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Thread: 4JB Engine, black smoke.

  1. 22nd June 2013, 08:14 PM #21
    justinc's Avatar
    justinc
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    sounds like the boost compensator on the pump has been adjusted, too. this adds extra fuel under load/ boost. if you rotate the diaphragm it is attached to an inverted eccentric cone that the fuel governor pin runs against inside the pump. as the diaphragm is forced down under boost, it enrichens the fuelling. this is very adjustable and allows lots of performance enhancements. will cause smoking if rotated too far, and the spring that the diaphragm pushes against is adjusted via moving its seat (commonly referred to as the star wheel) down to bring in boost fuelling earlier.

    this is an instruction pdf from thermoguard instruments. Ian, thank you)

    http://www.landroverweb.com/Pdf-file...ines_Rev_2.pdf

    this is basically exactly the same as your pump, at least the adjustments are the same type and do the same things

    jc
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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  2. 22nd June 2013, 08:45 PM #22
    Davehillbo
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    Haha, I think that's beyond me now!
    Im ok with the basics but anything else , don't want to bugger anything!

    Really appreciate the thought u put into this for me bud.

    David.
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  3. 22nd June 2013, 10:53 PM #23
    Davehillbo
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    One last thing, How do you adjust idle RPM?
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  4. 23rd June 2013, 08:22 AM #24
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    justinc
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    There is a screw that sits against the throttle lever at rest, it is long and has a locknut. Just opposite it the other side of the lever is the full travel adjustment, do not touch that.

    JC
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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  5. 23rd June 2013, 11:11 AM #25
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    Quote Originally Posted by justinc View Post
    There is a screw that sits against the throttle lever at rest, it is long and has a locknut. Just opposite it the other side of the lever is the full travel adjustment, do not touch that.

    JC
    Mine revs high at idle too, have adjusted throttle stop as above all the way off but still revs high, now what? Are thinking it may be a side effect of the fuel screw being all the way out? Any ideas?
    Cheers, Andrew.
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  6. 23rd June 2013, 05:36 PM #26
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    Quote Originally Posted by taylorslandy View Post
    Mine revs high at idle too, have adjusted throttle stop as above all the way off but still revs high, now what? Are thinking it may be a side effect of the fuel screw being all the way out? Any ideas?
    Cheers, Andrew.
    The fuel screw usually only comes into play in terms of how much fuel is delivered at max throttle.

    For a 4bd1 at least you need a higher than normal idle or you will get your teeth shaken out at the lights.
    Hercules: 1986 110 Isuzu 3.9 (4BD1-T)
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  7. 23rd June 2013, 08:46 PM #27
    Davehillbo
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    Tachometer says im idling at 500rpm, but I have no idea if its accurate!
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