Car Mechanics (UK)


- Ford Motor Company · Belgium · Belarus · Austria · CyanogenMod · Ford Mondeo

In­stead of the en­gine man­age­ment sys­tem pro­vid­ing a series of post-in­jec­tions which per­mit diesel to en­ter the ex­haust and com­bust the soot, var­i­ous Ford mod­els em­ploy a fuel va­por­iser in­stead, bolted to the ex­haust sys­tem. A glow-plug is built within the unit to va­por­ise the fuel, prior to it be­ing in­jected into the ex­haust gas stream ahead of the diesel ox­i­da­tion catalyst. This raises the DPF tem­per­a­ture suf­fi­ciently to com­bust the soot.

Faults will cause the en­gine man­age­ment light to il­lu­mi­nate, which might be ac­com­pa­nied by the ve­hi­cle go­ing into ‘limp-home’ mode. Un­less a blown fuse, tired fuel pump or glow plug re­lay is at fault, the va­por­iser is the likely cause. Soot can clog the out­let noz­zle and is a common is­sue. Over­heat­ing tends to re­sult from in­suf­fi­cient fuel reach­ing the va­por­iser. If the glow plug fails, the fuel will not be va­por­ised and this causes black smoke to be emit­ted from the ex­haust.

You can test this using a mul­ti­me­ter. Should you mea­sure fewer than 0.8 ohms, or more than 1.3 ohms, the glow plug is no longer ser­vice­able. As the va­por­iser can be nei­ther cleaned, nor dis­man­tled, re­place­ment is the only op­tion.

ELTA Au­to­mo­tive told CM that Ford’s Mon­deo is par­tic­u­larly prone to fuel va­por­iser faults, with the most common fault codes en­coun­tered be­ing ‘P246B-00: Ve­hi­cle Con­di­tions In­cor­rect for Diesel Par­tic­u­late Fil­ter Re­gen­er­a­tion’, ‘P2463-00: Diesel Par­tic­u­late Fil­ter – Soot Ac­cu­mu­la­tion’ and ‘P24A4-00: Diesel Par­tic­u­late Fil­ter Re­stric­tion – Soot Ac­cu­mu­la­tion Too High’.

After the fault has been found, which is likely to in­clude re­plac­ing the va­por­iser, clear the fault codes and run the ve­hi­cle in con­di­tions that in­duce a DPF re­gen­er­a­tion.

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