Hello Rancid - it's good to know mine isn't the only one that does it, thanks for that.
I'm just really puzzled not only that this hunting is new behaviour so something has changed to introduce it, but by the fact I'm fairly sure it did a regen yesterday morning before it had warmed up - as far as I knew they weren't supposed to do that...
Oh well, we all know Alfas can be a law unto themselves sometimes, perhaps this is one of those moments
I'm going to go back to the regular Shell diesel / Millers additive combo I used to use for a bit and see if it calms down.
Reviving an old thread here, but hoping you can help. I have an almost exact issue with my 159 2.0 Jtdm. Did you ever get to the root cause of your issues ? Or can anyone else shed any light ?
I get an intermittent hesitation on light throttle that occurs for a period before going away for a while and then returning. Truly intermittent and im thinking it could be during a DPF regen. When the problem occurs if i pull over i get a very lumpy idle which has caused it to stall. During driving i get the hesitation only on light throttle and some exhaust soot plumes. Ive check all vacuum lines, all MAF, MAP, throttle valve and EGR are clean. My EGR is actually coded to remain closed, and logging on AlfaOBD confirms this. Although, will the EGR still operate during a DPF regen ? I only ever use Shell fuel, with miller additive recently, but the issue occurred before then.
Im also suspecting a fueling issue, as changing the fuel filter a while back seemed to cure the issue, but only for a month or so, then it returned. But the new filter cant be blocked already.
One very interesting thing, when the issue occurs with light throttle whilst cruising, i can hear what sounds like a metallic valve opening/closing abruptly. Now i cant get it to do this whilst stationary to see where the noise is coming from.
Its all a mind tease. urgh.
Appreciate any other insights people can add.