100 Series jerking motion

Could be that. I have an 80 series with a 1hz. I think it may be the slack in the diffs. Hoping to get the diffs rebuilt and locked by next year, hopefully that'll fix it.

blocked fuel filter

Kimbos
Most/nearly all lift kits in Mazdas make them shudder and vibe if there is no attention paid to the resulting alteration in tailshaft uni drive angles. Nor revelation from the tech there.

Seeing you have mentioned lifted vehicles, is yours lifted? If so how much and did the fitters ATTEND to the uni angles or ignore them as is usually done.

The tailshaft doesn't load up the uni joints but does make then try and oscillate radially as they spin. That is felt as a shuddddder or a vibe or both.

If you can accelerate and power away it possibly isn't a fuel filter issue as more power requires more fuel, and a blocked filter can't supply it.

The frequency of the jerking might be a key if you can ID it a little more. ie always locked to road speed?

Cheers
Ross M

Kimbos,

Check the trailing arm bushes in the back. If they are worn they will cause a jerking sensation while coasting and go away while acceleration. The back diff is moving about.


Wayne

My 80 does the same thing occasionally, it mostly plays up after a run out along the road and then its when I slow down to cruise through a town the problem occurs, like others it happens around that coast/slight throttle position

Trevor

Hi Kimbos,
you may also get some more info from lcool.org You will have to join up first (free) and they also are generally a helpful mob. Best of luck with your diagnosis

Nev

'100 Series jerking motion'

I'd check the driver.