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Tech Tip: 2005-06 Ford Escape/Mercury Mariner ECM Problem


2/24/2011

Vehicle owners may experience misfire and poor engine performance. Fault codes may be set for coil-on-plug (COP) or Powertrain Control Module (PCM). No change in performance after replacing components or repeated failure of replacement components.
 
Application:
78-1044F for 2005-2006 Ford Escape and Mercury Mariner 2WD 3.0L

Problem:
Misfire, poor engine performance. Setting fault codes for coil-on-plug (COP) or Powertrain Control Module (PCM). No change in performance after replacing components or repeated failure of replacement components.

Cause:
Incorrect spark plugs may cause damage to the COP(s) and PCM.

Solution:
Ford TSB 09-2-6 refers to COP and PCM damage due to the installation of incorrect spark plugs. The wrong plugs generate excessive RF interference, resulting in damage to the PCM and COP(s). Unless these spark plugs are upgraded, the failure of perfectly good replacement components will continue. The TSB involves checking for the presence of a date code (example shown in Figure 1). If no date code of any kind is present, the plugs must be replaced. Also, depending on how many COP codes are set, it may be necessary to replace one or more COP(s) and the ECM. Please refer to the TSB and the vehicle service manual for complete detailed instructions.

Note:
This ProTech bulletin is supplied as technical information only and is not an authorization for repair.

Tech Tip courtesy of CARDONE Industries, Inc.
  Previous Comments
avatar   Ted Thompson   star   2/25/2011   7:00 PM

Gerald, your caps lock is stuck on.



avatar   isletek   star   2/25/2011   12:00 AM

I guess Mazda didn't get in on this for their 3.0 AJ engine in the Tribute(Escape)..or is maybe because they used Denso plugs not Motorcraft?



avatar   GERALD GILLIS   star   2/24/2011   3:36 PM

THIS IS A GREAT ARTICAL HOWEVER WE HAVE CHANGING PLUGS AND COILS ON THESE CARS FOR AWHILE NOW AND ITS USUALLY AFTER THE VEHICLE HAS OVER 90000 MILES ON THE THAT WE GET A CYL MISFIRE WE ALWAYS RECOMMEND CHANGING THE PLUGS WITH OEM STYLE PLUGS (SINGLE PLATIUM)AND RECOMMEND THE COILS ON AT LEAST THE THREE IN THE BACK BEING PLENUM HAS TO BE REMOVED AND ON THE FRONTS WE SUGGEST AT LEAST COIL BOOTS IF THEY CANT AFFORD THE COILS THAT WAY IF THE COILS FAIL ON THE FRONT THERE EASY TO SERVICE BUT WAS UNAWARE OF THE DATE CODE PROBLEM I HOPE THE REPLACEMENT PLUGS ARE NOT A ISSUE BEING I DIDNT SEE A DATE CODE ON THE REPLACEMENT PLUGS

















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