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Thread: V6 CDTI sometimes hard to start

  1. #1
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

    Default V6 CDTI sometimes hard to start

    My V6 has developed funny symptoms lately. It sometimes takes a while to start from cold What baffles me is that it can also happen, although not as bad, when the engine temperature is around the 80°C mark

    Overall performance is good, mpg is good, but it does smoke quite a lot (grey and black). It sometimes judders under acceleration below 2000rpm but not much. It's had a service 2 months ago and only done 6k miles since.

    The spanner light comes on, but only shows a cruise control fault. Never been in limp mode.

  2. #2
    Regular Member mattv6diesel's Avatar
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    Vehicle : Bmw 330d

    Trim : Msport

    Engine : 3.0d

    Year : 2008

    Default

    maybe the suction part isn't working properly. the part instead of the pump in the fuel tank. might be best getting a dealer to look so they can see the fuel pressure on cranking

  3. #3
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

    Default

    So you think I have a weak low pressure fuel pump?

  4. #4
    Regular Member m8internet's Avatar
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    Just to confirm
    The engine suffers VERY poor starting on cold, but is fine when warm or hot?

    When warm and idle, the exhaust gas is clear
    When you rev the engine (as you would do for an emission test) how much BLACK smoke is produced?
    Once the engine has returned back to idle, is the exhaust gas still clear?

    Under heavy load / high revs does the exhaust produce smoke?
    On changing gear does the exhaust produce smoke?
    [For the above it might be best to get someone to drive behind and take a video, and you can then check]

  5. #5
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

    Default

    Quote Originally Posted by m8internet View Post
    Just to confirm
    The engine suffers VERY poor starting on cold, but is fine when warm or hot?

    When warm and idle, the exhaust gas is clear
    When you rev the engine (as you would do for an emission test) how much BLACK smoke is produced?
    Once the engine has returned back to idle, is the exhaust gas still clear?

    Under heavy load / high revs does the exhaust produce smoke?
    On changing gear does the exhaust produce smoke?
    [For the above it might be best to get someone to drive behind and take a video, and you can then check]
    -The engine only sometimes suffers poor starting on cold and is usually fine when warm or hot
    -when warm and idle, there is no visible smoke from the exhaust (ie. clear fumes)
    -When I rev the engine there is quite a lot of black smoke, but only after the first boost. It's fine (no smoke) if after booting it I hold the revs at 4000
    -Exhaust still clear when back to idle
    -Under heavy load there is some grey smoke which is barely noticable (+black if I've driven slow for a while)
    -On changing gear there is no smoke coming out of the back, only when I floor it, it puffs out greyish and a bit black smoke


    Clear enough?

  6. #6
    Regular Member m8internet's Avatar
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    What is the current mileage, and date and mileage of last service

    How old are the glowplugs, date and mileage last changed?
    How old is the camshaft sensor, date and mileage last changed?
    Have the injector nozzles been replaced, if so were the new, used, or refurbs?

    The black smoke may be due to too much fuel being fed to the fuel pump
    The grey smoke suggests there is something other than diesel in the fuel tank
    Last edited by m8internet; 3rd June 2010 at 09:42.

  7. #7
    Full Member Big Sig's Avatar
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    Quote Originally Posted by Celes View Post
    -The engine only sometimes suffers poor starting on cold and is usually fine when warm or hot
    -when warm and idle, there is no visible smoke from the exhaust (ie. clear fumes)
    -When I rev the engine there is quite a lot of black smoke, but only after the first boost. It's fine (no smoke) if after booting it I hold the revs at 4000
    -Exhaust still clear when back to idle
    -Under heavy load there is some grey smoke which is barely noticable (+black if I've driven slow for a while)
    -On changing gear there is no smoke coming out of the back, only when I floor it, it puffs out greyish and a bit black smoke


    Clear enough?
    Thats exactly like mine was - although I never had a starting problem. If you rev it you will get some black smoke as it struggles to burn all the fuel correctly.
    Now I need a turbo to keep up!

  8. #8
    Regular Member Penfold101's Avatar
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    I can confirm he puts out smoke under acceleration. He wasn't impressed when he saw that mine didn't...

  9. #9
    Regular Member m8internet's Avatar
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    Quote Originally Posted by Big Sig View Post
    If you rev it you will get some black smoke as it struggles to burn all the fuel correctly
    The black smoke is due to the lack of pressure release valve on the EGR
    As a result the valve to the EGR stays open on a rapid increase in revs

    Most other engine manufacturers get round this by having a longer pipe between the turbo and EGR
    However, this results in greater heat and the pipe often fails
    Personally, I would rather not have the pipe as Isuzu have done with the extra black smoke

  10. #10
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

    Default

    Quote Originally Posted by m8internet View Post
    What is the current mileage, and date and mileage of last service

    How old are the glowplugs, date and mileage last changed?
    How old is the camshaft sensor, date and mileage last changed?
    Have the injector nozzles been replaced, if so were the new, used, or refurbs?

    The black smoke may be due to too much fuel being fed to the fuel pump
    The grey smoke suggests there is something other than diesel in the fuel tank
    -Actual mileage is unknown, the clock shows 107.5k miles, OP-COM says 123k. Last service (oil, oil filter, air filter, fuel filter) was done on the 22nd of March at exactly 102k miles (clocks). The engine does not use oil or coolant.

    -From what I know, but I didn't check further, the glowplugs might be still original from 2003 when the car was made. Bad glowplugs wouldn't cause poor starting at more then 20°C and when the engine is warm. No fault codes for glow plugs or glow plug relay.
    -Camshaft sensor as above. No fault codes for it either.
    -Injectors are still original. The engine sometimes makes a ticking noise when going up hill in a high gear on low revs. My old 3.0 used to do it but it was a lot more dramatic and loud. That was cured when I replaced all 6 injectors, yet it still sometimes puffed out a bit of greyish smoke. It never had starting problems like my current V6.

    On my last V6 I replaced: EGR, Injectors, SCVs, Turbo....AND IT STILL SMOKED WHEN REVING THE ENGINE HARD It never ran as good as my current 3.0

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