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XC90 What's this Diesel Engine Noise

Does anyone know what this noise might be have changed injectors and made no difference.

Any help would be appreciated.

Regrds Bob


  • GhettobirdJulian @Ghettobird Melbourne - SE Suburbs

    Thats a misfire for Robert, to go much further than that you'd need some special equipment and a scan tool to see whats going on unfortunately.

    If youve changed injectors then the replacements will need to be coded to the car. otherwise it could be a plethora of things from a lazy fuel pump not supplying enough base pressure to the high pressure injection pump, to a broken rocker or even a dropped valve!

    The D5s can be a fickle beast, specialist knowledge is required.

  • I must ask why did you changed injectors? was it running poorly or blowing smoke, I do lots of diesel's and playing the noise is not very clear on my p.c.

    Does the noise change when in gear or under acceleration?, if you can hover over engine with phone running so we get a better indication of it. cheers steve

  • 100% with what Julian says. If it had a misfire before you touched it then you need to start with a compression test.

  • It could be a collapsed lifter which in turn throws the rocker arm off to the side after close listening to it,

    if you take the top off it is easy to see.

  • Thanks for the replies fist off I had the injectors tested 2 were completey stuffed and 3 needed replacing. If you listen to the sound on a stereo that has a bit of bass you would hear the deep chuffing sound from the air box. The car is unregistered so I can't drive it. There was a small amount of white smoke coming out of the exhaust the mechanic thought the dpf was blocked so he did a regen and it seemed to run a bit better. He put the scan tool on it and the codes were as follows

    6664 glow relay control faulty signal

    6665 glow relay control faulty sensor

    5660 oil level sensor faulty signal

    3553 misfire cylinder 5 emission agitation

    28E0 heated oxygen sensor (HO2S) faulty signal

    2B10 particulate filter tempature sensor faulty signal

    2810 heated oxygen sensor (HO2S)faulty signal

    He is going to try a compression test and see what happens, I don't have the equipment to do these tests so will see what happens

    Regards Bob

  • Maybe take it to an independant Volvo specialist these injectors rarely fail and if inexperienced with these models then he is going to waste more of your money throwing parts at it. As mentioned by @Ghettobird the injectors need to be programmed once replaced.

    Based on those fault codes he is using a generic scan tool

  • Hi All,

    Mechanic had a death in the family so won't do anything to car for a couple of weeks is going to take the top off will let you know what he finds when he does.

    Regards Bob

  • GhettobirdJulian @Ghettobird Melbourne - SE Suburbs

    Hopefully its not something nasty

  • Ex850RSnoopy @Ex850R Somewhere Over the Rainbow. Melbourne.

    Before you go to that expense, put it on a car transport to a Volvo independent shop to get the codes read by a Volvo scan tool. And, have the injectors programmed.

    As your guy doesn't have a Volvo scan tool he can tell you nothing and you just can't replace injectors without programming them,usually done at a dealer. This was explained above.

    No matter how good your guy is or how much you trust him, a specialist Volvo shop can tell you very quickly what is wrong.

  • Hi,

    Well finally had a look at the engine turns out to be the lifter problem on 2 cylinders

    so it looks like some new lifters

    Regards Bob

  • GhettobirdJulian @Ghettobird Melbourne - SE Suburbs

    Pray that none of the valves have dropped

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