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Slow return to idle rpm

 
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  #1 (permalink)  
Old 17 Sep 2017, 02:14 pm
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Default Slow return to idle rpm

Hi,

I have a problem that my engine returns slowly to idle.

Engine runs fine on idle itself and has a good response on the throttle, only a slow drop to idle rpm.

I did a quick check of the vacuum hoses (not sure if I've done them all) and the throttle cables, this looked ok to me.

Where else to look?

Its a 2.0 manual shift build 2000

Thanks for helping!

Last edited by Govert; 18 Sep 2017 at 12:32 am.
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Old 18 Sep 2017, 07:19 am
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Default Re: Slow return to idle rpm

Maybe try cleaning the throttle body, throttle plate and IAC? IDK, I'm not a mechanic, just an instigator!
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Old 18 Sep 2017, 07:31 am
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Default Re: Slow return to idle rpm

What you describe is normal with the air conditioning or defrosters on. I assume like me, it annoys you most while downshifting

I let mine get to a normal, warm idle speed, and then I unplugged the IAC. Fixed it but makes the idiot light on the dash light up.
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Old 18 Sep 2017, 10:44 am
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Default Re: Slow return to idle rpm

None of my PT's (which cover the spectrum) did this even when the AC was on. But my Charger does when cold. The throttle on the 2006 Hemi is computer controled so the PCM decides how open it should be and when.

Grab a cheap vacuum gauge or borrow one from Autozone or Advance through their loan-a-tool programs. Here's what to look for. Just remember that a leaking air idle control valve is pretty common.

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Last edited by Handy_Cruiser; 18 Sep 2017 at 10:49 am.
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Old 18 Sep 2017, 11:01 am
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Default Re: Slow return to idle rpm

Yes i also suspect the IAC now, tomorrow I start with a good inside cleaning.

Can I use brake cleaner, or should i buy carb cleaner?

Thanks guys!

Last edited by Govert; 18 Sep 2017 at 11:05 am.
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Old 18 Sep 2017, 11:19 am
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Default Re: Slow return to idle rpm

Quote:
Originally Posted by Handy_Cruiser View Post
None of my PT's (which cover the spectrum) did this even when the AC was on.
Handy none of your PT's had a manual transmission, so you have not covered the spectrum or experienced this.

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you can clean it with whatever you want, but don't expect it to make a difference. i cleaned mine so good i broke it. the plunger moves in and out by connecting to a motor driven worm gear. they're slow to move by design, and get even slower with age. i replaced mine. it was a bit better, but i like the car to slow down quickly when i'm in gear and off the gas. even with a new one it annoyed me and i was only happy when the IAC motor was unhooked
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Old 18 Sep 2017, 11:51 am
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Default Re: Slow return to idle rpm

Quote:
Originally Posted by rob302 View Post
Handy none of your PT's had a manual transmission, so you have not covered the spectrum or experienced this.
Good point, Rob. No five speed PT's ever in my stable yet. And I'm not saying you're wrong. I just haven't heard this one as a potential design flaw or perceived issue before.

At least in the OP's case, I'd still recommend looking for a vacuum leak unless like Rob, the perceived problem is really not a new issue and has always been there.


Quote:
Originally Posted by Govert View Post
Yes i also suspect the IAC now, tomorrow I start with a good inside cleaning.

Can I use brake cleaner, or should i buy carb cleaner?

Thanks guys!
Brake cleaner and carb cleaner can be any one of a hand full of different solvents. But if me, I'd use carb cleaner.

Also, has this slow return to idle always been there or is it a new condition? Rob makes a good point that this may just be perceived issue for some folks shifting a manual if the issue always been there.
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Last edited by Handy_Cruiser; 18 Sep 2017 at 12:14 pm.
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Old 18 Sep 2017, 12:26 pm
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Default Re: Slow return to idle rpm

It's drivable not a big problem, just very annoying when switching gears.
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Old 18 Sep 2017, 01:12 pm
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Default Re: Slow return to idle rpm

I wonder if this is what we have always complained about. It has nothing to do with a/c on my car. Mine is a turbo and since new the idle hangs up a bit instead of dropping when you put it in neutral/step on the clutch. I have been told that a different blow off valve or tune might correct it and that it may have been intentional to keep the boost up during shifts - not the OP's issue since he has a 2.0. It is only a split second, but it is annoying.
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Last edited by Fk5; 18 Sep 2017 at 01:49 pm.
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Old 18 Sep 2017, 02:34 pm
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Default Re: Slow return to idle rpm

yours is probably because of this(chryslers equivalent anyways):

2.jpg

IMO the people adjusting the programming from one model car to another model car weren't the most qualified and when they fixed one thing, they over complicated and screwed up another. in my ford i'm one by one getting these oddball tweaks cancelled out(in the table the two left columns are mine, the two right ones are the factory tune) i have hundreds of tables like this where getting rid of their 'fixes' and just entering correct data in other places makes the car run and drive better. i wish they made this for a PT. i'd go get another
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