Idle fluctuates on Ford and trouble codes P0505 or P0506
Ford has issued a service bulletin #12-7-4 to address a P0505, P0506, Idle fluctuation problem on the vehicles listed below. The problem may exhibit P0505, P0506, with or without idle fluctuation and hard starts. In addition, the vehicles may also have P2111 and P2112 codes stored after the keep alive memory has been cleared, battery has been disconnected, or the vehicle had a dead battery.
Ford has determined that the problem is caused by carbon buildup in the electronic throttle body
The service bulletin applies to these vehicles:
2005-2008 Crown Victoria
2004-2007 Explorer, F-Super Duty
2006 F-53 Motorhome Chassis
2007 Explorer Sport Trac
2005-2008 Town Car
2006 Mark LT
2005-2008 Grand Marquis
The REPAIR involves updating the PCM with the latest calibration and cleaning the electronic throttle body. To clean the throttle body, follow these steps:
1) Remove the throttle body from the intake manifold
2) Use Motorcraft Choke and Linkage Cleaner (PM-14) to spray the throttle body plate and bore.
3) Use a soft clean solvent resistant brush to clean the edges of the throttle plate and throttle bore to remove carbon deposits.
NOTE: Do NOT spray the cleaner directly into the throttle plate pivot shaft. The cleaner can enter the motor area and cause damage.
4) Wipe clean and reinstall the throttle body
©, 2015 Rick MuscoplatPosted on by Rick Muscoplat