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Unread 07-07-2010, 01:35 PM   #1
nforcer
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Idle RPMs

I posted a similar thread last week about some idle RPMs issues (or non-issues) that I am having, but I have narrowed it down more specifically so I decided to start a new thread.

After the Jeep is warmed up to operating temperature, the idle RPMs sometimes fluctuate. It will typically stay at around 650 with no air and 700 (one line below 1000) with air. However, when I come to a stop sometimes it will dip down to around 450-500. The Jeep does not stall or feel like it is going to stall. If I tap the gas it will bring it back up to around 650. The idle always goes to these two RPMs with little or no variation.

I have replaced the IAC and the TPS. I also checked the plugs and they look good. I should also note that the Jeep only has about 4800 miles on it.

I know I have read elsewhere of people having similar problems and being told by DC that it is normal. I also checked with the dealer for any relevant service bulletins, but there does not seem to be any. Is this possibly just the normal idle characteristics of the Jeep?

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Unread 07-07-2010, 01:39 PM   #2
DevilDogDoc
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Mine idles steady as a rock with 140000 miles
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Unread 07-07-2010, 01:48 PM   #3
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Mine does the same thing. Sometimes at a light it will stick around at 1k, sometimes dip to about 400 or whatever, but it DOES feel like it is going to stall out. Sometimes it idles really rough and just touching the gas pedal will put it back to normal. I just figured I would drive it till something finally gives out then start troubleshooting.

However, I it has NOT done it since I cleaned out the throttle body. I just used some cleaner and scrubbed it really good with a tooth brush. It actually made a significant difference.
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Unread 07-07-2010, 02:33 PM   #4
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I'd clean the throttle body and intake really well. That helped smooth mine out somewhat.
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Unread 07-07-2010, 03:20 PM   #5
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Quote:
Originally Posted by DevilDogDoc View Post
Mine idles steady as a rock with 140000 miles
It seems like this problem is more specific to the 04-06 TJ/LJ. At least from what I have been reading.

Quote:
Originally Posted by Sundowner View Post
I'd clean the throttle body and intake really well. That helped smooth mine out somewhat.
Sundowner, thanks again. I took off the throttle body and scrubbed it, but it was already super clean. I took it for a ride and it is still doing it. I am going to change the air filter later and see if that makes any difference.
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Unread 07-07-2010, 03:43 PM   #6
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Whoa, we haven't changed the air filter yet? I must have missed that. By all means...install a good paper element filter and see what happens!

Second option: Seafoam Spray through the intake...

Also, did you make sure to clean out that little channel in the TB that leads to the IAC? I learned about that channel the hard way.
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Unread 07-07-2010, 03:51 PM   #7
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Im having the same issue on my 05 Rubi, took it to dealer worried about the E05 oil pump drive gear failure TSB. I found out it wasnt faulty, so Im looking for the answer as well here.
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Unread 07-07-2010, 04:21 PM   #8
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Quote:
Originally Posted by Sundowner View Post
Whoa, we haven't changed the air filter yet? I must have missed that. By all means...install a good paper element filter and see what happens!

Second option: Seafoam Spray through the intake...

Also, did you make sure to clean out that little channel in the TB that leads to the IAC? I learned about that channel the hard way.
Yeah, the filter is not that dirty but you never know. I cleaned out that channel but there was not any build up in it. Seafoam spray? I am a firm believer in Seafoam, but I have never seen a spray. Or do you just put it in a spray bottle?
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Unread 07-07-2010, 05:12 PM   #9
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No, there's actually a Seafoam Spray...you remove the air intake tube at the TB, and you spray the Seafoam in through an aerosol straw. Sea Foam | Sea Foam Spray
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Unread 07-07-2010, 05:22 PM   #10
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Why spray though? You guys know water does the same thing, right? And it's free. Just put some water in a little red cup and let the booster line suck a little at a time.
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Unread 07-07-2010, 05:26 PM   #11
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Yep, you can do it with water, although I'd never suck it through a vacuum line. When I've used the water trick, I've done it with a spray bottle set on a fine mist and put it directly into the TB. I'm too clumsy...I'd end up sucking too much water through the line and royally screwing things up. Seafoam Spray is relatively idiot-proof...and I'm a pretty impressive idiot.
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Unread 07-07-2010, 05:32 PM   #12
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Quote:
Originally Posted by Sundowner View Post
Yep, you can do it with water, although I'd never suck it through a vacuum line. When I've used the water trick, I've done it with a spray bottle set on a fine mist and put it directly into the TB. I'm too clumsy...I'd end up sucking too much water through the line and royally screwing things up. Seafoam Spray is relatively idiot-proof...and I'm a pretty impressive idiot.
Me too. I iz just more careful with it. I ran an ENTIRE bottle of seafoam through my booster line and didn't notice any difference. I am not against it, I just can't see doing it again. (granted I did get wonderous amounts of smoke) which was entertaining.

The $4 can of carb cleaner made an impressive difference versus the seafoam.
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Vin's so hard core, he drinks the whole jug of STFU and then has a three hour conversation about it.
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Unread 07-07-2010, 07:17 PM   #13
nforcer
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Maybe I will give that a try. It just does not make sense to me. I seems like it should be throttle body/IAC/TPS related but it does not appear to be. I took the throttle body off today and cleaned it even though it looks like new inside. Like I said, I only have 4800 miles on the thing. Any other ideas? Someone has to have had this problem and fixed it...
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Unread 07-08-2010, 12:09 PM   #14
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OK, I replaced the air filter and there is no change. It is still happening but will always go away if I tap the throttle.
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Unread 07-08-2010, 12:11 PM   #15
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Quote:
Originally Posted by meatlord View Post
Im having the same issue on my 05 Rubi, took it to dealer worried about the E05 oil pump drive gear failure TSB. I found out it wasnt faulty, so Im looking for the answer as well here.
Does yours do it if you have the air on?
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