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Thread: 300tdi engine lack of power problems

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    Trainee ground-ed's Avatar
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    Default 300tdi engine lack of power problems

    Hi, my 90 300tdi year 97 150k has gradually become very sluggish and underpowered its pretty much like a NA 60-65 flat out. no smoke, starts easy. Just serviced it. So far Checked pump timing/cambelt, injector diaphram, all hoses/connections. It also is a bit tappety noise on tick over and while driving it. Could this just be due to old age losing compression or do you think there might me an easy fix. Is there anything on the electronic side that could be causing this will it benefit blanking egr valve? I can feel the turbo kicking in but might the turbo side of things be at fault?
    1968 2a 2.5 petrol rebuilt
    1986 110 hi-cap being rebuilt

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    Default Re: 300tdi engine lack of power problems

    Could well be the lift pump if you've changed all the filters. Does it have an ECU or standard injection pump? EGR can affect performance but that like most other things also produces smoke.

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    Engineer WestRec214H's Avatar
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    Default Re: 300tdi engine lack of power problems

    ditch the EGR system 7 blank off the manifold fitting hole, change the fuel lift pump.

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    Default Re: 300tdi engine lack of power problems

    Check the tappets as well if they are noisey.

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    Default Re: 300tdi engine lack of power problems

    I will check the tappets does anyone know the correct gap or know where i can get info from. Is there a way i can check the lift pump is working properly the filter was full when i changed it?
    1968 2a 2.5 petrol rebuilt
    1986 110 hi-cap being rebuilt

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    Forum Approved Trader, Td5 specialist. Porny's Avatar
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    Default Re: 300tdi engine lack of power problems

    If the filter is full, then the lift pump is working correctly.

    Did you have a good look at the pump diaghram for even the smallest split? Check that the pipe from the turbo to the injector pump is ok - they can rub on parts of the engine and split.

    When was the cambelt last changed ?

    At that mileage it would be worth getting the injectors checked/refurb'd... as the problems your having could be down to a duff injector (or one with a bad spray pattern.

    As mentioned above, get rid of the EGR.

    Then check turbo boost pressure.


    Ian
    Land Rover Diesel Tuning and Diagnostics - www.irbdevelopments.com

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    Default Re: 300tdi engine lack of power problems

    its most likely the lift pump that you need to look into .

    usually the pivot pin breaks and the pump wont pump , you also mentioned a tappety noise, well thats what youll hear if the pins gone and the lift pump arm isnt doing anything except rubbing against the driving part . .

    even though the pump isnt working , the injector pump will suck enough fuel up for youre engine to run at low performance .

    its a tell tale sign if youve lost the higher end power , that the lift pumps got something wrong with it , or its internal filter is blocked up .

    if you have a delphi type pump, ie aluminium, it may have a screwed on top which houses a gauze filter , this filter could be blocked by paint chips and debris from inside the tank .

    if you dont have a filter with the removeable top then you will have to just fit a new pump and see how things progress .

    dont forget you need 2 olives and 2 nuts to go with a new lift pump, for the fuel lin connections .

    mine has failed twice on me , so i know the usual things that happen to a 300tdi , and many other people are of the same opinions too ha ha .

    .

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    Default Re: 300tdi engine lack of power problems

    Did you service it because it was sluggish or has it become sluggish since the service?

    As Porny says, check the turbo pipes, it won't boost if air is escaping, but you will hear it spooling up.

    If the tappets are too wide, it will be late opening the valves.

    It is also worth pumping the brakes on tickover and seeing if the noise gets better or worse, that would be the vacuum pump, another common 300 problem.

    Chris
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    Default Re: 300tdi engine lack of power problems

    and the tappets should be adjusted to 0,20 mm. Quite easy job.

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    Default Re: 300tdi engine lack of power problems

    wow thanks for all your advice and ideas i will look into them all next week. I just serviced it because it needed doing, i held the pump diaphram up to the light and looked at it for ages hoping for a slight hole/split but nothing has been sluggish like this for ages. "m0bcg." might it still be the lift pump even though the filter was full up with fuel?
    1968 2a 2.5 petrol rebuilt
    1986 110 hi-cap being rebuilt

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    Default Re: 300tdi engine lack of power problems

    I have had new fuel filters that were partially blocked! Check lift pump and pipework performance by partially opening the filter vent plug while the engine is running, there should be fuel pressure but no continuous air after perhaps a small initial amount.

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    Default Re: 300tdi engine lack of power problems

    Hi, i finally got around to looking at my 90 again as its been off the road for a few months. The lift pump is working fine i have removed it and inspected it. The fuel is getting through fine and all pipes and hoses have been checked and are fine.
    Im worried it could be a more serious problem. Its making a deep knocking noise every stroke and just very flat performance maybe 3/4 of power but no coughing and spluttering. (i know its very difficult to describe a noise and i will try to record it) Do you think its worth doing a compression test. Im thinking it could be a blown head gasket between 2 cylinders is this very likely? I have ordered a egr valve blanking kit, the pump diaphram is fine aswell.
    1968 2a 2.5 petrol rebuilt
    1986 110 hi-cap being rebuilt

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    Default Re: 300tdi engine lack of power problems

    I you haven´t made sure yet, the injectors are ok, I should change them. It still could be one of them is not working.
    A leaking head-gasket often gives white smoke or bubbles in the waterreservoir. And it doesn´t make the sound change.

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    Default Re: 300tdi engine lack of power problems

    A problem I have had with a couple of 300tdi engines is the accelerator cable. it slackens off at the adjuster on the Injection pump (metal thread in a plastic collar) Produces the symptoms you describe, gutless performance but no obvious cause.

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    Default Re: 300tdi engine lack of power problems

    thanks i have checked the accelerator cable and it was slightly slack but not to bad. i have also checked tappets and found the 4th cylinder exhaust valve was very slack so hope fully im getting somewhere. Im going to remove injectors and get them tested does anyone know a good place for this through mailorder or is it worth just changing them anyway.
    With the headgasket issue i was thinking it could be blown between 2 cylinders but not through water channel. Has this happened to anyone before or is it unlikely.
    1968 2a 2.5 petrol rebuilt
    1986 110 hi-cap being rebuilt

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