June 18, 1999 Service bulletin

Several revisions have been made to the idle strategy of the 4.7L engine

Jeep technical service bulletin 181599 for 1999 Jeep Grand Cherokee.

Bulletin number: 181599
Component: Engine and engine cooling: engine: gasoline
Summary: Several revisions have been made to the idle strategy of the 4.7l engine. One change is to the upstream oxygen sensor (o2) biasing / switching when the transmission is in park or neutral. Tt

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