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Thread: 4D56 delica - glow plug problem

  1. #1
    Join Date
    Dec 2008
    Location
    melbourne AU
    Posts
    2

    4D56 delica - glow plug problem

    hi all...

    just managed to get my hands on a beautiful 89 mitsubishi delica 4x4 van - 4D56 turbo diesel model. i'm planning on getting a bio setup running for her, but first need to sort out a wee (i hope...) problem and was hoping someone could give me a few pointers.

    i'm guessing it's the glow plugs, but am not so sure being a bit new to diesels. it starts perfectly when the engine is warm and runs very well, plenty of power. the problem is starting from cold. even after leaving the ignition on for a whole minute before cranking, it generally takes about three longish attempts to get it started. and while it's cranking over, it blows smoke, finishing with a giant black cloud when it finally kicks in. after that it runs a bit shakily for a while, but clears up as if nothing had happened after running for two minutes.

    when i turn on the ignition, i can't hear a loud click which suggests to me it's perhaps a faulty glow plug relay. i used to have a 4D55 pajero and could clearly hear the relay click when i turned on the ignition...

    anyone got any ideas? if it is the relay, could anyone suggest where i can find it, and how to test it? otherwise if it's the glows, is there a relatively idiot-proof way of taking them out and inspecting/replacing them or should i be getting a mechanic to do it...? or is it perhaps another problem that i haven't thought of....?

    thanks!

    jon.

  2. #2
    Join Date
    Sep 2005
    Location
    WA
    Posts
    4,373

    Re: 4D56 delica - glow plug problem

    It does sound like GP failure.
    To check, get a multimeter and measure the voltage on the glow plugs when someone turns on the Ignition switch.

    If you have 12V it indicates the GP relay is OK, but some GPs may be blown.
    If you have 10-11V it indicates you have several GPs working, starting should not be a big problem.
    If you have less than 10V but more than 1V you have a wiring fault (high resistance connection or GP relay contacts burnt)
    If you have less than 1V you have a problem with the GP relay or the fusible link supplying the GP current.


    Removal of the GPs:

    Remove wires (or conductor strip) from all GPs and put aside.
    Use a multimeter and measure the resistance from the connector terminal to the head. Compare this with the short-circuit multimeter leads. the short circuit should be 0 ohms, the GP should be 0.5 - 1 ohm.
    Using a jumper lead, connect +12v to each GP in turn. there should be a healthy spark when connecting and disconnecting, but should not be like welding (this indicates a short circuit GP)
    For those which do not measure between 0.5 and 1 ohm (compare with a new GP for the vehicle):
    Using the correct spanner, undo the GPs one at a time and remove from the head. NOTE: they may be difficult to remove, but be patient or you could break one off in the head (may need head removal to retrieve the broken bit of the GP)
    Install new GPs (best to do a full set and keep any good old ones as spares, should a new one fail)
    Re-tighten the GPs and reconnect the electrical connections.

    Verify the voltages as above are now correct.
    Start the vehicle and enjoy the experience.


    The above are just guides and the problem may be elsewhere.
    Have Fun
    Tony
    Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

    Current Vehicles in stable:
    '06 Musso Sports 4X4 Manual Crew Cab tray back.
    '04 Rexton 4X4 Automatic SUV
    '2014 Toyota Prius (on ULP) - Wife's car

    Previous Vehicles:
    '90 Mazda Capella. (2000 - 2003) My first Fatmobile. Converted to fun on veggie oil with a 2 tank setup.
    '80 Mercedes 300D. 2 tank conversion [Sold]
    '84 Mercedes 300D. 1 tank, no conversion. Replaced engine with rebuilt OM617A turbodiesel engine. Finally had good power. Engine donor for W123 coupe. (body parted out and carcass sold for scrap.)
    '85 Mercedes Benz W123 300CD Turbodiesel
    '99 Mercedes W202 C250 Turbodiesel (my darling Wife's car)[sold]
    '98 Mercedes W202 C250 Turbodiesel (my car)[sold]
    '06 Musso Sports Crew Cab well body. [Head gasket blew!]
    '04 Rexton SUV 2.9L Turbodiesel same as Musso - Our Family car.
    '06 Musso sports Crew Cab Trayback - My hack (no air cond, no heater).

    Searching the Biofuels Forum using Google
    Adding images and/or documents to your posts


  3. #3
    Join Date
    Sep 2006
    Location
    Brisbane
    Posts
    192

    Re: 4D56 delica - glow plug problem

    You can use the idiots guide to see if the glow plugs are working by (carefully) removing them one by one. Reattach the lead and turn on the ignition/plug circuit. If it gets hot - it works.
    Slippery
    Small steps taken one at a time.

  4. #4
    Join Date
    Oct 2005
    Location
    Sunshine Coast, QLD
    Posts
    708

    Re: 4D56 delica - glow plug problem

    I have the electronic manual for that engine. (4D55/56)PM me if you want a copy.

