159 misfire like stutter on acceleration - Alfa Romeo Forum
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Alfa 159 1.9jtdm

159 misfire like stutter on acceleration

My 1.9 jtd has developed a sporadic stuttering or hesitation when passing through 2.5 - 3k revs. Bizarrely, it only occurs under light acceleration (which is typically, most of the time for me) - if you give it more beans, it doesn't seem to happen.

On one occasion, after traversing busy traffic on a saturday afternoon, it got pretty bad as if one injector wasn't firing - a regular and very noticeable on/off power during acceleration through the same rev range. More commonly, it manifests as a hesitation and failure to pick up well - trying to write this I realise how hard it is to describe.

It's going into the dealers in the next couple of weeks as I have some warranty remaining so mostly curious at this stage - and really want reassurance it's not something potentially more serious that should be looked at now. I suppose my question is whether this is related to the EGR or something similar? I've been regularly using V-power diesel (about 1500 miles now) and have given it a proper hard run through the gears to try and clear things?

Aside from this, the car runs perfectly well... Anyone experienced similar and if so, what was the diagnosis?
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I have the same issue along with a rough idle and occasional reluctance to start, with excess smoke on start. Diagnostics show this as number 1 & 5 injectors out of range and hence resulting in over fuelling . So she's booked in the dealers to have this work done next week under warranty.

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Mine had a similar symptom, which eventually led to complete loss of power when accelerating on a slip road!

I had the EGR valve replaced and it's worked fine ever since.
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159 , acceleration , misfire , stutter

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