2.0L Long High Idle

[jayvis]

I'm wondering if anyone else's 2.0L Wrangler has an unusually long high idle at start up. Mine idles at around 1600 rpm at start up for at least 90 seconds before idling down to around 1100. This is regardless of temperature. I can drive 50 miles, shut the Jeep off for 10 minutes and it will do the same thing when I start it again. It's almost like the idle setting is based on time instead of operating temperatures.

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[IronScott]

I'm wondering if anyone else's 2.0L Wrangler has an unusually long high idle at start up. Mine idles at around 1600 rpm at start up for at least 90 seconds before idling down to around 1100. This is regardless of temperature. I can drive 50 miles, shut the Jeep off for 10 minutes and it will do the same thing when I start it again. It's almost like the idle setting is based on time instead of operating temperatures.

Mine definitely does it cold. I timed it once and it was about 90 seconds. I haven't noticed it after it's been driven.

 

[TJ2018]

My 2.0 idles high at cold start up as well. But like @IronScott I haven't noticed it when started up warm either.

 

[jayvis]

Do you guys think that a 90 second high idle is excessive, especially on a warm morning? I plan on asking my dealer's service manager about it but wanted to hear some other owner experiences first.

 

[Minty JL]

Its for emissions. The computer is programmed to run them high and lean to get the engine, cats and O2 sensors up to temp faster.

The faster the system gets into closed loop the better for the earth

 

[jayvis]

Its for emissions. The computer is programmed to run them high and lean to get the engine, cats and O2 sensors up to temp faster.

The faster the system gets into closed loop the better for the earth

That seems to be counterproductive since I was always told that driving a modern vehicle between 30 and 60 seconds after startup was the quickest way to get everything up to temp. I'm a little afraid to shift out of park while it's still high idling.

 

[Minty JL]

I agree, and running a motor lean is not great for long term durability either.

A good friend of mine is a tuner/engineer and most manufactures are doing it. On my Colorado he actual deleted that program from the PCM.

 

[White2019Rubicon]

I'm wondering if anyone else's 2.0L Wrangler has an unusually long high idle at start up. Mine idles at around 1600 rpm at start up for at least 90 seconds before idling down to around 1100. This is regardless of temperature. I can drive 50 miles, shut the Jeep off for 10 minutes and it will do the same thing when I start it again. It's almost like the idle setting is based on time instead of operating temperatures.

I've noticed that My 2019 JLU Rubicon does the same thing. Question is should we wait until it drops or just carry on and put it into R or D?

Thanks

 

[DesertFox]

No reason to wait unless you want to. Nothing in the Manual about it, once you have good oil pressure it is safe to drive off.

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