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Old 10-06-2011, 08:36 AM   #1
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Help!! Fuel System Lean

'97 Wrangler.
Two months ago I finally got around to fixing my Jeep which consisted of me changing the Fuel Pump, Catalytic Converter, Spark Plugs, Air Filter, both O2 Sensors. Before I had a Fuel System too lean reading, which led me to the Fuel Pump eventually. Since I had let it go for so long it had caused my CC to plug and that's why it was changed.

But now, the Fuel System Too Lean is coming back up on the computer. What else can I do??

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Old 10-06-2011, 09:17 AM   #2
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What code(s) is the jeep throwing out? I'll check All Data Pro when I get home from work and get back to you.

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Old 10-06-2011, 09:19 AM   #3
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Also could be a vacuum leak just off the too of my head, easy was to check is get a can of b-12 ,start the engine and lightly spray all vacuum hoses and connections if the engine revs you found your leak
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Old 10-06-2011, 09:32 AM   #4
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You didn't say anything about the exhaust manifold... I would check for a crack in your exhaust manifold that would allow air to enter and lean the exhaust.
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Old 10-07-2011, 06:17 PM   #5
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Quote:
Originally Posted by fabrikate_it View Post
What code(s) is the jeep throwing out? I'll check All Data Pro when I get home from work and get back to you.
P0171... The problem is its not running to lean because its using gas like its going out of style. Just went 125 miles on a 19 gallon tank essentially.. Not good.
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Old 10-07-2011, 06:18 PM   #6
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Earlier I was revving it and it shot black smoke out everywhere.
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Old 10-07-2011, 06:23 PM   #7
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MAP sensor?
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Old 10-07-2011, 06:34 PM   #8
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Here is the situation.. It says its running to lean, but I know for a fact that its not. It is running entirely to rich. The last two years with this vehicle have been absolutely miserable. I love my Jeep, but this is just ridiculous. If anyone can understand this please help!!
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Old 10-07-2011, 06:36 PM   #9
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MAP sensor?
Do you think it could be it? It is one of the only things left that I have not replaced.
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Old 10-07-2011, 10:37 PM   #10
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That's why I asked you if you have a crack in your exhaust manifold. The O2 sensors are seeing a lean exhaust stream so the engine compensates by richening the fuel mixture. That is why you are setting a lean code and burning extra fuel. You're getting dirty air in the system somewhere.
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Old 10-07-2011, 10:47 PM   #11
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Had this happen in my pickup. Intake gasket cracked
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Old 10-12-2011, 12:18 PM   #12
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Well I tried the MAP sensor.. No luck.. I don't think I have any gaskets cracked, I sprayed ether around the gasket and no effect.
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Old 10-12-2011, 12:23 PM   #13
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Quote:
Originally Posted by jumpman23
Well I tried the MAP sensor.. No luck.. I don't think I have any gaskets cracked, I sprayed ether around the gasket and no effect.
Have you checked for exhaust leaks? Have you looked for cracks in the exhaust manifold?

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