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Thread: V6 Cdti high pressure pump failure and fix

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    Default V6 Cdti high pressure pump failure and fix

    Hi All,

    I recently went through the "obligatory" pump failure misery and thought I'd share my findings.
    My car is a 2004 and has done about 130K kms. (We have a Signum with the same engine - same problem -same fix)
    When the pump starts acting up you will hear clunking at low revs and cold starting will be difficult then later impossible. If you start to experience this you only have about 10-20K kms to go before it packs up.
    Now the good news: The pump itself never fails. What gives up is the pressure regulator valves. The tooling at the factory had something to do with this and later they changed it -> replacement parts should last a lot longer.

    Here are the Denso part#s:
    - 096710-0052 (orange cap)
    - 096710-0062 (green cap)

    Any competent mechanic will be able to change them in about 4-5 hours. You don't need to take the pump off but will have a difficult time reaching one of the screws. (might have to bend a torx wrench to reach it)
    The two valves will cost you around 200 pounds + VAT.
    Hope it will help some of you.
    BR,

    t.

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    hmmmm...so it's not just the later ones then.

    Are your cars remapped or fitted with a tuning box?

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    Hi I changed these on mine my self at 48k. Less than £100 for parts. The scew you can't get to there is an ali lug in front of it, it has no use what so ever so you can chip a bit off to get to the screw. This problem is with all model pre faclift and facelift. my VX stealer has done loads on all Y30 and Z30 . Common problem.

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    Obviously this problem is not helped by the fitting of remaps and tuning boxes!

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    I don't know as I have the problems with mine still. I fitted a tunning box and it made no difference other than pulling away easier and perforemance was better.

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    Quote Originally Posted by sb1uk View Post
    I don't know as I have the problems with mine still. I fitted a tunning box and it made no difference other than pulling away easier and perforemance was better.
    The tuning boxes increase the fuel rail pressure by boosting the pump above its normal parameters,remaps do this too.It's true of all remaps and boxes on common rail diesels.In most cases the 'consumer' becomes the 'guinea pig'.

    There are too many instances of good HP pumps going bad because of tuning.

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    Well I have a bad smell of emision on my car now. I think I have a crack somwhere in my manifolds. This might have someting to do with my missfire. Does any one know someone with a smoke tester?

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    Quote Originally Posted by sb1uk View Post
    Well I have a bad smell of emision on my car now. I think I have a crack somwhere in my manifolds. This might have someting to do with my missfire. Does any one know someone with a smoke tester?
    Err...see this thread.

    http://www.vectra-c.com/forum/showthread.php?t=36319

    Injector seals sounds favourite.

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    DTUK. Increased rail pressure WILL shorten the life of the valves but I'm prepared to take that risk for the increased oomph.

    Quote Originally Posted by diesel dog View Post
    hmmmm...so it's not just the later ones then.

    Are your cars remapped or fitted with a tuning box?

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    I had all 6 injectrors out and tested and new brass seat seals. On the V6 CDTI the injectors are inside the rocker cover so if they leaked they would leek into the oil ,no fumes will come out. I removed oil filler and no diesel smell.

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