wow!! I'm over the moon , My cdti 150 has had this git of problem for aaaaaages, uneven running,chugging/blue smoke on start up, along with it making my dmf sound really kn**kered & embarrassingly noisy, So i've been trying everything & i mean everything, most will know there's no fault code's stored but you cant put a finger on it, fuel cleaner, different garages,double-double checking glow plugs,removing EVERY electrical connector in sight & spraying with elec contact spray,cleaning egr, boost sensor,throttle body (including any known 'how 2' for these components, tapping ,banging, swearing, cursing & even threatening it ''that's it your going you heap of ****'', None of these even came close to making a difference until!, Last Saturday morning i started it & for f**k sake not something else! (car/spanner light) on, So key off/on & i was away, When on return opcom shows p0190 rail pressure range/performance (07) not present, Well that was it this sounded as though it could be expensive, I couldn't find anything so left it, Same again Sunday & Monday all were on first start up of the day/night, After some brain swelling thoughts i removed the right hand common rail sensor (pic included), leaving the engine to cool or do after some time standing with plenty of rags to catch diesel i used a 27mm ring spanner there was no pressure in the rail as sutch when removing the sensor (looks just like a big nut/bung with a small hole in the end when removed, I put this in an old plastic jug & poured a couple of inches of brake cleaner in & swilled it around & generally gave it a clean, Put it back in (there's no seals) & after a couple of 15 sec cranks she fired up, ( no fault light came up but it did store a code which i cleared after, probably due to low pressure) & Hey presto!! no chugging, no blue smoke & i presume the slight chugging must have been upsetting balance cos my dmf don't rattle any more on tick-over!!! at all, It did before all the time whether hot or cold RESULT!!!!!!!!. , Its been the second day with two 24hr overnight stands & ive had no codes pop up on start up & none of my other symptoms.(sensor is to the left of its plug arrowed here).
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