1990 XJ 4.0 running rich - JeepForum.com

 
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post #1 of 9 Old 02-10-2009, 08:33 AM Thread Starter
4hrs2Moab
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1990 XJ 4.0 running rich

I just bought this Jeep last night. The PO put new battery cables and battery in it, but they didn't put the cables in correctly. It barely ran when i picked it up but i drove it to a parking lot and discovered the ground strap from the valve cover to chassis was broken so I connected that and it idled smooth, lights were bright again, gauges worked, but it didn't solve the problem of running rich. I will rev it up and the damn thing smokes like a diesel but while driving, I cant see visible smoke out the window. My friend that was following me said it still stinks while on the freeway. What might be wrong? Oxygen sensor? CTS? TPS? BBQ?

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post #2 of 9 Old 02-10-2009, 08:38 AM
balloo93
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More than likely the O2 is out or on it's way out. How many miles on it?

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post #3 of 9 Old 02-10-2009, 08:54 AM Thread Starter
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post #4 of 9 Old 02-10-2009, 08:57 AM
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post #5 of 9 Old 02-10-2009, 09:01 AM
tjwalker
It's the crank sensor!
 
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Might not hurt to run a compression test on it so that you know where you're at (somewhat) mechanically. Only takes some of your time. Don't want to be chasing your tail here....

Did the previous owner have anything to say about this or oil consumption?

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post #6 of 9 Old 02-10-2009, 09:12 AM
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Quote:
Originally Posted by tjwalker View Post
Did the previous owner have anything to say about this or oil consumption?
Here is the original ad that Mat found the Jeep on:
http://www.ksl.com/index.php?sid=&ni...iew&ad=1091463

1981 CJ7
2001 XJ
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post #7 of 9 Old 02-10-2009, 09:16 AM Thread Starter
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post #8 of 9 Old 02-10-2009, 09:45 AM
1990JEEPXJ
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it could be a loose vacuum line somewhere. maybe the map sensor as well.

Completely stock, and keeping it that way...

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post #9 of 9 Old 02-10-2009, 09:59 AM Thread Starter
4hrs2Moab
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where is the map sensor? is it mounted up on the firewall? that was missing but i took it off the other jeep thats at my house and it still smoked
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