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Thread: Astra H 1.9 CDTI 150 - sudden turbo lag - no fault lights

  
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    Peter Fairbairn's Avatar
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    Astra H 1.9 CDTI 150 - sudden turbo lag - no fault lights

    Hello AOC forum users

    My car is an Astra H 1.9 CDTI SRi 150 - 3 door, 2007, 60k. I am second owner from new, FSH, maintained well.

    I have had the car since April 2010 and, apart from the alternator failing last year, I've had not a single issue with it and have always loved driving it.

    Today however, I have noticed that it seems to have very little power at low revs, and the experience of pulling away from junctions/roundabouts is not as "snappy" as it was yesterday... and indeed as it has been for the last few years.

    I have always observed that the turbo engaged at 1500 revs and continued to boost till about 3000 RPM.

    Now, it seems to engage at about 2250 revs and there is a very noticeable lag.

    When the turbo spools up the power feels the same as before, it just takes longer to get to the boost.

    It's not so noticeable at main-road speeds, but certainly is in town.

    So... what could this be?

    Please accept my apologies if there are many threads like this. If I have not looked hard enough then please direct me there instead of directing time and energy toward answering this.



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    Clarky22's Avatar
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    Hi
    Could be your EGR valve as they are prone to clogging up, check out the threads on the forum . There is a how to do it somewhere.

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    Bolter99's Avatar
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    Check your swirl flap arm is still connected to the swirl flaps. Also, check the vaccum solenoid normally located on the back of the passenger headlight or near it.

    Looks like a black cylinder with 2-3 plastic tubes going to it.
    Drives: Astra 1.9 CDTi 150 XP 5 Door (The DisAstra - Family Planning Edition)

    "I have not failed. I've just found 10,000 ways that won't work." ~ Edison

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    MARK@CMBAUTOS's Avatar
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    I had the same fault with my 13 cdti last week it went from lag to no boost in a few weeks also no codes present
    It was a burst Vacume hose to the boost/vacume solenoid that caused replaced it and iv never felt it boost as early

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    Peter Fairbairn's Avatar
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    Thank you for your replies.

    I have fixed it myself after much reading and self-reassuring.

    It was the EGR. It was COMPLETELY caked in black soot. Eventually I got it sparkling with a toothbrush, some old T shirts and a £7 can of carb cleaner from Halfords.

    I also cleaned the manifold section, and the boost sensor.




    I had forgotten how fast that car can move.

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