  5. #5
    Join Date
    Jul 2006
    Location
    sydney
    Posts
    261

    Re: 4D56 delica - glow plug problem

    Gday
    Just make sure your glow plugs are 12 volt before applying power to them individually, some cars use 6 volt plugs
    thanks caveman

  6. #6
    Join Date
    Dec 2008
    Location
    melbourne AU
    Posts
    2

    Re: 4D56 delica - glow plug problem

    hi all... thanks heaps for all the advice. i checked out the glows - they looked in pretty good nick to me, so i ended up taking the van to an auto sparky to get the circuit checked out.
    turns out the problem was with the timer that turns the glow plug circuit on/off. being an old import it's a bit of a task to find a replacement, so i just installed a manual push-button switch to activate the glows - no timers, no thermostats. works fine now - you just need to hold the button in for a few seconds before cold starting. and now i can also be sure the glows aren't staying on too long after the engine starts...
    jon.

  7. #7
    Join Date
    Aug 2010
    Location
    New Zealand
    Posts
    1

    Re: 4D56 delica - glow plug problem

    I have this problem with my Delica Starwagon. Is that electronic copy of the engine still available? What section would it be under in the manual? Thanks in advance.

  8. #8
    Join Date
    Dec 2007
    Location
    South Australia
    Posts
    1,243

    Re: 4D56 delica - glow plug problem

    Quote Originally Posted by jon View Post
    hi all... thanks heaps for all the advice. i checked out the glows - they looked in pretty good nick to me, so i ended up taking the van to an auto sparky to get the circuit checked out.
    turns out the problem was with the timer that turns the glow plug circuit on/off. being an old import it's a bit of a task to find a replacement, so i just installed a manual push-button switch to activate the glows - no timers, no thermostats. works fine now - you just need to hold the button in for a few seconds before cold starting. and now i can also be sure the glows aren't staying on too long after the engine starts...
    jon.
    I like that solution, simple but effective.
    Johnnojack
    4WD Isuzu Jackaroo 3.1 200000km on WVO,(2020) 2 tank home built system 6 solenoids FPHE, heated filter fuel line and tank pickup for thicker oil. Mk. 9 version now and no changes planned as trouble free.
    Mercedes W201 190D 1986 model: 2 tank system, bigger fuel line from tank, no heat exchanger, electric pump for diesel 22000km so far

  9. #9
    Join Date
    Nov 2010
    Location
    USA
    Posts
    1

    Re: 4D56 delica - glow plug problem

    Quote Originally Posted by Tony From West Oz View Post
    It does sound like GP failure.
    To check, get a multimeter and measure the voltage on the glow plug when someone turns on the Ignition switch.

    If you have 12V it indicates the GP relay is OK, but some GPs may be blown.
    If you have 10-11V it indicates you have several GPs working, starting should not be a big problem.
    If you have less than 10V but more than 1V you have a wiring fault (high resistance connection or GP relay contacts burnt)
    If you have less than 1V you have a problem with the GP relay or the fusible link supplying the GP current.


    Removal of the GPs:

    Remove wires (or conductor strip) from all GPs and put aside.
    Use a multimeter and measure the resistance from the connector terminal to the head. Compare this with the short-circuit multimeter leads. the short circuit should be 0 ohms, the GP should be 0.5 - 1 ohm.
    Using a jumper lead, connect +12v to each GP in turn. there should be a healthy spark when connecting and disconnecting, but should not be like welding (this indicates a short circuit GP)
    For those which do not measure between 0.5 and 1 ohm (compare with a new GP for the vehicle):
    Using the correct spanner, undo the GPs one at a time and remove from the head. NOTE: they may be difficult to remove, but be patient or you could break one off in the head (may need head removal to retrieve the broken bit of the GP)
    Install new GPs (best to do a full set and keep any good old ones as spares, should a new one fail)
    Re-tighten the GPs and reconnect the electrical connections.

    Verify the voltages as above are now correct.
    Start the vehicle and enjoy the experience.


    The above are just guides and the problem may be elsewhere.
    Have Fun
    Tony
    thanks for the post tony it really helps a lot. i measure the voltage on the glow plug.have a problem because my voltage is less than 10V but more than 1V. and i just discovered that its wiring fault. really helps.

  10. #10
    Join Date
    Oct 2021
    Location
    MT USA
    Posts
    1

    Re: 4D56 delica - glow plug problem

    Quote Originally Posted by jon View Post
    hi all... thanks heaps for all the advice. i checked out the glows - they looked in pretty good nick to me, so i ended up taking the van to an auto sparky to get the circuit checked out.
    turns out the problem was with the timer that turns the glow plug circuit on/off. being an old import it's a bit of a task to find a replacement, so i just installed a manual push-button switch to activate the glows - no timers, no thermostats. works fine now - you just need to hold the button in for a few seconds before cold starting. and now i can also be sure the glows aren't staying on too long after the engine starts...
    jon.
    do you happen to have a write up of the schematics of wiring them to a push button. i need to do this with my mighty max and it seems like a complicated system so i would like to know how you did it so i do not create electrical issues. thank you!

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