Fast Idle - Hyundai Forums : Hyundai Forum
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#1 Old 03-04-2010, 02:37 PM
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steveH
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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?
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#2 Old 03-04-2010, 03:55 PM
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QUOTE (steveH @ Mar 4 2010, 12:37 PM)
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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.
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#3 Old 03-04-2010, 04:42 PM
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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.

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#4 Old 03-05-2010, 12:04 AM
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My 04 does this and as far as I know, it's normal operating procedure.

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#5 Old 03-05-2010, 01:52 AM
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QUOTE (steveH @ Mar 4 2010, 12:37 PM)
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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.

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#6 Old 03-05-2010, 10:09 AM
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I checked my 09 Limited fast idle this morning. It was 30 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.

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#7 Old 03-12-2010, 10:34 AM
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Mine goes to roughly 2000-2200 rpms' for about 10 seconds or so before settling down. Always has since new. Seems normal
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#8 Old 03-12-2010, 02:11 PM
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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.

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#9 Old 03-12-2010, 07:53 PM
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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.
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#10 Old 05-05-2010, 01:26 AM
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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?

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