Caddy Injectors?

Discussion in 'General Diesel Discussion' started by Vdubcaddy, May 7, 2017.

  1. Vdubcaddy

    Vdubcaddy Member

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    So I'm contemplating embarking on my first injector investigation job on my caddy.
    I have what I think is an injector seal issue, tapping/clicking on acceleration?
    Having read and researched, it seems pretty straightforward? What do you folks do about cleaning the bore? Do we reseat with appropriate tool or just wet and dry? Or not bother at all and rely on new seals?
     
  2. Seatman

    Seatman Well-Known Member

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    Are we talking older tdi engine with the big pump up front?

    If so I use a brush tool on the dremmel to clean the bore out.

    If it's a seal it makes a pfft pfft noise, if it's knocking you might have an injector dumping.
     
  3. Vdubcaddy

    Vdubcaddy Member

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    It's a 2004 1.9.

    Dumping?
     
  4. Seatman

    Seatman Well-Known Member

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    Yeh, on the older tdi with mechanical injectors sometimes with wear or dirt etc the injectors might not spray properly and instead just dump the fuel in like a blob.
     
  5. Vdubcaddy

    Vdubcaddy Member

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    Ah ok, I'm not familiar with the terminology!

    I'm planning on soaking the injectors in diesel purge to clean them up, is there any way to test them when on the bench? I've seen vids that show connecting injectors to a battery via a switch and using a spray can of cleaner connected as the fuel, just didn't know if this is possible with the tdi injectors?
     
  6. Vwman2015

    Vwman2015 Member

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    There is no way of bench
    testing the old style pd injectors


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  7. Vdubcaddy

    Vdubcaddy Member

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    As I thought.
    Thanks.
     
  8. Vwman2015

    Vwman2015 Member

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    How does it run other than the noise?

    Fuel mpg ok?

    Smoke out exhaust?


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  9. Vdubcaddy

    Vdubcaddy Member

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    Runs well, a little smoke from rail, occasionally lags on uptake. Get 600 per tank.
     
  10. Vwman2015

    Vwman2015 Member

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    Mpg is good then, if you suspect something is wrong try some vcds data.

    If you think it's injector seals leak then take a look with the engine running.
    Replacing the seals you should really use an injector line up tool for re-install.


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  11. Vdubcaddy

    Vdubcaddy Member

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    Are you saying run the engine with rocker cover off and visually look for leak?
     
  12. Vwman2015

    Vwman2015 Member

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    Yea, if you have a leak your see the fumes or hear it better.

    You will have to give the injectors area a clean first so you get some oil out the way, also while your at that you may as well take a look at the cam lobes for wear as these are what drive the injector pumps and can sometimes wear if the oil changes have not done or the wrong oil has been used.

    Keep your fingers out the way though when the engine is turning !


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  13. Vdubcaddy

    Vdubcaddy Member

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    I was going to give the cam a once over to look for wear, is there any way of checking the lifters whilst the covers off? Either with engine running or not, I'm guessing I'll hear if any one is significantly worn..
     
  14. Vwman2015

    Vwman2015 Member

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    Yes you will see wear on top of the lifters, you may have to make sure there wiped clean,
    Just hand crank the engine on the crank bolt or quickly crank if over by the key, that way the lobes moves of the lifters so you can inspect the one you want.

    To be fair if your cars running fine I doubt the injector seal or lifters are worn, but if puts your mind at rest I guess there is no harm in checking.

    Also if the injector seals are leaking then the oil may smell of fuel and be contaminated.

    Going back to one of your first posts, you mentioned smoke from the engine area... is this exhaust fumes?
    Perhaps try checking the exhaust manifold for a leak and the gasket of the manifold.

    Is the eml on at all?


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  15. Vdubcaddy

    Vdubcaddy Member

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    Sorry you've lost me on the previous post and smoke? Maybe confused me with someone else?

    If not the injector seal then what else would cause the clicking sound on acceleration? Given it's a different sound to tapping of lifters?
     
  16. Vwman2015

    Vwman2015 Member

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    " a little smoke from rail"


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  17. Vdubcaddy

    Vdubcaddy Member

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    Sorry my bad!

    Should read tail not rail
     
  18. Vwman2015

    Vwman2015 Member

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    It's very hard to say from here, maybe a video with good sound? That way me and others can try and help more.

    Have you got an engine light on?


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  19. Vwman2015

    Vwman2015 Member

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    Lol ok no worries


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  20. Vdubcaddy

    Vdubcaddy Member

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    Ok so an update now van is running again!

    Looking at measuring block 13 on scanner it's showing injector values between -0.5 & 0.5, which I understand to be good readings? Now with these readings can I still have a bad injector seal?
    I have a torsion value of 2.5KW is this good?
     

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