Trouble Ticket Help Requests for DTC P0640
|1999 Ford Econoline Super Duty Custom 7.3L MIL Lamp on VIN: 1FDXE40F2X
P0640: Manifold Intake Air Heater Relay Circuit Malfunction. The check engine light goes on and off and the bus runs rough and lacks power. when it warms up it runs a little better but not good. It also smokes blue on acceleration when it is warm. The The engine cranks well and evenly. I am leaning toward #3 and #5 inje...
|June 04, 2014|