RPMs Increasing - JeepForum.com
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post #1 of 8 Old 07-21-2010, 07:31 PM Thread Starter
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2003 TJ Wrangler 
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RPMs Increasing

2003 Wrangler Sport 4.0
55,000 miles

All of the sudden my RPMs started bouncing up. Today was the worst. My usual idle is a line under the 1,000 RPM mark. Lately it's been going up to 1,000 and a line over 1,000 (1,250?). Earlier today I started the engine and the RPM hovered at 2,000. I turned off the engine, restarted and it rested back at 1,000 - 1,250..

AC is off.

I recently changed oil and wonder if this is the reason. I used 5W30 Synthetic. I live in Seattle. It's about 70 degrees +/- right now.


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post #2 of 8 Old 07-21-2010, 07:43 PM
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Try checking your vacuum lines.After that... when have you last cleaned your throttle body?Oil would hyave nothing to do with engine rpm!
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post #3 of 8 Old 07-21-2010, 07:50 PM Thread Starter
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I looked at the vacuum lines. I replaced the emmissions hose since it was visibly damaged. The other hoses all look fine as far as I can tell eye-balling..

Do I risk anything using that weight of oil, or should I consider changing it out too?
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post #4 of 8 Old 07-21-2010, 07:51 PM
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What about when I press my clutch in sometime and let off the gas the revs jump up a bit?? happened a couple of times

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post #5 of 8 Old 07-21-2010, 08:10 PM Thread Starter
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Mine isn't doing that. It stays at level consistently. I just went outside to see what else I might find. RPMs were down under 1,000 where I would consider normal based on my experience with this jeep. I couldn't get it to repeat this time. I checked all the hose connections. Looked at the ends to check for cracks etc.. Nothing stood out. Truly wishing I knew more about engines right now.

Only things I've done to this jeep is changed plugs, did a quick seafoam application to fuel and brake vacuum hose, and changed oil. I did check to make sure the brake vacuum hose is seated right. This problem started several weeks after that activity anyway.
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post #6 of 8 Old 07-21-2010, 08:30 PM
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sounds like a vacum leak of somekind. my jeep will idle unde 1000 when sitting but if im slowing down it stays about 1200. wich i dont mind cuhs it helps the brake booster a little more.
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post #7 of 8 Old 03-26-2011, 10:36 PM Thread Starter
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New AIC motor fixed it

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post #8 of 8 Old 03-27-2011, 12:17 AM
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a lot of times it is the IAC that needs to be cleaned i think

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rpm increase , rough idle , help , advice , tj , wrangler

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