Engine knock 2009 Isuzu Deq 2.5





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  1. #1
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    Default Engine knock 2009 Isuzu Deq 2.5

    240 000km's bad knock when cold or hot for the last 10 000km's. After 1800rpm clutter goes away completel. As soon as turbo spools up clutter goes away. (Injectors, crank sensors, suction control valve). Anybody experienced this?

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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    You have been driving it like this for the last 10 000km's?

    Any power loss or warning lights on the dash?

    Depending on the severity of the clutter sound, this could be your EGR that is stuck.
    Isuzu KB300 Dteq 4x4 - KB5

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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    The same on our KB 250 Dteq 2008. Problem was 2 x faulty injectors.
    Everything is back to normal now after the injector replacement.




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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    Any sump compression?
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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    Quote Originally Posted by werner grobler View Post
    240 000km's bad knock when cold or hot for the last 10 000km's. After 1800rpm clutter goes away completel. As soon as turbo spools up clutter goes away. (Injectors, crank sensors, suction control valve). Anybody experienced this?
    Had this for the last few years on cold winter mornings only.Disappears after a kilometre or so.300 000 kms on clock.

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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    No power loss, no warning lights, no sump compression, no smoke. Same fuel consumption. Knock when hot as well. Thanks for all the replies. Will look into injectors.

  7. #7
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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    I had the same loud knock especially when cold and thought it was normal. This was recently resolved when I had to install a new suction control valve on the diesel pump. It now drives like a different vehicle and the loud knock is gone

  8. #8
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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    Some feedback - after injectors were replaced the bakkie is perfect again. Thanks for all the advise.

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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    What was the price for injectors?

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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    How do you hear a knock in an Izusu engine? To me is sounds like they knock all the time.

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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    Quote Originally Posted by GarethHAllen View Post
    How do you hear a knock in an Izusu engine? To me is sounds like they knock all the time.
    A knock over an existing knock is a really hard knock!


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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    Bosch Electric Bloemfontein refurbished the injectors @R2500 ea.

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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    Does anyone know where to buy a new SCV Suction control valve except from the agents at a reasonable price. I have been experiencing this knock as well as uneven idling and recently more frequent stalling at slowing down or stops. So I believe its time for the scv to be replaced, took mine out and can't see anything wrong with it. Not sticky or anything but all the symptoms point to it. Does anyobe know how to test if it is functioning properly.
    Isuzu KB 250 4x4 D-teq OME suspension

  14. #14
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    Default Engine knock 2009 Isuzu Deq 2.5

    Bought one at GM for R2600 a few weeks ago. List price is more but ask for discount. The price at Bulk Source is about the same.

    My engine knock is better but I still have to get the injectors checked
    Last edited by hend; 2017/05/26 at 07:28 AM.

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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    Thanks got a scv today could have paid less if I could wait but my scv packed up finally after "ignoring" it for a loooong time. I now have a limp mode I think, my 250 does not rev past 2000rpm even though she starts great and idles perfect. How do I reset the engine check light which is on , that Is the reason I think I am in limp mode.
    Isuzu KB 250 4x4 D-teq OME suspension

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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    Sorry for the long thread I just don't want to waste time going over what I have already done. My 250 Dteq is giving me some grey hair, probably payback for almost getting stuck at the big mud pool at Dewildt a while ago. I have just replaced the scv and the fuel pressure regulator after having irregular issues of uneven idling and engine cut out and the engine scan done at a specialist pointing to the said parts. New filters fitted serviced fully etc. Now having the following issue she starts but very noisy, engine management light on and can't get it out of limp mode not revving past 2000 rpm. I have checked if the fuel filter is not too restrictive by taking it out, bled the air out the top of the diesel line , MAF cleaned intake cleaned, tank pump seems to be pumping ok, diesel pump checked and definitely pumping very good after a slight loose pipe on the fuel rail the diesel was squirting out like crazy, checked voltages of the fuel pressure regulator and got 5V just switched on and idling, previously scanned as a fault code low volts which was the scanned fault. Tank was taken off and cleaned pump and tank. I need advice about this as I am not sure if there is anything else that could be restricting supply to the pump I have checked full manuals for other filters but couldn't find any. I am almost 100% sure it is restricted fuel supply but not sure what to do anymore. Turbo definitely spools up when driving it starts at just under 2000 and you can feel the power just starting and then restricted by the limp mode. Morning startup is difficult and accompanied by lots of white smoke. Glow plug light comes on and off like normal, once started the first time the engine would start no problem. Any advice from those who know, where am I missing something.
    Last edited by bokvirsports; 2017/06/05 at 02:49 AM. Reason: Addition

  17. #17
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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    Bokvirsports, your symptoms (white smoke and difficulty to start only in the mornings) is normally due to air in the system.

    In stead of looking for low fuel pressure due to a restriction, look for perished rubber hoses or clamps not sealing properly. I think that your bakkie is somehow getting air into the fuel line, thus inducing the limp mode when you go past 2000rpm and the turbo spools up. This will require more fuel and that is when it sucks air into the line.

    I would start by replacing all rubber hoses from the tank to the front and checking all connections.
    Jaco

    Isuzu KB300 DMax D/C 4x4 3" Homemade lift, Bosvark LFR Radio and free-wheel hubs.

  18. #18
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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    Thanks for your reply "I would start by replacing all rubber hoses from the tank to the front and checking all connections."

    This I will attack ASAP this morning and check all making sure there is no place for air to enter the system although I couldn't really see any problems while under the car. When bleeding the system at the top of the engine on the top of the head I could see some small bubbles coming out which is obviously part of the problem and after a while would in fact stop after switching on and off a few times. I tried to start again this morning but not yet got that done I will go and check if there is air in the system now and if so I can only think there is air coming in somewhere, obviously creating a problem.

    My problems were not of this nature before I had this SCV Fuel problem and immediately after replacing the SCV the bakkie started OK and idled fine but would go into limp mode irregularly, upon which Diesel pro in Krugersdorp was kind enough to help pinpoint the Fuel pressure regulator as a culprit she would be driving fine and idle great then suddenly go into limp mode switch off start again and again and again until limp mode is off then it would go fine again after replacing the Fuel pressure regulator I have this permanent limp mode of up to 2000rpm and noisy idling.

    I have also thought this morning it could be the glow plugs not doing their bit. Even after starting the vehicle and driving it a distance 2 days ago in the attempt to get rid possibly of air in the system and heat up the motor to normal temperature I have not been able to get rid of this limp mode. Even a "specialist" Isuzu guru someone known by my friend to fix anything gave up not even being able to start her up.

    A question I have is the following: Does the ECU have to relearn the new SCV and Fuel Pressure Regulator because the original was the Short body SCV which GM have a bulletin about replacing under warranty but at 257000kms I doubt they will honour. I have replaced with the longer body with adapter as suggested.

    IF all else fails I will let a specialist with a good diagnostic machine retest to see if anything else specific comes up as a problem.
    Isuzu KB 250 4x4 D-teq OME suspension

  19. #19
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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    It looks like it is Fixed will report back in a few days.
    Isuzu KB 250 4x4 D-teq OME suspension

  20. #20
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    Default Re: Engine knock 2009 Isuzu Deq 2.5

    What did you do?
    Jaco

    Isuzu KB300 DMax D/C 4x4 3" Homemade lift, Bosvark LFR Radio and free-wheel hubs.

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