6...have to say this is one sweet ride, I have about 1000 mi in a month and all is great. I have noticed that on cold startup the engine runs at 1500 rpm and as it warms up that idle drops down to about 600 rpm. Seems to me the 1500 is too high for a cold engine but this is first Toyota. Any comments ?

[Mark86]

All 4Runners do that when they are warming up. The engine is very loud when you first start it cold. It is all perfectly normal! As long as you barely hear your engine when idling at normal temperature, you are fine!!

[ms044runner]

I have wondered that myself since its been cold the last few months. I thought something was wrong with my engine.

[EDGE]

it runs at a higher rpm to warm it up, all vehicles do that it's nothing new

[mikes4runner]

Yes right down the road from you beeper, all is normal no worries.

[MicaBlue03]

You'll probably notice that the engine seems louder for the first 15 seconds or so after startup, whether in hot or cold temps. The temperature-sensitive fan clutch apparently has a fluid in some passages that normally gets spun out to its perimiter after a few seconds, allowing the fan itself to spin more slowly than its drive hub. So the engine/fan combo is extra loud at first when the engine is cold.

I've always been a little surprised at how high these engines rev right off the bat when cold. I don't think it's the best thing for their longevity, but I suspect it helps warm them up quicker and reduce emissions. I suppose that some would argue that warming them up quicker (even if the revs are pretty high at first) is better in the long run. This is just another of those things that the engine computers do differently than I would, and that I just choose not to worry about.

[EDGE]

It works like a choke on a mawnlower or snowblower, it won't start without the highidle, I tried it on a car, left it overnight and when we started it up it would just stall, it needs more gas to run.

Funny how you think it's high and will hurt the longevity of the engine, have you noticed that it only revs at 1500rpm and the manurfacture specifies when you start up the vehicle and you are letting it warm up to drrive no higher then 2000rpms

[beeper]

Thanks for all the posts...lots of info there, I didn't think anything was seriously wrong but maybe a cold adjustment was needed. It runs fine warm . Nice quet engine with plenty of punch.

[Ridger]

I love this forum and the "search" feature.

I was wondering about the high rev's on cold start as well. My previous trucks all rev'd higher on cold start, but none as much as my 4Runner.

Good to hear that this is normal though.... again, thank you T4R.ORG!!!

[Ridger]

I'm still wondering a little bit about this high idle thing....

... when I start my 4Runner it revs very high for about 15 sec with the tach at about 1300-1400 rpm, then after that 15 sec it quiets down some (as explained above due to the engine/fan combo) but still continues to rev high and still within the same rpm's (1300-1400) and I've let it sit for 3-4 minutes and it still is revving at the same rpm's.

Then when I put it in drive it wants to lurch forward hard and when I start driving the transmission doesn't even want to shift from 1st to 2nd. I push the gas pedal and it revs higher but doesn't seem to engage the transmission right away (feels like it's slipping). After a few minutes of driving everything seems normal again and I never feel any transmission issues any other time.

Is this what everyone else is feeling?

Of course the weather is colder here now with winter coming on, but I park in my garage and it never gets below freezing in there.

I meantioned it to my dealership and he mentioned it might be due to some idle sensor or chip (not sure what he called it exactly now) that might need reset?

[Nuke]

1500RPM high idle at startup is not abnormal.

Also, both my previous 3rd gen and my current 4th gen tend to stay in a lower gear (rev higher) for the first mile or so in colder weather. This is also normal, allowing the tranny to warm up faster.

[Ridger]

Okay... good to know, guess everything is normal then, thanks Nuke!

I also did a test at noon time, so I'll share anyway... the temperature was 8 C (46 F);

Start - 1500 rpm
15 sec - 1300 rpm
30 sec - 1300 rpm
45 sec - 1300 rpm
1 min - 1300 rpm
1.5 min - 1200 rpm
2 min - 1100 rpm
2.5 min - 1000 rpm
3 min - 1000 rpm
3.5 min - 900 rpm
4 min - 900 rpm
4.5 min - 900 rpm
5 min - 900 rpm

After a 5 min drive - 700 rpm (which is normal)

[eskimochaos]

Its normal - its entirely controlled by a computer.

Mine is over 1.5k on cold mornings.

Idle is exactly 625 w/0 AC compressor engaged btw - not 700. They lowered it in the 05 model year. I dont remember what it was originally.

Applicable to V8 ONLY

/thread

inb4 you need to warm your engine before driving

[Nuke]

Originally Posted by eskimochaos

...inb4 you need to warm your engine before driving

Not so.

With todays oils plus the fact we're using 5W in lieu of the older 10W oils, you only need enough time to ensure you have oil flow, which is practically immediate. The time it takes to fasten your seatbelt and check your gauges after cranking the engine over, you should be ready to go. Just go easy on the acceleration those first few miles and you're fine.

[eskimochaos]

Originally Posted by Nuke

Not so.

With todays oils plus the fact we're using 5W in lieu of the older 10W oils, you only need enough time to ensure you have oil flow, which is practically immediate. The time it takes to fasten your seatbelt and check your gauges after cranking the engine over, you should be ready to go. Just go easy on the acceleration those first few miles and you're fine.

Which is why I said I was in b4 someone said that it was necessary - you misinterpreted or I wasnt clear.