Cold Start Idle Speed

[Rubicon6MT]

After a cold start, I always wait until the engine RPM drop before beginning to drive.

In warmer weather, the low idle speed was always 600 RPM.

I’ve noticed as the weather has gotten colder the engine now wants to idle at 900 RPM.

It seems like I would have to wait a long time for the 900 RPM idle to drop down to 600 RPM.

Has anyone else noticed this, and if so, any explanation?

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[Gvsukids]

After a cold start, I always wait until the engine RPM drop before beginning to drive.

In warmer weather, the low idle speed was always 600 RPM.

I’ve noticed as the weather has gotten colder the engine now wants to idle at 900 RPM.

It seems like I would have to wait a long time for the 900 RPM idle to drop down to 600 RPM.

Has anyone else noticed this, and if so, any explanation?

https://www.jeepgladiatorforum.com/forum/threads/idle-speed.77360/

 

[Rubicon6MT]

https://www.jeepgladiatorforum.com/forum/threads/idle-speed.77360/

I saw this, it’s a post about idle speed being too low.

What I’m looking for is information about two different warm idle speeds.

 

[Gvsukids]

I saw this, it’s a post about idle speed being too low.

What I’m looking for is information about two different warm idle speeds.

https://www.jeepgladiatorforum.com/forum/threads/idle-at-start-up.69155/

https://www.jeepgladiatorforum.com/forum/threads/pentastar-v6-idle.31342/page-2

 

[jav_eee]

the explanation is you don't have to wait until it gets to 600 rpm. you'll be alright.

 

[nanook12]

After a cold start, I always wait until the engine RPM drop before beginning to drive.

In warmer weather, the low idle speed was always 600 RPM.

I’ve noticed as the weather has gotten colder the engine now wants to idle at 900 RPM.

It seems like I would have to wait a long time for the 900 RPM idle to drop down to 600 RPM.

Has anyone else noticed this, and if so, any explanation?

what engine are you referring to?

 

[Rubicon6MT]

what engine are you referring to?

3.6L

 

[DylanM]

Your engine idles at a higher rpm because the PCM is programmed to do so when the weather is colder for better/quicker warm up. Don't fret about it. Just start her up, wait a moment for the initial 1000+ rpm surge to subside then drive off.

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