Issues with 4cyl. -
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post #1 of 4 Old 05-16-2012, 08:54 AM Thread Starter
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1999 XJ Cherokee 
Join Date: Feb 2012
Location: Clifton
Posts: 27
Issues with 4cyl.

This little YJ is receiving way to much gas or maybe it has more than what the eye can read, the 4cyl. has gas mixed in with oil. With little mechanical knowledge, way to much gas is going in the combustion chambers and not enough is getting burnt! We(In-laws and I) thought the O2 sensor was bad, so I replaced it last night. Before replacing the O2 sensor, the jeep ran real crappy, it had a low idle and when it would pick up it sound like an old John Deere tractor....

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post #2 of 4 Old 05-16-2012, 09:13 AM
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1996 ZJ 
Join Date: Dec 2010
Location: The Great Big Box
Posts: 5,936
Check all of your vacuum lines, replace them if they're more than a few years old (all of them). Check your MAP sensor as well, ontop of that make sure there's no exhaust leaks before the cat, because it can throw everything off and cause your computer to think its running lean, thus dumping more gas into the intake. Replace all of your spark plugs, plug wires, distributor, rotor, even things like changing air filters and fuel filters can help.

Basically, do a full tuneup. These are high maintenance vehicles, they like to be loved.

All about that unibody life.
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post #3 of 4 Old 05-16-2012, 09:31 AM
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1989 YJ Wrangler 
Join Date: Apr 2008
Location: Detroit
Posts: 24,647
When you replace any sensor you need to do a battery disconnect to clear the computer calibration and fault codes. Disconnect it for a long 10 count. It seems like your post was cut off. How is it running now?

Check for codes:
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post #4 of 4 Old 05-22-2012, 05:05 PM Thread Starter
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1999 XJ Cherokee 
Join Date: Feb 2012
Location: Clifton
Posts: 27
The darn jeep won't start now! I changed the spark plugs, waiting to replace the spark plug wires and inspect the cap & rotor, maybe the map sensor needs replaced also
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