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Old 07-29-2010, 12:51 PM   #1
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Engine runs very rough in morning.

Hey guys, I've had this problem for a month or two now. After leaving my jeep parked overnight or for an extended period of time 8 hours or so, after starting it up it runs very rough for about 2 minutes and then it smooths out and runs fine. I've replaced my upstream o2 sensor and cleaned my IAC and that didn't help it. Anyways I uploaded a video to youtube where you can actually hear my problem. please take the time to watch just the first 30 seconds to hear my problem and let me know what you think it could be. I have a 1997 Jeep wrangler TJ with an automatic transmission. Any help is greatly appreciated.

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Old 07-29-2010, 05:00 PM   #2
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When was the last time you did a tune up?

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Old 07-29-2010, 05:32 PM   #3
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x2 on the tune up. sounds like it's missing. or, does it smell like it's running rich?
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Old 07-29-2010, 08:41 PM   #4
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The O2 sensors really don't do anything the first 2 minutes -= it's still in open loop.
Rough before it goes into closed loop is most often a vacuum leak somewhere. Once it's in closed loop it compensates for the leak.

Check all vacuum lines, check the manifold gaskets. Spray around a burnable carb cleaner to find the leak. Or use propane.
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Old 07-30-2010, 05:46 AM   #5
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Quote:
Originally Posted by rrich View Post
The O2 sensors really don't do anything the first 2 minutes -= it's still in open loop.
Rough before it goes into closed loop is most often a vacuum leak somewhere. Once it's in closed loop it compensates for the leak.

Check all vacuum lines, check the manifold gaskets. Spray around a burnable carb cleaner to find the leak. Or use propane.
X2, well said.
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