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I have a whole slew of problems with my Si, and I need some clarification.

I've had my car in the shop 3 times. I live in South Florida, so I don't know why my car idles high when its cold.

If my car has been sitting for any length of time, it idles up to 1800 - 2000 RPM's, and slowly declines as the car warms up.

The thing is, I cant drive my car unless its warmed up full. If I fail to let it warm up, it bucks all over the place and drives like **** until I turn it off and fire it up again (warm).

I only know this cause my stop and go life.

I got a bunch of other problems, but do other Si Owners have the same issue?

I got the sedan.

 
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sounds like an iac sensor to me, controls air at idle, would cause a high idle

 
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If that sounds like what it is, does that mean that you don't have the same problem? And how the heck do I get Honda to admit that this is whats wrong?

 
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problem with having honda fix it is your going to have to leave it overnight, so that they can replicate the problem(i work for a dealership, i know the procedure), then when the replicate the problem, they have to diagnose it, and troubleshoot it, and if u dont have a check engine light, it may be hard to diag, be patient with them, its not always as fast as u might hope, but they should offer you a rental at a low price

 
Rep Power: 813

um thats called normal warmup man. ive seen mine idle above 2500rpms when it gets down to 0 degrees F. the colder it is, the higher the start idle. and yea it could get jumpy switching from park to rev to drive, because when you shift into gear the idle must drop, and the ecu is trying to keep it higher so the cat can warm up faster. almost every car make and model does this. the dealer and any other competent mechanic will laugh at that "problem." now if there is a real idle problem like once youre in gear the idle still fluctuates, you just need to relearn the idle speed. warm up the car to normal temp, turn off engine, pop the hood and remove the FI ECU fuse in the box by the battery, or just disconnect the battery for a few secs. put everything back, start the car, and let it idle for 10 mins with hood closed. do not use any accessory or press the gas during this time. then turn car off in 10 mins. it should be set. this needs to be done anytime the battery is disconnected (which resets the ecu).

 
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The service department that I got it at told me that the car is suppose to do that, and its normal.

Are you also saying that this is not common for an Si to do?

I do not get a light no, and I get a feeling the dealership doesnt want to admit there is a problem. I live in South Florida, so its not like the engine really gets stone cold.

This isnt common with the Si's is it?

 
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I have a 2007 civic si sedan, and it does the same thing. It goes up to 2000 rpm when I first start it up and sometimes it just drops down 2000 to 1500 rpm in an instant, most of the time it just gradually goes down as the engine warms up. I thought it was strange cause my friend has a 2007 civic ex and on a cold start it just goes to 1500 rpm. I'm also curious to hear how many 2007 si owners this is happening to, and is it really normal?

 
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well from what ive seen, it happens on my 02 civic, my parents 92 accord, my bros rsx, and pretty much any car with OBD system installed. its normal, dont worry about it anymore.

 
Rep Power: 267

Higher RPM is to help the engine warm up quicker. The reason it bucks is because all of the fluids in the system are still cold and need to warm up. For example, i have a hydraulic clutch, and while the fluid is still cold the clutch really grabs differently and the car bucks around, the steering is hydraulic so it feels more natural and crisp (you have electric so no difference between hot and cold). What you have is perfectly fine. I cant believe that after 3 trips, mechanics havent been able to figure this out...try going to another shop, those guys dont seem to have a clue.

 
Rep Power: 267

Not a problem at all. The dealer is being completely honest with you. My car does this, my dads car does this, my moms car does this, my brothers, etc.etc. My old 98 neon didnt because I am guessing it didnt have the feature installed, so it just always idled at 1000, took forever to warm up.

This morning at 7am it was really cold my car was idling at around 1700rpm
when i left class a few hours later after the car was completely cool it idled at 1500 cause it was warmer out...

its fine, just enjoy your Si

 
Rep Power: 322

its normal, it even saids in your manual. Just like the others said, it revs high to heat the engine faster. You can cold start and just drive right away if you wanted to. I know the manual mentions to keep it at low rpm shifts until the engine fully warms up.

Your options are,
leave alone
wait till it fully warms up before driving
get remote start have your car warm itself in the morning

 
Rep Power: 264

wow have any of you ever owned a car before? I think every car I've every owned / started up car does that. My turbo 02 civic goes to 1500-1800 rpm.........2000rpm sounds ok, especially with a high rpm range on the si

#1 problem in the car business, uninformed customers
No offense but get your owners manual out man. Tells ya everything you need to know!

 
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Well, it seems like the consensus is that the car needs to heat up the fluids first, and that the high idle is meant to help this process.

I also have a manual vehicle for the auto poster, so I guess I have control over this by keeping the rpms really low while the car warms up.

In sum, I guess we can put this one to bed.

I did have the car checked out at two different services departments just so you guys know.

I'll have to start another thread about the rubber duck.
In the morning when the engine knocks around, it sounds like there is a rubber duck under the hood. When the car gets warms, it seems to do this less (during shifting when the engine knocks around).

Thanks guys

 
Rep Power: 250

just to reinforce it, i have a k20a2 and it idles around 1900-2000 during warmup. if it were doing it randomly while your car was warmed up, and fluctuating when you came to a stop or something, that's when something isn't right.

 
Rep Power: 813

spray the accessory belts with some belt dressing (special product in a can, NOT armorall or tire shine).

 
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If you have first morning startup complaints you need to drop off the car the night before. You cannot fix something you cannot confirm...........the dealership needs to be the first ones to start it up in the morning

 
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the car has 4500 miles on it. I'm not spraying anything.

 
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Oh you mean for the rubber duck. No no. I think it is related to springs or something. Maybe the engine mounts?

 
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DO not spray your belts. I have an 03 si and it does it too. The bucking is your vtc adjusting your cam timing. My em2 did not buck at all its ok it gives the k20 character. I try to keep mine under 3k rpm when shifting while its cold it tends to buck less.