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Odd noise and 2WD malfunction


 
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Si7
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PostPosted: Sat Feb 23, 2019 2:15    Post subject: Odd noise and 2WD malfunction Reply with quote

Always run in 2WD and slowing for an island earlier there was a whirring sound, much like tyre tread rubbing on something, thought it was the van next to me but it continued, committed to island and had to proceed, noise disappeared accelerating back up to speed, pulled into next layby and the same noise re-appeared on slowing. Stopped, rolled underneath, looked for caught stick rubbing on tyre tread, nothing, crawled everywhere and under bonnet, all good. Climbed back in cab, restarted, top 2 Super Select lights flashing now.

Manually selecting 4WD fixes everything, does this sound like a slow vacuum leak allowing 4WD to creep into/push out 2WD while 2WD is still manually selected? Headed out again later tonight, still in manual 4WD, tried manual 2WD again out of interest, all good. Few mins later, same noise slowing and 2WD drops out, top flashing lights again. Can it be anything but slow loss vacuum?
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PostPosted: Sat Feb 23, 2019 2:15    Post subject: Google Ads keep the POCUK free to join!


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PostPosted: Sun Feb 24, 2019 4:31    Post subject: Reply with quote

This has a motor to select 4 wheel drive so no vacuum leaks, if you do not switch between the two regularly they become sticky and do not work properly. If it is engaging on its own then look for a wiring or switch fault.
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PostPosted: Sun Feb 24, 2019 8:07    Post subject: Reply with quote

assassin wrote:
This has a motor to select 4 wheel drive so no vacuum leaks, if you do not switch between the two regularly they become sticky and do not work properly. If it is engaging on its own then look for a wiring or switch fault.


Picture looks like a gen 2 so no motor. I’d suspect a vacuum leak.
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Si7
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PostPosted: Sun Feb 24, 2019 15:14    Post subject: Reply with quote

Sorry yes, Gen 2. All fixed now, it was the yellow 2WD vacuum solenoid, replaced it and back to normal. The yellow solenoid holds the actuator in 2WD mode, if it fails the actuator slowly creeps back to 4WD (it's 4WD by default) and tries to engage 4WD with a stationary front axle and rotating wheels hence the noise and it's disappearance when 4WD is manually selected.

Good thread here with the exact problem and explanation (ignore the first couple of wheel bearing suggestions)

https://www2.pajeroclub.com.au/forum/archive/index.php/t-13740.html

Also found this, under bonnet picture looks different from Gen 2, might be later model but same issue.

https://photobucket.com/gallery/user/t0me/media/cGF0aDovUGFqZXJvVmFjdXVtZGlhZ25vc3RpY2Zsb3djaGFydF96cHM0ZThjNzhjOS5qcGc=/?ref=
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