100 Series jerking motion

Submitted: Friday, Mar 28, 2014 at 21:57
ThreadID: 106961 Views:2619 Replies:7 FollowUps:13
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Hi all, can anyone suggest what might be the problem. Usually while accelerator is at coasting or slight acceleration in any gear this happens, if you put your foot down more it usually goes away. It’s a lot like being in the wrong gear but you are not. I’m thinking engine mount or transmission mount.
A Mazda tech was telling me they put a lift kit on a BT50 and it did the same thing, being the tail shaft loading up the universal joint because it wasn’t In line with the gearbox anymore.
What do you think???
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Reply By: Member - ironJosh - Friday, Mar 28, 2014 at 22:17

Friday, Mar 28, 2014 at 22:17
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.
AnswerID: 529350

Follow Up By: Kimbos - Saturday, Mar 29, 2014 at 00:48

Saturday, Mar 29, 2014 at 00:48
Thanks IronJosh, I had a 80 GXL myself that did the same thing.
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Reply By: get outmore - Friday, Mar 28, 2014 at 22:50

Friday, Mar 28, 2014 at 22:50
blocked fuel filter
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Follow Up By: Kimbos - Saturday, Mar 29, 2014 at 00:44

Saturday, Mar 29, 2014 at 00:44
Thanks mate, but no its not filters. I think a lot of GXL's have the same prob being fulltime 4x4's. some more than others.
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Follow Up By: Member - ironJosh - Saturday, Mar 29, 2014 at 08:00

Saturday, Mar 29, 2014 at 08:00
I'm hoping a part-time 4wd kit will also help this problem.

Josh
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Follow Up By: Member - Keith C (NSW) - Saturday, Mar 29, 2014 at 16:42

Saturday, Mar 29, 2014 at 16:42
Josh, Pt time fwd kit fixed that problem in my 80s.It's driveline backlash on balanced throttle. Make sure you get the heavy duty kit.Mine is AVM.
It made the car much better, steering is more direct, very nice to drive now, only downside is more rear tyre chipping when towing the van on very stony tracks, eg Oodnatta to Mt Dare, upside,no chipping on fronts.
Regards Keith
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Follow Up By: Member - ironJosh - Saturday, Mar 29, 2014 at 17:12

Saturday, Mar 29, 2014 at 17:12
Thanks Keith- It's great to know these things.

Josh
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Reply By: Ross M - Saturday, Mar 29, 2014 at 00:02

Saturday, Mar 29, 2014 at 00:02
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
AnswerID: 529356

Follow Up By: get outmore - Saturday, Mar 29, 2014 at 00:10

Saturday, Mar 29, 2014 at 00:10
Ive just been going through this exact thing with my troopy after some bad fuel.
Symptoms are exactly the same. But go away after changing the primary filter.
When it was at its worst it was also breaking down at high revs.
Besides that yes you can power up and symptoms go away
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Follow Up By: Kimbos - Saturday, Mar 29, 2014 at 01:04

Saturday, Mar 29, 2014 at 01:04
Thanks Ross, Its not really a shudder as such, its more like a broken engine mount, in which the whole engine would rock back n forth until it picks up speed. But it not that. It only really happens when you apply a little acceleration while cruising along. Not under load. Put your foot into her and it doesn't do it. However you will always get to a point where you coast along and give little acceleration, back off, little acceleration, and that's when it does it.

Cheers mate.
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Follow Up By: Ross M - Saturday, Mar 29, 2014 at 09:37

Saturday, Mar 29, 2014 at 09:37
Because of it happening like that it is more like what gom has mentioned.
Won't be driveline then and as he said more likely in the fuel area.

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Follow Up By: get outmore - Saturday, Mar 29, 2014 at 10:47

Saturday, Mar 29, 2014 at 10:47
thats just my experience - im assuming youve got a 1hz?

if so nothing to lose and changing the fuel filter is a 5 minute job.

easiest way to do it is to take out the 2 bolts holding the filter assembly and invert the filter so it sticks up and bolt it back

then whisk it off and the new one on - you may need a filter wrench
then put the filter assembley back the rigght way and reatach the hoses and prime it

it may muck around a bit after restarting and if its too rough them prime it some more but it should quickly smooth out
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Follow Up By: Bob Y. - Qld - Monday, Mar 31, 2014 at 09:34

Monday, Mar 31, 2014 at 09:34
We had symptom similar to this in a '90 model 80 series, with 1HD-T motor.

Had injector pump rebuilt, and it was a rocket after that!

Bob.

Seen it all, Done it all.
Can't remember most of it.

Lifetime Member
My Profile  My Blog  My Position  Send Message

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Reply By: Wayne NSW - Saturday, Mar 29, 2014 at 08:12

Saturday, Mar 29, 2014 at 08:12
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
AnswerID: 529359

Follow Up By: Kimbos - Saturday, Mar 29, 2014 at 17:40

Saturday, Mar 29, 2014 at 17:40
Thanks Wayne, I shall check this out and let you know.
Cheers Mate!
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Reply By: Trev6 - Saturday, Mar 29, 2014 at 09:11

Saturday, Mar 29, 2014 at 09:11
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
AnswerID: 529360

Follow Up By: Kimbos - Saturday, Mar 29, 2014 at 17:39

Saturday, Mar 29, 2014 at 17:39
Hi Trev6, yep you know what Im on about mate. I think its backlash and might be a common problem with manual GXL's. never heard of it in Auto's.
Thanks mate!
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Reply By: Nev (TAS) - Saturday, Mar 29, 2014 at 11:03

Saturday, Mar 29, 2014 at 11:03
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
AnswerID: 529368

Reply By: Echucan Bob - Saturday, Mar 29, 2014 at 23:50

Saturday, Mar 29, 2014 at 23:50
'100 Series jerking motion'

I'd check the driver.
AnswerID: 529410

Follow Up By: Kimbos - Monday, Mar 31, 2014 at 18:00

Monday, Mar 31, 2014 at 18:00
Thanks Bob I'll keep my hand off it in future. By the way Mate I was told you should sell that little Suzuki Jimmy of yours and get a real mans car!

Best of luck in your quest!!!!
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