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Thread: 2.0DTi owners - check your vacuum pipes!

  
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    2.0DTi owners - check your vacuum pipes!

    I always suspected my car wasn't boosting quite right the odd time. Finally figured out why - the vacuum pipe to the turbo was kinked. It runs from the right hand side of the engine where the vacuum pump is, goes under the plastic engine cover, takes a sharp bend then heads to the valve and then to the actuator. It was kinked at the bend on the corner of the cam cover.

    Unkinked the bend and rerouted the pipe, and now it's definately boosting better.

    If anyone is keen, I'll take pics tomorrow of what I did.
    2007 Metro Blue 5 door Mk5 Elite 1.7CDTI
    6th Vauxhall (4th Astra) in 10 years...plus a couple of other sheds...

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    Yes please

    2003 Sapphire Black 3Dr DTi Astra
    Custom Irmscher kit, Interior Leather/Alcantara retrim & Alpine/Focal Install
    Install progress (----------)

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    tower's Avatar
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    known problem on the Dti engine models,veccys suffer as well....

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    piccy please might affect the 1.7 too i hope as im sure the boost could be better
    2012 mk5 van / 2006 sporthatch

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    Cheers, ill have a ganders later on, but it doesnt seem too bad. Can't hurt giving it a check.

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    OK, here's the before and after pics.

    Ecotec cover removed, the red star clearly marks the vacuum pipe that's kinked just at the clip - mine was kinked more that that, but I refitted it to take the photos after fixing it yesterday:


    Vacuum pipe removed from clip and gently straightened - when the Ecotec cover is replaced, it holds the pipe in that spot due to the foam underneath the cover, and the cover is on rubber bushings:


    You could, if you wanted, cable tie the pipe to the spill pipes at the front, but I didn't bother as those spill pipes can be pretty fragile at the best of times.

    Oh, and don't do this mod when the engine is hot - the top of the engine is pretty much scalding hot (I have the blister to prove it).

    To answer ADi's question, I doubt this will be a problem with the 1.7DTi as the turbo is on the front of the engine, so there shouldn't be any vacuum pipes going towards the back. The 1.7DTi is a very different engine to the 2.0 and 2.2 DTi units.
    2007 Metro Blue 5 door Mk5 Elite 1.7CDTI
    6th Vauxhall (4th Astra) in 10 years...plus a couple of other sheds...

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    Just wondering, would that pipe be a suitable point at which you could Tee in a take off for a boost guage?

    p.s. thanks for the pics.
    2003 Sapphire Black 3Dr DTi Astra
    Custom Irmscher kit, Interior Leather/Alcantara retrim & Alpine/Focal Install
    Install progress (----------)

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    No, you'd need to put a boost guage after the valve. That pipe is just a vacuum supply from the pump.

    Boost is controlled by the little valve down the back of the engine beside the turbo. It's like a little round valve with "VAC" written on the top, has two pipes coming out the top, and two on the bottom. It's sort of on the side of the inner wing, below the air feed to the turbo. I'd recon the boost guage would need to go into one of the feeds from that valve.
    2007 Metro Blue 5 door Mk5 Elite 1.7CDTI
    6th Vauxhall (4th Astra) in 10 years...plus a couple of other sheds...

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    Cheers, will have to look into this then.
    Need to find out where to "Tee" into.
    2003 Sapphire Black 3Dr DTi Astra
    Custom Irmscher kit, Interior Leather/Alcantara retrim & Alpine/Focal Install
    Install progress (----------)

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