Some 2007-08 Ford F-150 pickup trucks with 4.6-liter engines may run rough, hesitate and/or backfire, usually on the first drive following an overnight soak. The problems usually occur when the outside temperature is below 60 degrees, and typically last for only 20 to 40 seconds or until the engine goes into closed-loop fuel control.
On investigation, you'll probably find the check-engine light off and no trouble codes stored. Ford Motor Co. attributes all these issues to software issues in the PCM. Reprogramming the module with updated software is the only remedy. Check with a dealer for the specifics of the flash.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected]crain.com.