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U1027 Diagnostic Trouble Code Discussion for July 2004

Engine RPM Missing/Invalid

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Trouble Ticket Help Requests for DTC U1027
Help Request Posted
1999 Ford F-150 Lariat 5.4L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1FTRX17L4X
U1027: Engine RPM Missing/Invalid. ... there has run into this before. This '99 F150 will sometimes rev up the RPMs on it's own. Sometimes it will die at idle and sometimes it has a hesitation when leaving a stop. We replaced the PCM about 6 months ago because of code P1636 (KAM failure). At th...
July 01, 2004