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Old 08-06-2012, 06:56 PM   #1
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Running too rich

I've been battling my '97 Wrangler for nearly a year now. It has been running too rich, in fact the fuel injectors are pushing twice as much fuel into the cylinders than normal. I have a 4 cylinder and its getting about 7-10 MPG. It floods out when idling, but runs smooth at cruising speeds . I have put in a new fuel pump and MAP sensor. I have also had to replace the catalytic converter because the old one became so clogged from the engine not burning properly. I recently had the computer tested and told there is nothing wrong with it.

I am at a loss with what to do. I really hope all of you Jeep men can help me out. I'm only 22 and money is getting really tight when it comes to my Jeep. Hope you can help out!!

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Old 08-06-2012, 07:01 PM   #2
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O2 sensors need to be replaced with OEM ones ideally. If your check engine light is on then it will run rich by default just FYI. Replace the 02 sensors and reset the computer and see what happens.

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Old 08-06-2012, 09:27 PM   #3
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Getting any misfire codes? Does it loose pressure at the fuel rail shortly after you turn it off? Does it take a long crank or a couple cranks to start? I ask because I'm wondering if you have ruled out a bad injector(s) or the o-rings on them that connect them to the engine port. I'm basing this off of my issues with them on my 4.0 I6, not sure if the fuel rail is set up the same on your 4-cyl. If you don't have a hard time starting it, I'd agree with new O2 sensors as a good place to start.
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Old 08-07-2012, 03:47 PM   #4
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Quote:
Originally Posted by bwpilot20 View Post
O2 sensors need to be replaced with OEM ones ideally. If your check engine light is on then it will run rich by default just FYI. Replace the 02 sensors and reset the computer and see what happens.

Forgot to mention that the O2 sensors have been changed several times.
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Old 08-07-2012, 05:14 PM   #5
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Ok, next question is, have you cleaned/changed the IAC? I'm also leaning towards a fuel rail problem as stated above. If the computer can't slow the fuel flow down then it'll be rich.
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