Strange idle
10-29-2013, 08:53 PM
#1
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Year: 2001
Model: Cherokee
Engine: 4.0
Strange idle
So my Jeep (2001 XJ 4x4 automatic) has been running weird lately. Basically it started to idle really rough as if it was going to die while I am stopped. Also, it feels like I have no power. I literally floored it and it slowly climbed to 30 mph before bolting forward. I just replaced all my vacuum lines since I was getting the engine code saying "EVAP leak large". I reset the computer, so at this point in time I don't have an engine code. I thought this would solve the problem, but it still idles rough. Mind you it doesn't always do this, only every now and then. I'm planning on pulling my throttle body off and cleaning it. Anyone ever experience this or have any suggestions? This is my daily driver, so I need it to run properly. Thanks for the help in advance.
10-30-2013, 09:54 AM
#5
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Year: 99
Model: Cherokee
Engine: 4.0
leaks in the evap system can be tricky to detect, but this one sounds like it would be pretty easy. you can have the system fogged and it will show a leak. the other thought is that its tune up time. the first thing that comes to mind is the o2 sensor, but you need to go through the entire system and clean /replace what needs it. does it do it at WOT?
10-30-2013, 10:48 AM
#6
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Year: 2001
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What's WOT? Also, I replaced all the hoses and so far the check engine light isn't on. I would think that if it was an O2 sensor, the CEL would be on. I'm definitely going to clean the throttle body and I'm probably going to run some seafoam through it as well.
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10-30-2013, 11:12 AM
#8
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From what I've read about the diagnotic system in the '97 and newer XJ's not all O2 sensor problems (or some other sensor problems) set off the CEL. A scan tool should give the problem code/codes.
10-30-2013, 01:34 PM
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Year: 2001
Model: Cherokee
Engine: 4.0
Yes when I'm WOT I have no power. I leterally floored it and it took forever to get to 30 mph and then all of a sudden I had full power and the Jeep went forward fast. I've also noticed that I'll have the Jeep on cruise control and I can tell it struggles for power. Like I said, it only happens every once in a while.
10-30-2013, 04:14 PM
#13
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Could be a number of things electrical and/or fuel supply related. I'd start with the free stuff first. Have it checked at your local parts store that gives free diagnostics. You want it scanned for codes and have them test the battery,starter,alternator,and charging system.
10-30-2013, 04:23 PM
#15
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I had a low idle problem recently that was caused by a dirty IAC and CTS. No CEL.
Both may be new but I'd want them tested under a load. And you don't want to get into randomly replacing parts.
Both may be new but I'd want them tested under a load. And you don't want to get into randomly replacing parts.