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Thread: Vacuum leak test results on GQ RB30 Patrol

  1. #1
    Legendary dom14's Avatar
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    Vacuum leak test results on GQ RB30 Patrol

    Hey guys,
    I just did a cigarette smoke test on my RB30 Patrol today.

    Here I attached the photos of the results.
    I disconnected the LPG primer vacuum hose from the LPG converter.
    Then, I smoked a cigarette and blew the smoke into the LPG primer vacuum hose open end.
    Engine was cold and not running
    Smoke came out of the air cleaner inlet, top of the LPG mixer & LPG hose joint and then a
    temperature sensor(I think) attached to the vacuum line and radiator-cylinder head hose joint(the coolant system)

    I would appreciate a bit of help with how to interpret the results.
    Thanks

    The reason for this test is that the engine is still not running ok. It's hesitating and miss firing more than half of the time.
    I'm hoping to rule out any vacuum leak/vacuum advance issues before I move onto other areas to find the issue
    Attached Images Attached Images
    • File Type: jpg 1.jpg (301.3 KB, 37 views)
    • File Type: jpg 2.jpg (254.4 KB, 34 views)
    • File Type: jpg 3.jpg (258.4 KB, 34 views)
    • File Type: jpg 4.jpg (256.1 KB, 34 views)
    • File Type: jpg 5.jpg (227.0 KB, 34 views)
    • File Type: jpg 6.jpg (322.0 KB, 39 views)
    Last edited by dom14; 11th June 2015 at 11:07 AM.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

  2. #2
    Patrol God mudnut's Avatar
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    If you suspect a vacuum leak, then
    it is easier to spray WD40 around
    the hoses, intake and manifold gasket
    while the engine is running.
    If some spray is drawn into the
    engine, then you will hear
    the revs increase marginally.
    My advice is: not to follow my advice.

  3. #3
    Legendary dom14's Avatar
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    Quote Originally Posted by mudnut View Post
    If you suspect a vacuum leak, then
    it is easier to spray WD40 around
    the hoses, intake and manifold gasket
    while the engine is running.
    If some spray is drawn into the
    engine, then you will hear
    the revs increase marginally.
    Yeah, I did it few months back with carby cleaner. I couldn't find any.
    But, I didn't spray the carby cleaner on this thermal vacuum switch thingy or on the top of the mixer where it leaked this time.
    I reckon I should do it fist thing tomorrow morning.

    I thought a smoke test is more reliable, except that it can't be done when the engine is running(or can it?).

    I found this old thread.

    http://www.nissanpatrol.com.au/forum...Name-this-part!!!

    Apparently it's a thermal vacuum switch.
    But, the smoke leaking out of it during my cold engine(not running) smoke test kinda indicates it's not working.
    It shouldn't leak smoke when it's cold if it only allows vacuum connection pass through when hot.
    Either way, I don't think the smoke should come out of it whether the engine is cold or warm.
    So, I'm guessing it's gone cactus?!!
    But, I need advice from experts here.
    For a while, I've been looking into the idea of getting the vacuum advance system checked.
    I need to understand how it works first.
    I'm slowly doing it at the moment.
    Last edited by dom14; 10th June 2015 at 08:28 PM.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

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    Legendary dom14's Avatar
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    I'm also suspecting the possibility the Charcoal fuel vapour canister can be faulty or need cleaning(if that's possible).

    Apparently there is a valve inside the Charcoal fuel vapour canister.

    I am following few youtube vdeos and google literature to test it first and then fix if it's possible.
    Last edited by dom14; 10th June 2015 at 08:39 PM.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

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    Legendary dom14's Avatar
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    This is a quoted post from that above old thread

    The valve is a thermal vacuum valve orTVV it is a vacuum valve which controls the EGR or exhaust gas recirculation valve.
    It helps with controlling the exhaust gas emissions. You may get an after market one from repco or supercheap other wise just block the hoses off[



    I think smoke leaking from the top of this thermal valve can't be right.
    I reckon it's faulty.

    Can any of you experienced blokes confirm my suspicion?
    Attached Images Attached Images
    • File Type: jpg 7.jpg (195.6 KB, 22 views)
    Last edited by dom14; 10th June 2015 at 08:44 PM.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

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    Legendary dom14's Avatar
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    The problem is that above quoted post says with some good insurance this thermal vacuum switch is actually connected to the EGR system.

    That gives me a fright 'cos I have actually blocked the EGR pipe(from exhaust to the inlet manifold.
    So, there's no exhaust fumes get into the inlet manifold now.

    I need to have a closer look where those two vacuum hoses from the thermal vacuum switch connect to.

    I'll post more pictures soon.

    I'm also hoping to do the smoke test again tomorrow morning and post the video here.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

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    Legendary dom14's Avatar
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    The reason for this test is that the engine is still not running ok. It's hesitating, miss firing or almost cutting off more than half of the time. I haven't ruled out any electrical issues or distributor itself.
    I'm hoping to rule out any vacuum leak/vacuum advance problems before I move onto other areas to find the cause of the problem.


    I attached photos below where it shows the vacuum lines from the thermal switch.
    Attached Images Attached Images
    • File Type: jpg 1.jpg (285.3 KB, 26 views)
    • File Type: jpg 2.jpg (198.0 KB, 25 views)
    • File Type: jpg 3.jpg (243.8 KB, 23 views)
    • File Type: jpg 4.jpg (260.4 KB, 26 views)
    Last edited by dom14; 11th June 2015 at 01:05 PM.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

  8. #8
    Expert billyj's Avatar
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    i think your better off doing the wd40 test and looking for a change, even hook up a cheap vac gauge and see what differnce in readings you get when it does play up.

    what part of the world are you located in mate? kinda hard to diagnose this stuff over the internet

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    Legendary dom14's Avatar
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    Quote Originally Posted by billyj View Post
    i think your better off doing the wd40 test and looking for a change, even hook up a cheap vac gauge and see what differnce in readings you get when it does play up.

    what part of the world are you located in mate? kinda hard to diagnose this stuff over the internet
    Yeah, I know mate. It isn't easy. But, I'm fixed on the idea to make it or break it this time.
    GQ has been displaying some weird behaviour for a while. WD40 test didn't find anything.
    I have an el cheapo vac gauge somewhere in a box. I did it while ago, I reckon it's time for it again.

    I like the idea of doing as much as I can, 'cos it comes handy in the bush.
    I also like the idea of documenting as much as I can here, so it comes handy for other blokes in a similar situation.
    I'm gonna go through the manual again and follow some of the diagnostic tips from there.
    Sometime the vehicle runs beautifully without a cough, then next time it's having hiccups.
    So, it's kinda sound like electrical, but I'm yet to locate it.
    ATM, the engine cold idles at around 500-600 and the problems start out of nowhere when on the road.
    Carby was done not too long ago. I gota backup carby, but it idles too high(need some work on it).
    Last edited by dom14; 5th July 2015 at 04:13 AM.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

  10. #10
    Legendary dom14's Avatar
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    What I would 'kill' for is an RB30 Nikki carby repair/service manual.
    I'm happy to pay if anybody gota one. Even a PDF one will do.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

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