Isuzu KB300 LX Troubles :( Advise needed (P0251)





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  1. #1
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    Default Isuzu KB300 LX Troubles :( Advise needed (P0251)

    Hi 4x4 community.

    I'm new to this forum, but have read helpful threads in the past, and I just love the collective wisdom here.

    I've had a Isuzu kb300 LX 2nd hand for about 4 years, and I've been loving it, up until the beginning of this year when a few things started going wrong..
    Before I jump into that, the bakkie is:

    * 2005 Model
    * 272 000 Km on the clock
    * Bakkie is paid off, and not on a service plan

    So here is my history of problems this year in order.

    1. Bakkie started cutting out randomly.

    No power on dash board, radio dead, ignition dead. After about 1-2min, it would come back to life.
    It did this on and off for a few weeks, until the one day it cut out and didnt come back on.

    * Dealership pickup up 4WD module and Air Mass Meter faults
    * Replaced Air mass meter (put 4WD on hold for cashflow)

    2. Two months later bakkie started the same as point 1 again.

    * Dealership picked up P0251 error "Injection Pump Fuel Metering Control "A" Malfunction (Cam/Rotor/Injector)" and referred me to a diesel pump specialist
    * Diesel Pumps guys referred me to a Auto Electrician, otherwise its R7000 just to test the pump, but half the pump is electrical so it could be a small fault with electrics.

    3. Went to Auto Electrician.

    * No faults found, as vehicle was working when he checked it. (as the vehicle only cuts out randomly every 2-3 days)
    * They told me to just drive it until it cuts out again, then bring it to them then.

    What to do next?
    I have this bakkie here which I dont really want to drive as it would be dangerous cutting out on the highway when driving (breaks, steering lock ect)But I'm hesitant to fork out 7k to get the pump tested for something that might not even be the issue?I'm actually in the mind of just selling the vehicle with its problems, but this is a separate topic all together.

    I'm hoping you guys have some light to shed on my bakkie woahs.
    Last edited by SheldyM; 2019/06/25 at 10:09 AM.

  2. #2
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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    This is very general.

    Because the issue appears to be intermittent, I would lean towards the electrical side. Loose earth or faulty connector(s) to start with
    There is no such thing as inclement weather, only poor selection of clothing.... or Vehicle

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  4. #3
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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    If you say there's no power on dash when it cuts out, I'd start looking at the main ignition relay, maybe even the ignition lock, earth points - get to the root of the cause!

    I'm sure all cars must have a main ignition relay? I'm only talking from experience while studying my Land Rover's electrical system.
    Last edited by guido.e.koch; 2019/06/25 at 10:19 AM.
    Off-road: '14 Isuzu KB300 4x4
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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    I had a similar problem on my DMAX around 150k. Ended up being the negative terminal, somehow it got stretched and even when i tighten the nut fully I could still move it. Fixed that and it ran fine.
    Shawn
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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    Contact Mario (on the Forum) he specializes in Isuzu, not on here often though, if you want I can PM you his number.
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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    You should be contacting this oke.

    He is the local Isuzu guru. Stay away from Hayes and the agents. They actually do not know what they are doing.

    Mario Fourie is well know and respected for his knowledge on Isuzu.

    THose are awesome bakkies, I had one as well sold her with 413k on clock. just driven in

    Did you see DUP @ Dup Diesel for the injector/Pump? - he is the right oke.

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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    Quote Originally Posted by SheldyM View Post
    No power on dash board, radio dead, ignition dead. After about 1-2min, it would come back to life.
    This to me screams electrical issue.

    I would start by checking Battery and Terminals.
    Earth points - loosen them, sand off all corosion, lubricate and put back.
    Then ignition and the main power feeds to and from it.

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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    Quote Originally Posted by Dwayne P View Post
    You should be contacting this oke.

    He is the local Isuzu guru. Stay away from Hayes and the agents. They actually do not know what they are doing.

    Mario Fourie is well know and respected for his knowledge on Isuzu.

