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perkgana 10-06-2012 03:38 PM

weird rpms / idle hanging? Is this normal?
My car feels weird. I just bought used it and its my first focus zx3

I've been reading and some people say this is normal but I decided to post a video just in case

<iframe width="560" height="315" src="" frameborder="0" allowfullscreen></iframe>

So, the car is already warm, I start it and rev's up and down fine until 1200 rpms and then seems to hang for a WHILE before getting back to 800 rpms.

Also when driving I let off the throttle for lets say 10 seconds, then when I press the cluth to shift down the engine REVs up about 200-400 rpms on its own.

Also when driving when I let off the throttle to slow down (on gear but without breaking ) the engine seems to hang at 2000 rpms for a LONG time

Are these things normal? if not any ideas of what could be wrong?

When I bought it (already felt like this) I cleaned the throttle body, run some seafoam, and tried finding vacuum leaks without luck.


boardgeneration 10-06-2012 03:51 PM

It's normal. Mine does it too. I believe I read it was part of the emissions. There was another post on here a while back on this.

perkgana 10-06-2012 04:40 PM

Thanks a lot, that makes me feel a lot more confident in my car.

Do you know if there is ways of making it not do that? I read somewhere (for mustangs) that you can make a restrictor plate or something.

boardgeneration 10-06-2012 06:14 PM

That I'm not sure of. It would be nice to stop it. It is extremely annoying. Especially with a louder exhaust. You can really hear it hang there pulling up to stops.
I haven't had time to dig into it much other than searching on here for answers.

#1fordfan 10-06-2012 11:28 PM

haven't done it to mine,but I have heard the computer can be programmed to not do this.

boardgeneration 10-07-2012 08:32 AM

^ that's what I was wondering too, maybe a tune can stop that.
I'm waiting on a tune till I get a header and better exhaust.

sailor 10-07-2012 01:06 PM

Tune can get rid of it, and it IS annoying, especially if you're used to using engine braking as much as possible as a habit. The "wait" before it starts idling down after you take your foot off is a pain - by the time it starts to slow down you're ready to grab another lower gear & go through the wait again - since once you touch the gas to rev. match the waiting period starts again...

In "regular" shifting, once I got a tach. installed, I found I had to get off the gas early when shifting to avoid the "bump" in rpm after clutching...

And yeah, it's supposed to be an "emissions" feature from what I've heard.

perkgana 10-07-2012 01:26 PM

I'm going to try finding more info on this (check link)

People seem to use it a lot on mustangs. They seem to be really easy to make or cheap to buy.

I bought this car as a daily driver and I promised my wife I will behave and not play with it too much cause I already have a few toys :D So tuning could be fun but then to make it worth messing with it a cold intake and exhaust before the tune would be kind of a good idea.. and then maybe nicer suspension and a rear disc brake conversion and there I go again... wifey will want to kill me and start bugging haha

stromberg2 10-07-2012 04:13 PM

Interesting...can that be used on a SVT?


perkgana 10-07-2012 05:07 PM

yeah, I just found them on ebay. and I got the instructions of how to make them too. Supposedly they dont throw any CEL's or hurts the car in anyway. Might be worth trying

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