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Thread: CDTI Engine wont start

  1. #1
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    Default CDTI Engine wont start

    Evenin' all,

    I've got a problem and I could do with some help.

    I've just clean the EGR valve and boost sensor on my 150 CDTI. Both were really gunked up with carbon, as was the inlet manifold where the EGR valve sits. I used carb cleaner on the valve and boost sensor and scrapped the inlet manifold out whist hoovering out the loose pieces of carbon.

    When I came to start the car it started but ran really lumpy for few seconds then cut out. It now wont start at all and when it turns over its sound really odd, almost as though the cambelt has gone, I've checked the belt and it is OK.

    I've checked the EGR valve with 12 volts across the pins and I can hear the solenoid clicking so that appears to be OK. That leaves the boost sensor, I've tried to dry it out incase any carb cleaner had found its way inside but that didn't make any difference.

    Is it possible to damage the boost sensor by cleaning it and if so would it stop the engine from starting? Any help would be appreciated.

    Dag.

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    Full Member Vaux-Man-G's Avatar
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    Default

    Hi Dag,

    Cant really offer much help, but I did my dad's today and when it started, it started very very lumpy indeed and got me worried.

    I then kept on revving it with foot to the floor and red lining, eventually, it spat out loads of black smoke and ran fine from then on.

    I hope its the same tomorrow or im in the poo!

    If it starts, floor it with rev's and see what happens.....but wait until someone else posts in case there is a simpler explanation.

    Good luck.


    Bye bye Vec B
    - Hello Siggy!

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    Full Member GazVXLINE170's Avatar
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    Default

    Dag happend to me m8 - have you tightened up the screws ESPECIALLY the 13mm ones on top of the valve?

    Gazza4
    Insignia VX-Line Nav CDTI 170.

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    Default

    any big lumps of soot didnt drop into the inlet manifold did it? Heard a few stories about car hard to start after a EGR clean, but all eventually started, I can only put this down to lumps of soot fallen into the manifold and is trying to combust them?
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    Default

    Thanks all for the answers,

    I made sure all the screws were tightened and I tried to make sure that I got all the soot but there must have been some that got away. As well as the none starting it's the way that it's turning over that's getting me worried, almost as though all the fuel supply has been cut, that's why I'm wondering about the boost sensor.

    I've got the parts off again, I'll get another set of gaskets and new O ring tomorrow and see if that makes any difference.

    If it starts I'll make sure it gets a big boot of throttle.

    Dag

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    Regular Member byebyeitsagsi's Avatar
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    Default

    Dont be scared to give it a few turns of the ignition to get a good heat into the glow plugs and also dont be scared to let it turn over 10 seconds at a time and i may just fire up and as the guys said above give it some welly when it does start HTH.

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    South Wales Assistant Regional Organiser davidjameswest's Avatar
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    Default

    where is the boost sensor located on the 150 bhp cdti

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    Regular Member Pete B's Avatar
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    Hi Dag

    Can't really help either, I did exactly the same as you yesterday with EGR clean, scraping/hoovering fine carbon from manifold & cleaning the boost sensor but had no problems at all starting afterwards.

    However, a few weeks ago after doing an oil change, for some reason it took ages (well about 10 secs) to start at all and then required some throttle to keep it going but once going, all OK since. I never did know why, it was as if the fuel had to be bled back through but I hadn't touched any fuel pipes!

    Points I would check though, as others have said, make sure the round gasket to the pipe held by the 13 mm bolts is properly seated and that the flange is properly clamped up. I was extra careful here as I could see the potential for easliy misplacing the gasket or even not getting the flange clamped up properly. I assume if there was an air leak here there may be quite a problem.
    Last edited by Pete B; 28th June 2009 at 23:21.

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    Default

    Quote Originally Posted by davidjameswest View Post
    where is the boost sensor located on the 150 bhp cdti
    If you locate the egr valve then move along to the left - assuming you are standing infront of the car - about 8 inches along you will see a black plastic component with a blue sticker on it marked GM - this is the boost sensor m8 .

    Gazza4
    Insignia VX-Line Nav CDTI 170.

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    South Wales Assistant Regional Organiser davidjameswest's Avatar
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    Default

    any pics you guys have of the egr and boost sensor, also have you guys noticed a diff buy cleaning the boost sensor ect, my egr valve was cleaned by dealer as egr valves were on back order

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