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Thread: strange noise from engine cdti 150

  1. #1
    Regular Member kamar's Avatar
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    Default strange noise from engine cdti 150

    hi guys i just noticed that when i start my car colt in the morning it sounds asif its on 3 cylinders i can hear a thumping or knocking sort of sound approx every 15 secs. also if i rev the car even to the slighest theres a clicking sound again from engine loud enough to notice, these are only happening on cold start in morning only rest of day its fine, theres no struggle on start, not a tiny bit of smoke no loss of power no oil smell or strange turbo sounds.... any ideas suggestions iyl appreciate... i cant even really show 2 a mechanic coz by the time i get 2 my nearest garage 5mins drive all the noises have gone....

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    Regular Member John35's Avatar
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    Try doing a search for a knackered preheater could be that.

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    hello kamar , to be honest mate the cdti unit is a tad on the noisey side any how, if it goes once its warmed up i would'nt worry to much..

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    Regular Member kamar's Avatar
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    Thanks guys appreviated it doesnts worry me i just thought iyl see if any1 has experienced it again thanmks for info

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    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP NAV

    Engine : 1.9 CDTi 150

    Year : 2007

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    Sounds like something VauxManG had with his dads CDTi, maybe he'll be along later and comment...

  6. #6
    Regular Member Vaux-Man-G's Avatar
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    Hello, im around. The issue I had with my dad's CDTI was a lumpy start when cold. The used almost shudder and shiver but never had that clicking sound. This was on cold start up's too.

    TBH, I dont know what eventually cleared up the problem as I did loads of things, but when its cold, it still does wobble a tiny bit, but not as much.

    But yes Kamar, your right, this used to sound as though it was running on 3 cylinders too, like a misfire.

    Things I have done since:
    - 3rd Injector Wiring mod;
    - Took off the replacement EGr and re-fitted original;
    - Used 10k Boost fromt halfords and run that through.

    Combintion of things have contributed to an improvement, but im at a loss as to what the clicking is mate.

  7. #7
    Regular Member HappyHarry's Avatar
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    I've ben plagued with this almost from the word go with mine. The stealers gave me the usual 'they all do that sir' when it was under warranty, but when it was out they started suggesting all sorts such as duff injectors (£750 to swap all four) and a sticking valve, (£800 quid bill just to take off the head).
    I am also convinced it is mechanical as I have had some success in clearing it....

    I changed the oil, flushed it, and refilled with Castrol edge 10/30 synth. I also added some of that Wynns additive which supposedly cleans valves and lubricates lifters. Initialy I thought I'd wasted £50. BUT after about 2k, things are a lot, lot better. I still get a small shudder when cold- nothing like before though -and the whole engine seems more refined. It's worth a go.

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    Regular Member kamar's Avatar
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    cheers guys like i said no starting problem nothing odd and it only makes the knock sound when temp below 2 degrees otherwise fine its got a tiny shrudder but no miss... no loss of power... im gonna try 10k boost and clean injectors etc ive done 3rd injector.... but its only noticible to me as i drive it no1 else notices.... the clicking sound it will only do when i rev it as the revs drop it will make the sound but doesent sound serious as its still perfect.....

  9. #9
    Regular Member kamar's Avatar
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    maybe it needs a service as ive just checked and it needed another service 4k miles ago. no lights on dash and never gone in limp mode touch wood....

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    kamar is your car mapped or do you run a tuning box ?

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