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Thread: cdti warm idle and smoke

  1. #1
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    Default cdti warm idle and smoke

    need some help on this. ! 46K 150 bhp CDTI. this car has had a lot parts replaced to try and slove a fault by the dealers. The problem is after the car has been resting for over 2 hours it starts up ruff and above ave. smoke comes out the back. I can stop this by either v lightly touching the acc pedal or un-plugging either the MAF, boost sensors to go to basic settings. Both of these sensors are new. the idle and smoke disappear within 10 secs and all seems ok.

    The car does not do this when on a cold morning start and does not smoke etc after leaving it for 8 hours just anything upto 6 hours!! It,s not the turbo or injectors as that has been done as well.

    Do the CDTI have a idle control valve or something i can try!?!??!?

    Please help, the dealers are playing around now and no faults are found...

  2. #2
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    send a email to mark gsi he may have some idea what it may be

    id start screaming at the dealer to get you a new engine just to put the wind up them to find the prob

  3. #3
    Regular Member Gsi3.2's Avatar
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    thanks for the Pm..

    i'd try either the coolant temp sensor, as it doesn't do it when it's cold, and yes it does have an idle control valve.. look back right on the engine where the intake hose enters the engine..the valve is there..

    sounds like cronic over fuelling on startup cold cycle.. they need to examine the fuelling cycle and get some breakout feeds of values out of the coolant sensor..

  4. #4
    Regular Member Ian's Avatar
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    Could very well be the fuel pressure too. Cold, a nice rich mixture is good, but when warm it smokes due to excessive fuel.

  5. #5
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    yep, and that fuel shot is regulated by the coolant temp sensor.. too cold a reading will increase the reading to the ecu making it overfuel...that will give you the black smoke overfuelling..and overfuelling will result in an uneven idle speed as the engine tries to burn excess fuel..

    the only things that effect the burn on the diesel is the amount of avaliable air and the amount of fuel to burn..
    Last edited by Gsi3.2; 21st December 2006 at 23:34.

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    told you marks the one with the spaners

    must ask mark is the slay packed

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    got my list and checked it twice..

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    hope the slay has fog lights fitted

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    Quote Originally Posted by Gsi3.2 View Post
    yep, and that fuel shot is regulated by the coolant temp sensor.. too cold a reading will increase the reading to the ecu making it overfuel...that will give you the black smoke overfuelling..and overfuelling will result in an uneven idle speed as the engine tries to burn excess fuel..

    the only things that effect the burn on the diesel is the amount of avaliable air and the amount of fuel to burn..
    thats basically what I was getting at, but there are other systems that affect the fuel pressure, for instance a partially clogged return fuel line. I would always have the fuel pressure checked as well as a full check of the sensors.

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    the coolant temp sensor has been replaced as well. On the old petrol engines there use to be a problem when a small hole got blocked up and it affected the idle does the cdti have anything like this? I have had the throttle control off today and given it a wipe around but but that looked ok, What was caked in black dry soot was the area around the EGR but i have carefully got this clear and clean but it still is the same. The question is should it smoke on a 45K engine on a mid-day startup???/

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