Question about 1998 Jeep Cherokee

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Runs rough, black smoke, computer bank 1 burning too lean

1998 jeep grand cherokee running rough. black smoke out of the tail pipe. computer check says bank 1 burning too lean. what is the problem?

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  • cfox56 Apr 19, 2009

    checked the O2 sensors, replaced the front one, replaced plugs also because of burn out with the O2 problem. runs fine now



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  • 9 Answers

Sounds like bad injectors, bad O2 sensors, and or too much fuel psi. Check the fuel psi against what the service manual says. If the fuel psi is too high, your regulator is bad. If the fuel psi checks out ok, you likely have a bad O2 or bad fuel injector(s).

Posted on Apr 15, 2009

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what smokes. we are blind here.
you must stay.

1: end of tail pipe smokes
2: or, with hood up the exhaust manifold smokes due to oil we dropped there. (common on much service)
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