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P1398 Diagnostic Trouble Code Discussion for December 2005

Misfire Adaptive Numerator At Limit

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Trouble Ticket Help Requests for DTC P1398
Help Request Posted
1997 Jeep Cherokee Country 4.0L MIL Lamp on VIN: 1J4FJ78S5V
... to bad but was at a body shop !!! so it came in for a high idle tested no codes, was idleing at 2000 rpm so performed a iac test could not comand a higher idle so looking to the iac as beening stuck , did all the normal stuff pound on ti with a big hammer ...
December 16, 2005