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Unread 07-29-2005, 08:23 PM   #1
ncjeepinyj
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Join Date: Aug 2004
Location: Mooresville NC
Posts: 1,075
4.0 TB question

I just did the 4.0 tb swap on my 2.5 the other day. It runs great, idles good but i have one question. Every time i start the jeep now it seems to idle high at first (sometimes 2000rpms) for a few seconds, is this normal? I know when you first do the install and start it the first time it will idle high until the computer resets/readjusts the the new TB, but mine seems to almost every time i start it now. So, does it sound like something is wrong or is this normal?

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Unread 07-29-2005, 08:59 PM   #2
Rock1127
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Join Date: Jun 2005
Posts: 129
That may be normal.

My Jeep has idled around 2000rpms everytime i've cranked it since i've owned it. It stays there maybe 1 or 2 seconds and then comes down to around 500rpm. My friend's does the same thing. I don't think it's anything to worry about. I could be wrong, but my engine's run great since i've bought it.
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Unread 07-29-2005, 09:02 PM   #3
ncjeepinyj
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Join Date: Aug 2004
Location: Mooresville NC
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Thanks for the quick response. I believe mine did idle a little high for a few seconds before the swap but not 2000 rpm's like it does now. Guess it is just the bigger bore letting it idle a little higher.
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