Engine idle speed high after starting - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 11 (permalink) Old 04-15-2009, 10:51 AM Thread Starter
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Engine idle speed high after starting

Hi, this is my first new post here. My 2008 commander 4.7 is great, we bought it back in March. Only problem I've had began yesterday.

I used the remote start as I was walking into the parking garage after the car had been parked for about 10 hours last night. Something didn't sound right as I was walking up to it, and it was idling at about 1,300 RPM. much higher than normal. I tried starting it a few more times last night, and it started normally, idling at whatever it is supposed to, 600-ish rpm. Then I go start the car this morning after it cools down overnight, and the same thing. It's idling at like 1300 rpm or so until I put it in reverse for a sec then back to neutral, it idles at the normal speed.

Has anyone had this problem of high idle speed after starting? I tried a forum search but could not find any similar posts. By the way, I'm loving both my commander and this forum!

Thanks
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post #2 of 11 (permalink) Old 04-15-2009, 11:02 AM
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My XK does the same thing but I think it is the "cold start" function that allows the engine to start and run easier in colder weather but mine does it most times of the year. After about 30 seconds to 1 min the idle drops to normal.

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post #3 of 11 (permalink) Old 04-15-2009, 11:18 AM Thread Starter
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Thanks for the reply. I'll see if I notice it next time and if it slows down after a minute or so. I didn't even know there was a cold start feature Maybe I just didn't notice it a few weeks ago when it was a lot colder weather.
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post #4 of 11 (permalink) Old 04-15-2009, 11:36 AM
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That's normal... that goes for majority of the cars out there, in most cases. Your engine runs efficient when it's warm. Being that you're in CO, and it's possibly pretty cold there... a cold start will make the engine rev that high initially -- once the engine temperature increases, the sound will steadily go down via idle run. This explains why you couldn't duplicate it the night before. You had already driven the XK, so the engine never really had a chance to cool down thoroughly, in short... it never needed to rev higher than it should. Does that make sense?

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post #5 of 11 (permalink) Old 04-15-2009, 11:49 AM Thread Starter
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Yeah that makes sense, and I understand that any car will run a bit faster when started cold. But it really really stood out to me yesterday, I could hear it running from outside the parking garage. Ambient temperature at the time was about 70 degrees.
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post #6 of 11 (permalink) Old 04-15-2009, 03:20 PM
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Fast idle at cold (first start of day or whenever coolant temp is almost down to ambient)
start is normal, as others have noted.
Reasons are, first, a fast idle helps the engine overcome cold oil drag and second, a fast idle helps the front catalysts light off quicker (begin the conversion process).

Hope that helped,
Rob


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post #7 of 11 (permalink) Old 04-15-2009, 03:31 PM Thread Starter
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Thanks for the help everyone, I am glad it was a false alarm and re-iterates my newbie status
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post #8 of 11 (permalink) Old 04-15-2009, 08:38 PM
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Honestly I do not remember my engine idling abnormally fast on a cold start. I have no block heater and drive my XK to work everyday in sub-zero temps. No remote start or nuttin. Go out. It is below zero degrees F. Crank it, it starts right up, clear off the ice and snow, and off I go. No high idle that I remember, at least that high...

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post #9 of 11 (permalink) Old 04-15-2009, 11:32 PM
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Quote:
Originally Posted by JJSEBASTIAN View Post
Honestly I do not remember my engine idling abnormally fast on a cold start. I have no block heater and drive my XK to work everyday in sub-zero temps. No remote start or nuttin. Go out. It is below zero degrees F. Crank it, it starts right up, clear off the ice and snow, and off I go. No high idle that I remember, at least that high...
I know what you're talking about.... being that we have the HEMI. I'm not sure about the 3.7L and 4.7L, and how those run at cold start. W/ the HEMI, cold start would go near 1K RPMs, for a seconds... within a min, it bumps to 700. It's nortmally at 600-650 RPMs. Same w/ yours?

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post #10 of 11 (permalink) Old 11-09-2011, 10:36 AM
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im having trouble guys everytime I start my 3.7 2006 i get a rough idle and when i put it in revers its worse and in drive even worse neutral no proble smooth as can be trans shifts good plugs replaced 10,000 ago no codes.

I need help Thanks

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