20 Most Recent 2003 Ford F350 Super Duty DRW SuperCab - Page 6 Questions & Answers

Could be a problem with a blend door under the dash.The blend doors are controlled by vac or electric motors and direct air thru the heater core and the vents. Defrost is the default position when the HVAC system is not working.

Sounds to me that it has jumped it timeing. This will make you not have any oil pressure and will also make it back fire. You will need to replace the timeing chain and inspect the gears to see if they are worn. And if the show signs of wear change them. You only want to do this onec.

has got an air lock somewhere

The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The Engine and Automatic Transmission (not applicable to manual transmissions) in this vehicles drive train are fully electronically controlled by a computer called the PCM and TCM (Power Train Control Module, Transmission Control Module). When a problem like this or other drive-ability related problems occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM. Also always check fuel pressure for correct spec for your make and engine type. Also engine mechanical problems ca cause many drive-ability related problem such as rough idle and other symptoms

Torque converter lockout solenoid

pinpointed the problem, glad to share my solution for just $15.99 plus shipping & handling.

You can get this info from Autozone or their Repair guide or library with Chilton Repair books. I do know, it will be difficult as my Crown Vic has the same thing in it and can only tell you where to find info