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  #1  
Old 08-30-2012, 01:51 PM
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Revving after start up

So I got my Jeep in the beginning of summer (06 4.7 ~84,000 miles) and all the fluids have been replaced and also new spark plugs. In the last month or so, every time I start my Jeep up, it starts revving and goes north of 2,000 rpm's and then dies down, revs back up to about 2,000, goes down, then back up to right under 2. So it's fluctuating. So I usually have to sit there for 20 seconds and let it run it's course....just wondering if anyone has any idea why that may be.
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Old 08-30-2012, 04:08 PM
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Re: Revving after start up

I don't know the 4.7, but might be the idle air control valve, if that motor has one.
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Old 08-30-2012, 04:49 PM
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Re: Revving after start up

Ok thanks. I looked that up on Google and some people had the same problem I have and they said cleaning the IAC did the trick. Thanks man
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Old 09-02-2012, 03:39 PM
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Re: Revving after start up

Hey Blackout, I've noticed many have experienced the same thing with their WK 4.7's, please report back if you think the IAC cleaning/replacement fixes this. Thanks.
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Old 09-02-2012, 07:33 PM
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Re: Revving after start up

Bought some cleaner today and will be cleaning the IAC tomorrow morning. I'll post if anything changes.
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Old 09-02-2012, 08:23 PM
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Re: Revving after start up

Be careful its not the most robust item. Btw look for signs of a vacuum leak
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Old 09-03-2012, 04:12 PM
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Re: Revving after start up

So I looked online to see where the IAC valve is at, and when I took it out, it didn't look like other peoples. It didn't have the plunger look to it where I could clean it. So I cleaned what I could and then inside where it goes in. Also sprayed in the throttle body while it was running and overall thru 3 start ups, about 2 hours apart, there isn't any revving. It also seemed to run a little smoother. We'll see if this lasts. Fingers crossed
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Old 09-03-2012, 10:42 PM
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Re: Revving after start up

its been a long time since ive had a 4.7l IAC out, but Im pretty sure it has a plunger, you sure you didnt pull the throttle position sensor (just above the IAC)?
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Old 09-04-2012, 07:21 AM
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Re: Revving after start up

Ours was doing this also , I ran some throttle body cleaner through and it stopped it for a few months . Now it is doing it again.
I am not overly concerned at this point, I plan on buying a ported one from Ryan soon,lol.
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Old 09-04-2012, 12:36 PM
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Re: Revving after start up

Quote:
Originally Posted by 2005JGC View Post
its been a long time since ive had a 4.7l IAC out, but Im pretty sure it has a plunger, you sure you didnt pull the throttle position sensor (just above the IAC)?
That's why I was confused, from all the pics and replacement parts I saw online, they all had the plunger. When looking head on at the engine, it was to the right of the throttle body and closer to the top. Another thing, was that it only had 1 screw, picture online showed the IAC having 2 screws. So maybe I did the wrong thing. I'm back down at school now with no tools, so I'll have to try it again next time i'm home.
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