td4 Idling problem

[tp_123]

Hi Guys and Girls,

I have an issue with my 05 freebie Td4 which has done 95000 miles.

She is rough idling at around 750rpm and is smokey (white) when cold, does not stall but is hunting.

when warmed up she runs fine, I have noticed that when I disconnect the high pressure fuel sensor she stops hunting,

I have no warning lights or codes in the OBD, but my interrogator only shows a limited live stream.

Will a dealer/independents OBD interrogator be able to distinguish between healthy or blocked injectors and or sensors if there are no fault codes from the ECU?

I have replaced all filters including fuel, and am planning on changing oil as soon as I get the chance, so far have seen no real improvement.

has anyone had a similar issue or guidance as to narrow down the problem,

I am thinking injector (expensive, is it worth getting from a scrapper and do they all need to be balanced) or fuel regulator/sensor

Thanks in advance

[defv890]

I suspect it's the rail sensor and connector pins Lr do a mod sensor and overlay loom very easy to fit but a bit pricy

[tp_123]

An update if anyone is interested.

As there are no ECU faults hooking up to a dealer OBD reader is largely pointless, as it simply monitors rail pressure and that is fine.

I decided to go low tech and threw some good old injector cleaner into a full tank and took the old girl for a blast at high revs, she is much better with less knock and smoke when cold still hunting slightly at idle when cold but nowhere near as bad as before.

I will persist with injector cleaner additive for a few more tanks and that should clear up the injectors and prevent spill back.