What is "normal" engine idle speed for a 2.5? - JeepForum.com

 
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post #1 of 14 Old 09-11-2007, 04:41 AM Thread Starter
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Need help with my 2.5 high idle

What is the "normal" engine idle speed for a 2.5? I just read about 100 threads and couldnt find an answer.

thx

*EDIT* this question has been answered- but rather than start a new thread, I just changed the thread name (i think) and added some more questions below


Last edited by +GRAVES+; 09-19-2007 at 03:21 PM.
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post #2 of 14 Old 09-11-2007, 06:12 AM
duglas25
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I would like to know too.. mine seems like it idles low and rough, but the set screw is IMPOSSIBLE to get too and I am not sure if it is too low or normal

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post #3 of 14 Old 09-11-2007, 06:17 AM
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Mine idles smoothly around 750 RPM. Been that way since I bought it with 48k miles on it. It now has 143k miles on it.

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post #4 of 14 Old 09-11-2007, 07:48 AM
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Yeah, around 700-800 rpms is good for most any engine, and it should be smooth. It shouldn't have to go near 1000 to get smooth though.

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post #5 of 14 Old 09-11-2007, 09:15 AM
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Quote:
Originally Posted by Roughneck
Yeah, around 700-800 rpms is good for most any engine, and it should be smooth. It shouldn't have to go near 1000 to get smooth though.
x2..............

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post #6 of 14 Old 09-11-2007, 09:48 AM
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Mine stayed right around 650 to 700 from what I remember, and wasnt rough.

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post #7 of 14 Old 09-11-2007, 10:06 AM
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Base idle speed

For future reference the idle speed is listed under the hood of most 1995 and newer vehicles on the emissions sticker.
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post #8 of 14 Old 09-11-2007, 11:33 AM
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Yep, mine idles around 700-800 too.

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post #9 of 14 Old 09-11-2007, 11:35 AM
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i'd say about 700 for me.

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post #10 of 14 Old 09-11-2007, 03:03 PM Thread Starter
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Quote:
Originally Posted by Evil Monkey
For future reference the idle speed is listed under the hood of most 1995 and newer vehicles on the emissions sticker.
Thanks for the 411. I thought for sure this would be in the FAQs on this site, but it isnt.

Mine been idling about 850-900 & it seems "just" a bit high. I was zipping thru the parking garage last night & I didnt even have my foot on the gas pedal

Would cleaning out the throttle body or (*suggestions here*) help bring it down?
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post #11 of 14 Old 09-12-2007, 09:37 AM
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If there is a laquer buildup in or around the venturi's (if they're even still called that), then it needs cleaning. I don't think the idle speed is adjustable, so if it is fast I think a sensor is telling the computer to speed it up. Technology is great haha.

I washed the engine in a 1990 truck that I keep around, and I got a sensor wet. The engine "idled" at 3000 rpms for days until it dried out. Luckily it's a manual trans.

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post #12 of 14 Old 09-12-2007, 10:03 AM
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1000 when it first starts or when you are coasting to a stop in neutral and 750 at idle when sitting, it kind of bumps up and down about 25 rpms or so

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post #13 of 14 Old 09-12-2007, 02:27 PM Thread Starter
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Quote:
Originally Posted by HowIRoll
1000 when it first starts or when you are coasting to a stop in neutral and 750 at idle when sitting, it kind of bumps up and down about 25 rpms or so
yeah mine is about 850-900... as I said it seemed "just a bit high". I'll spray out the throttle body & see what happens.
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post #14 of 14 Old 09-19-2007, 02:22 PM Thread Starter
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Quote:
Originally Posted by GRAVESTONE
yeah mine is about 850-900... as I said it seemed "just a bit high". I'll spray out the throttle body & see what happens.
Ok I was looking at another thread about the 2.5 idle speed. Please correct me if I am mistaken. If the idle is high, the IAC might be bad and if the idle is erratic, its possibly the TPS. I also read I should check the codes to see if my O2 sensor is bad, as that also might effect the idle.

My idle is not erratic, but seems to be about 100+ rpm faster than i think it should. On a flat surface, I can zip around in second gear without even touching the gas pedal. I sprayed out the throttle body & it seemed to help a little.... but not much.

So to narrow it down, possibly a bad IAC or O2 sensor? Any other suggestions?

thanks
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