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Alfa 159 1.9 diesel EGR valve

  • 10-01-2020 10:55am
    #1
    two wheels good
    Registered Users, Registered Users 2 Posts: 1,996 ✭✭✭


    Hello
    Alfa 159 1.9 diesel 189k kms EGR valve

    A friend was complaining of intermittent loss of power below 3000rpm in his Alfa so I offered to clean the EGR valve. (Very easy to access on this model)
    Coated in soot but not clogged. Valve was bit sticky, solenoid pin moving freely. A previous owner had fitted a restrictor plate.

    What concerns me is the end of the solenoid was drilled - I assume the plunger was seized at some point and this was to free it.

    My questions are:
    How can I test that the solenoid is working correctly? Apart from attaching a 12v supply to it which isn’t feasible at the moment.
    Is the operation of the valve detectable when driving - e.g different engine note, seeing the indicated mpg plummet?
    What determines when the egr valve opens? How often does it operate?

    I’m not familiar with diesels. I suppose if the solenoid had failed a blanking plate would have been installed not a restrictor.
    Thanks


Comments

  • #2
    Whocare
    Registered Users, Registered Users 2 Posts: 1,218 ✭✭✭Whocare


    Do you know it a egr problem ? If it probably be easier to get a second hand one ebay ect


  • #3
    two wheels good
    Registered Users, Registered Users 2 Posts: 1,996 ✭✭✭two wheels good


    Whocare wrote: »
    Do you know it a egr problem ? If it probably be easier to get a second hand one ebay ect

    No, but symptoms point to EGR according to online info - and the car had been idle and doing short trips in recent months.

    Further research tells me EGR operates continually at low revs. It’s a bit clearer to me now. I think I was confusing that SCR regeneration malarkey with EGR operation.
    I’ll wait to see what the driver reports after some driving.

    I’ll give the MAF a clean too once I get some spare clips but for now I’ve done my good deed.


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