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  1. #13
    Advanced Member clifton's Avatar
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    Aug 2007
    Location
    Cairns, QLD
    Posts
    788
    Hi Steve /Sandra,

    No they do not inject on every stroke otherwise we would get severe fuel dilution and high bearing surface wear, but I know where you are coming from.

    The 1KD-FTV engines are HCCI Engines which stand for Homogeneous Combustion Compression Ignition Engines what a lovely acronym Aye.

    The Toyota IKD-FTV engine uses UNIBUS (Uniform bulky combustion) which comprises a combination of early and late injection timing.

    The operation is up to half load and speed. The concept is described by
    Toyota Engineers and many papers have been written on the subject.

    The early injected fuel undergoes a low temperature
    reaction while the late injection serves as an ignition trigger and sets off
    the high temperature reaction. The first injection or pilot injection quantity is small.

    Hope this helps a little
    07 Upgrade GXL D4D, Manual, Dune,Sov Bar, BFG's, SG11, Redark dual Batts, Extensive Aux wiring, Stebel, LED stop tails, IPF HID's (my mod), 240V Inv, ARB Comp, GME UHF,TPMS, Safari snorkel, GPS,Hilux washers, 40l Engel in 30% pas pos,homemade A/C cond protection plate, polyairs.

  2. #14
    I wonder if the unacceptable noise in some D4D engines has something to do with the oil used and/or age of the oil. Those of you with this problem could you please advise the following;

    (1) How many kilometres after the oil was changed did the noise first appear?

    (2) What is the viscosity of the engine oil?

    (3) Is the oil fully mineral, partly synthetic or fully synthetic?

    (3) Can you please advise the brand and type of oil?

    Thanks
    Glenn

  3. #15
    I was under the impression they also injected on the exhaust cycle to improve the stoichiometric condition, also to reduce NOx and PM.
    I have been out of the trade a long long time. So im trying to learn again.

    Cheers

    Steve
    Lightforce 240Blitz driving lights, Rear hitch recovery point, GME tx3400 uhf, 64watt Uni-Solar cell, ARB CKMA12 Air compressor. all awaiting new vehicle to be delivered so they can be remounted.

  4. #16
    for others that may be interested.

    UNIBUS ( uniform bulky combustion system )

    Technology that enables rapid combustion at low temperatures, by dividing fuel injection into a diesel engine into two stages, first creating a preliminary air-fuel mixture and then delaying the injection timing for the remaining fuel.

    Also used to reduce the combustion noise at lower engine loads and speed.

    its also related to the exhaust emissions

    Cheers

    Steve
    Lightforce 240Blitz driving lights, Rear hitch recovery point, GME tx3400 uhf, 64watt Uni-Solar cell, ARB CKMA12 Air compressor. all awaiting new vehicle to be delivered so they can be remounted.

  5. #17

    diesel rattle in D4D Prado

    My D4D is doing exactly the same. Started about 1000Kms ago at 31000Kms. Sounds like one cylinder only. Stops after 2 minutes. Loudest at 2000rpm under modest load. Oil change made no difference. Quite scary!
    2007 D4D Manual GX, ARB bar, Coopers, Dual Batteries, Codan HF Radio with rear HF Bracket, 2M VHF, 70cms UHF, UHF CB, APRS, Tom Tom GPS, Rally Computer, Waeco Fridge, In-built Water Tank.

  6. #18
    Member
    Join Date
    Feb 2006
    Location
    Swan Hill - Victoria
    Posts
    150
    I drove a mates Hilux one cold morning and it definately made the same noise under slight throttle at about 2000rpm. This is a work ute and now has 145,000kms under its belt with the noise being the same since new.
    Very wierd after getting used to a 1kz when cold.

    From what I understand it is just a common rail thing of injecting a very small amount of diesel very early in the cycle to get ignition and then injecting the full fuel load at the correct time. This is all to meet emissions which are now very strictly controlled even with a cold engine (previously emission levels only needed to be met with hot engine).


