QUOTE (steveH @ Mar 4 2010, 12:37 PM) index.php?act=findpost&pid=301867

Does every one else have a real fast idle when the engine is cold when you first start it. It seems to really run fast for about 5 seconds and then gradually slows down. I think this started after they did a ECU upgrade to fix rough idle, has there been any more ECU upgrades?

There's a thread (an old one, though) around here on that subject somewhere. In a word, YES, we all see that, and some of us are less than impressed. I've never thought that 2300rpm on a cold start was gentle enough -- but there you have it. It is what it is. My 3.3L 2008 is the same way.

Drop it into gear immediately if you want to slow it down before it does this on its own.

 

I always drop my tanny into Neutral for 30 seconds when I cold start the engine and haven't noticed the fast idle. My truck and old Jetta would circulate the tranny fluid in neutral before actually meshing gears in drive so I'm hoping that's what I'm doing for my new-to-me Santa Fe.

 

My 04 does this and as far as I know, it's normal operating procedure.

 

QUOTE (steveH @ Mar 4 2010, 12:37 PM) index.php?act=findpost&pid=301867

Does every one else have a real fast idle when the engine is cold when you first start it. It seems to really run fast for about 5 seconds and then gradually slows down. I think this started after they did a ECU upgrade to fix rough idle, has there been any more ECU upgrades?

Yep, it does it for all of us. None of us like it but it is what it is. My new VW Passat CC 3.6 does not do this, just my Santa Fe 3.3

Do as canderson says and I do this also. Simply drop into gear asap and within a couple of seconds the RPM will drop considerably.

David <><

 

I checked my 09 Limited fast idle this morning. It was 30º F here this morning and my 3.3L went to 1500 RPM immediately on cold start up. That is about on par with the start up RPM I got on my 07 Sonata 3.3L. It does seem to take quite a while for the idle to come down when cold.

 

Mine goes to roughly 2000-2200 rpms' for about 10 seconds or so before settling down. Always has since new. Seems normal

 

My 2008 2.7L lights off at ~1500rpms and settles down quickly. That's not revving at all. I've started it anywhere from below zero F to around 80degF with the same results. The 3.3L might require a bit more because of design differences.

Joel

 

Mine revs like crazy for a few seconds too, then settles down. As bad as it sounds for the engine, however, it helps burn off the rich initial mixture which would otherwise contaminate your oil (and pollute the air). The sooner your engine and catalytic converter warm up, the better. And besides, if you're using the recommended 5w20 oil those cold revs aren't as harmful as they sound.

Your transmission is more likely to cost you money before your engine ever does, and slamming it into gear before the juices are flowing only makes things worse IMO. Don't worry about your engine. Just follow the service recommendations and it will probably out-last $8,000 worth of other parts.

 

I've noticed my Santa Fe has been idling high when starting it lately. I've never known it to idle as high as it has been before. I've driven it several times today, and the last time I started it, it revved to about 2000 RPM and stayed that way for a minute or two while I sat and talked on the phone. It doesn't always seem to back down after a few seconds like several of you have described, and putting it into gear doesn't seem to help either. Also, the engine just seems noisier than usual. Should I get it looked at?

 

QUOTE (carver2011 @ May 4 2010, 11:26 PM) index.php?act=findpost&pid=319698

I've noticed my Santa Fe has been idling high when starting it lately. I've never known it to idle as high as it has been before. I've driven it several times today, and the last time I started it, it revved to about 2000 RPM and stayed that way for a minute or two while I sat and talked on the phone. It doesn't always seem to back down after a few seconds like several of you have described, and putting it into gear doesn't seem to help either. Also, the engine just seems noisier than usual. Should I get it looked at?

Couldn't hurt. That it persists at 2K after it's been running for more than a few seconds isn't the sort of complaint any of us have had before. When you're driving it and pull up to a stop, does it continue to idle at a minimum 2K?

