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Unread 10-17-2008, 05:24 AM   #1
Cactus737
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1997 TJ Wrangler 
 
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Engine runs rough intermittently, runs rich...

My check engine light came on so I changed the oxygen sensor. It still runs rough occasionally and the exhaust really stinks like it's running rich. It almost seems to misfire like the ignition timing is off. Could it be the vacuum? Is this a common problem? Is there an easy fix? Thanks, Scott.

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Unread 10-17-2008, 05:52 AM   #2
Rocky529
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Pull the code.
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2004 Jeep Wrangler Sport - 5 speed

Silver Metallic finish with black dual tops - Dana 44 Rear
2.25" Suspension Lift with Old Man Emu Shocks
Performance Accessories 1" Body Lift
Daystar 1" Motor Mount Lift
Spidertrax 1.25" Wheel Spacers - 32"x11.5" MT/R Tires
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Unread 10-17-2008, 06:50 AM   #3
lilboy1023
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I agree with pulling the code. It could be a clogged cat.
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Unread 04-22-2010, 07:20 AM   #4
Cactus737
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Still Running Rough

Changed the spark plugs and wires and put in a new ignition coil and still runs rough. I'm at my wits end. Any more ideas? Thanks.
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Unread 04-22-2010, 07:25 AM   #5
Alex74012
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dont throw parts at it,just pull the stinkin codes
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Unread 04-22-2010, 07:32 AM   #6
Wheelin98TJ
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You don't even need a scanner to pull the code.

You can do it yourself in seconds. Here's how:

How do I retrieve diagnostic trouble codes when there is a check engine light illuminated?
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Unread 04-22-2010, 07:50 PM   #7
Cactus737
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Already HAD pulled the codes. Indicated miss-firing on various cylinders. No further codes.
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Unread 04-22-2010, 08:40 PM   #8
Wheelin98TJ
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Well it helps to state what the codes were and that you did pull them.

Did you also replace the cap and rotor?

What kind of replacement plugs did you use?

Have you done a compression test on the cylinders that the misfire codes refer to?
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