    Quote Originally Posted by Steve & Sandra
    Ive worked on cummins engines that used to rattle until the lube oil was up to temp, it was called step timing i think. Its been years since i was in the trade.
    The old Big Cam 4 is not even in the same universe but even in 1986 they where trying to advance the timing when the engine was cold to cut down on smoke. The rattle is not that much different though


    Ben
    2008 Holden Calais 6ltr

  7. #19
    Advanced Member clifton's Avatar
    Join Date
    Aug 2007
    Location
    Cairns, QLD
    Posts
    788
    Hi Steve,
    You are correct there is a post injection, the whole reason for the HCCI engine development was to meet Euro NOx and particulate emissions from diesel engines, I didn't elaborate on the techo bits as I didn't want to bore our members with Diesel Theory.
    07 Upgrade GXL D4D, Manual, Dune,Sov Bar, BFG's, SG11, Redark dual Batts, Extensive Aux wiring, Stebel, LED stop tails, IPF HID's (my mod), 240V Inv, ARB Comp, GME UHF,TPMS, Safari snorkel, GPS,Hilux washers, 40l Engel in 30% pas pos,homemade A/C cond protection plate, polyairs.

  8. #20
    Yep - mine has just started to do this at 17,000km / 6 months old
    07 Prado GXL, D4D manual, silver ash, Sovereign bullbar, towbar, spotties, dual batts, BFG A/T, sunroof, TXE 4400, window tints, headlight & bonnet protectors, floor mats, Navman MY60T, 2" Ultimate suspension, Polyairs, snorkel

  9. #21

    D4d cold start rattle

    my april 2007 started on the dot of 20,000Km.
    It did not do it last winter.
    Today was not the coldest day this year so far.
    The oil change was done a week after it started doing it.
    Its getting worst. Today i had passengers and a bystander ask " what the %$#% is wrong with the motor ! ".

    1, Its a Y2K + DST bug ;-)
    2, Something has happened to the fuel we are using.
    3, One of the senders is confused or contaminated.
    4, Some timer/run in counter in the ECU thinks its time to change injection methods.

    Can we also try to work out that week we started to get the noise.
    Mine was two weeks ago.
    2007 120 D4D VX Auto.
    1985 LWB Suzuki Sierra 1600.

  10. #22

    d4d cool start rattle

    Well , i don't think its COLD oil/motor thats doing it.

    Yesterday at 8:30am the air temp was 6^c ( as low as 4.1 at 6:30am).

    Today it was 12 Deg^C and it was as noisy as yesterday ( got as low as 7.1^c at 1:30am).

    I'll change the display on the scangaugeII so it will come up with water and air intake temp straight up.
    2007 120 D4D VX Auto.
    1985 LWB Suzuki Sierra 1600.

  11. #23
    Today from the ScanGaugeII water temp 13^c. Air Temp 13^c.
    Clock/dash mounted outside air temp 13^c.

    It was as noisy as ever.
    The noise started to lessen after 2 Km @ 50 Km/h as the water temp got to 50^c ( this is also when the main temp gauge just gets to the lower section of the arc next to cold.)
    The noise was still evident but in a much narrower rev range ( now 2200 to 2400) after 5 Km ( as the temp got to 83^c).
    The noise was still there up to 7.5Km and when the motor had been at 84 to 85^c for 3 or 4 minutes.


    ( i sent this to another prado list as well )
    2007 120 D4D VX Auto.
    1985 LWB Suzuki Sierra 1600.

  12. #24
    Advanced Member Crammy's Avatar
    Join Date
    Oct 2007
    Location
    Cairns, QLD
    Posts
    763
    It sounds like there's varying degrees of the noise out there. Mine starts up with the cold shakes every morning at around 20 degrees, has done so since new. I just thought it was normal for diesels after driving my parents 3.0L patrol which makes an almighty racket when it's cold (also common rail).

    I'm not too worried about mine at the moment, although if it gets loud enough to wake up the local yappers I might have to get it looked at! :shock:
    2008 GXL M6 D4D, Silver
    Build Up---> http://www.pradopoint.com/viewtopic.php?t=2315

    {ATS Ridepro/Bilstein Lift} {Dual Batteries with RanOx Battery Booster} {600w Projecta 240v Inverter} {Dunlop AT3's / MT MTZ's on Speedy Grande Rims} {ARB Deluxe Winch Bar} {IPF900XS Spotties - Converted to 50w 4300k HID} {35w H4-3 4300k HID Hi-Lo Conversion} {ARB Underbonnet Compressor} {GME TX3440} {T-Max 10,000lb winch} {Safari Snorkel} {Milford Cargo Barrier} {Rhino HD Roofies & AT1410 Roof Tray} {60L Waeco}
    http://www.gifs.net/Animation11/Tran...heel_drive.gif

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