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#1
11-29-2003, 10:18 PM
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89 Cherokee Bad Mileage/Smoking
Have an 89 Cherokee 4.0. Just bought approx. 2 weeks ago, my 2nd Cherokee.
When sitting still, it's belching black smoke. Upon acceleration, it smokes. Gets 5 mpg and is running rich. Was told that the oxygen sensor would correct that. Changed oil (& filter), air filter, plugs, plug wires, and oxygen sensor. Put a fuel treatment in. Still gets 5 mpg and it still is running rich. Any suggestions? 
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#2
12-06-2003, 04:28 PM
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Re: 89 Cherokee Bad Mileage/Smoking
There's an oxygen sensor electrical relay that might be defective it's fairly cheap. I've found them on the web for under $10.00
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#3
12-06-2003, 06:48 PM
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Re: 89 Cherokee Bad Mileage/Smoking
Thanks. I appreciate this tip. Off to look for one. I'm desperate, as I don't want to get rid of this Jeep, but it's killing me financially (because of the gas mileage). My other Cherokee was totalled and needs front end work, which I hope to undertake next year, so it cannot be driven.
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