how to fix trouble codes pp2106,p2104,p2111 on a 4.6 liter,2004 ford f-150

Question

how to fix trouble codes p0351,p0356,p0506 on a 4.6 liter,2004 ford f-150

Answer 1

P0351 Ignition coil A primary / Secondary circuit malfunction

P0356 Ignition coil F primary / Secondary circuit malfunction

P0506 Idle air control system lower than expected

For P0351 and P0356 are similar code condition, this can be from poor connection at the igntion coil, or the secondary ignition seeking ground.

   Here is a sparkplug condition with P0351 and P0356 had occured. when the sparkplug was inspected it had a heavy thick amount of dielectrical grease. Dielectrical grease is used for the prevention of the sparkplug boot sticking onto the sparkplug, but in the case a heavy use of dielectrical grease created a P0300 and P0356 and P0351

 

Here is a torn sparkplug boot that caused a hesitation under load, it did not cause a misfire code, only a CK ENG LT with P0351 and P0356 the fault was found by inspecting the ignition boot during a recommended tune up.