    THose are awesome bakkies, I had one as well sold her with 413k on clock. just driven in

    Did you see DUP @ Dup Diesel for the injector/Pump? - he is the right oke.
    Thanks, I will definitely give Mario a shout.
    And yes, DUP Diesel where the guys the agents referred me too, but they suspect the problem is Electrical, and referred me to their AE guy, who couldnt pick anything up. But lets see if Mario can sort me out

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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    Quote Originally Posted by Brannas View Post
    This to me screams electrical issue.

    I would start by checking Battery and Terminals.
    Earth points - loosen them, sand off all corosion, lubricate and put back.
    Then ignition and the main power feeds to and from it.
    I'm printing this off and taking it to the Auto Electricians - thank you!

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    Thumbs up Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    I've contacted Mario, and he put me forward to Gerard at Automax to check all the AE.
    I've booked the vehicle in for next Monday, and will keep you guys updated.

    Blown away by the prompt responses and solid advise so far guys.

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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    Apologies for the 'hi-jack' but in your opinion who is the 'Isuzu Guru' in the Pretoria-Centurion-Midrand area, specifically relating to fuel systems, ie. diesel pump,injectors, etc.

    My son has the same model with 280K on the clock. Starting is becoming a problem with excessive 'blue' smoke with a very rich smell of diesel. Our first thought is dirty injectors but it might also be the diesel pump hence the need for a specialist (other than the dealers) that could check/test/advise.

    Thanks
    Happy are those that dream dreams and is willing to pay the price to make them come true

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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    Quote Originally Posted by IceAge View Post
    Apologies for the 'hi-jack' but in your opinion who is the 'Isuzu Guru' in the Pretoria-Centurion-Midrand area, specifically relating to fuel systems, ie. diesel pump,injectors, etc.

    My son has the same model with 280K on the clock. Starting is becoming a problem with excessive 'blue' smoke with a very rich smell of diesel. Our first thought is dirty injectors but it might also be the diesel pump hence the need for a specialist (other than the dealers) that could check/test/advise.

    Thanks
    Northen Diesel
    Neil

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  19. #13
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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    Agree, had mine at them for some tenderlove and care and they did a great job, see the isuzu section for my praise
    Robert

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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    Quote Originally Posted by SheldyM View Post

    No power on dash board, radio dead, ignition dead. After about 1-2min, it would come back to life.
    It did this on and off for a few weeks, until the one day it cut out and didnt come back on.
    This sounds a bit like a problem I had on my defender. Tracker, on installing their unit in my dashboard, managed to dislodge a plug from the dashboard cable to the ignition switch. They got it back in, but not properly. Miles from nowhere, vibrations from a dirt road shook it loose, shutting down most of the vehicle, including the engine and windows.

    We had to open up the steering column to get in under the dashboard unit. The tracker unit was up against the dashboard cable, putting tension on and vibrating against it. One plug from this cable was out. It plugged into the back of the ignition switch. It was very, very difficult to properly click back into place.

    Maybe look at the cable that comes out of the dashboard unit that contains your speedo, rev counter etc (mine was a thick one with a number of plugs at the other end), and see that all its plugs are still properly plugged in, look for signs of wear/tension and check the unit isn't faulty.
    Stuart

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    Default Re: Isuzu KB300 LX Troubles :( Advise needed (P0251)

    Hi I am not sure if this is relevant, but had trouble with my Isuzu Kb250dc. When hot the engine would not start, then eventually it would not start at all. I took out the immobiliser, took about 2 hours of carefull chiseling as I could not get the vehicle to a diesel pump service center. Found a 12 volt connection to the PC board, and connected this to the solenoid. The car then started and runs /switches off normally.
    What I now however need help with is understanding how the Fuel injector pump is supplied with fuel. At about 550k km the engine started to die when the fuel level in the tank got low. Water damage to the lift pump in the fuel pump was diagnosed as the problem, and repaired by Diesel Electric. The engine has now run more than I million Km, and still does not need the oil topped up between changes.

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