 

My 2004 2.7 Santa Fe also has had this fast idle issue at cold start up. I have observed over the last year that it only happens at a cold start when the A/C was on when the car was shut down the night/day before. I have started to shut the A/C off at least 0.5 miles before I get home so the ECM will have the setting recognized when I shut the car off for the night. When my wife drives the car and does not do this procedure it will undoubtly fast idle at cold start. The only thing that seems to stop the fast idle is when I hit the gas pedal momentarily while in park. I took it to the dealer last year and they were clueless and I was raped of $90 for the diagnostic fee. It must be something to do with the ECM setting and the A/C. The reason I say this because the problem went away during the winter months. When it cold hot the last month the problem is now back. The fast idle does not come down for at least a couple of minutes if I don't do anything. Anyone with more info please help. I believe Hyundai has a programming issue. I have not done the battery negative disconnect but I'll try it. Any help would be appreciated.

 

A fast initial idle (~ 1500 rpms) is completely normal for all cars with an automatic choke (which would be all fuel injected/computer controlled engines).
And yes, that means if your car isn't doing a fast idle on a cold start, there is something wrong with it.

It shouldn't last more than a minute or so (and may only last a few seconds), depending on the temp the engine was at when it was started and how quickly it's able to warm itself so that it no longer needs the choke. If it was very cold, it will fast idle longer than if it was hot, etc.

Again, perfectly normal.

That being said, anything much more over that rpm you should have checked, as you probably have a sensor or IAC servo going bad.

 

After a few weeks have gone by I believe it has something to do with the throttle body and IAC. I have routinely gotten in the car in the morning for a cold start and depressed the accelerator pedal a couple of times before starting the vehicle. Regardless of the AC switch selection, the car has not exhibited the high idle at cold start. Anyone else have inputs would be greatly appreciated.

 

Just fyi. Hitting the gas on a fuel injected engine does nothing until the engine is actually running.
Near as I can tell the pedal isn't even physically connected to the throttle on the santa fe.

 

QUOTE (pen411 @ Jul 15 2010, 04:27 PM) index.php?act=findpost&pid=342061

Just fyi. Hitting the gas on a fuel injected engine does nothing until the engine is actually running.
Near as I can tell the pedal isn't even physically connected to the throttle on the santa fe.

Absolutely correct. Blipping the gas pedal before starting the engine is like clicking your mouse before turning on the computer. Any benefit is purely psychological.

Then again, this whole thread is purely psychological. Guys, the next time you start your Santa Fe and it revs up a bit... pretend it's a scab and LEAVE IT ALONE :57:

 

You guys are incorrect in thinking that hitting the trottle does nothing. You are right in saying that it does not inject gasoline, but since it's a cable driven throttle body on the Sante's the inner flap must be sticking open or not sealing. I know I am not crazy in my diagoises when it did it for the dealer and all they said was my oil cap was loose, which I said was a load of BS. Thanks for your inputs guys.

 

QUOTE (mudmanmike @ Jul 16 2010, 03:42 PM) index.php?act=findpost&pid=342307

You guys are incorrect in thinking that hitting the trottle does nothing. You are right in saying that it does not inject gasoline, but since it's a cable driven throttle body on the Sante's the inner flap must be sticking open or not sealing. I know I am not crazy in my diagoises when it did it for the dealer and all they said was my oil cap was loose, which I said was a load of BS. Thanks for your inputs guys.

As mentioned previously, the pedal and the throttle body aren't physically connected.

Maybe someone will remove the intake and see if the butterfly actually moves if the engine isn't running when you press the pedal.

Even in the case you mention, the sensor should detect that the pedal position sensor and the throttle position sensor do not match and throw a code.

 

QUOTE (mudmanmike @ Jul 16 2010, 04:42 PM) index.php?act=findpost&pid=342307

You guys are incorrect in thinking that hitting the trottle does nothing. You are right in saying that it does not inject gasoline, but since it's a cable driven throttle body on the Sante's the inner flap must be sticking open or not sealing. I know I am not crazy in my diagoises when it did it for the dealer and all they said was my oil cap was loose, which I said was a load of BS. Thanks for your inputs guys.

There is no cable... all Santa Fes use electronic throttle.