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P0640 Diagnostic Trouble Code Discussion for June 2010

Intake Air Heater Control Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0640
Help Request Posted
2000 Ford F-450 Super Duty XL 7.3L Poor Idle Quality, Misfire VIN: 1FDXF46S5Y
P0640: Manifold Intake Air Heater Relay Circuit Malfunction. This truck is the NIGHTMARE of all NIGHTMARES. This truck cranks for a long time in the morn and even when it is hot it cranks too long, high pressure oil comes right up to about 450. When it does start is runs terrible, misses all the time on 1 and 3, compres...
June 02, 2010