Juddering

[milissa]

Hi sorry but looking for some advice.

I own a yaris 1.3 06 plate which has been great. Just got a new clutch put in but now the car has started juddering/ bunny hopping at 33 mph when warm. 

Any ideas?

Not showing any faults.

[Max_Headroom]

If it didn't do it before the new clutch was fitted its a good bet they have done something wrong when fitting it. 

[Mooly]

Hard to diagnose at a distance...

If the clutch is fully releasing (meaning that it is not slipping and grabbing) then it sounds unrelated to a clutch fault but may be a consequence of the work done although quite what I can't imagine.

Any warning lights on related to the engine management?

You need to be sure its not slipping first. If you accelerate hard in third or fourth gear with the pedal released there should be no tendency for the engine revs to rise in an out of step way to the road speed. If the revs rise and the road speed doesn't increase then it is slipping.  

 

[flash22]

Manual or semi-auto ? 30-35 mph what gear are you in, you may be changing up too early, the clutch will be a bitey until it beds in, use a bit more rpm before changing up

 

[milissa]

16 minutes ago, Max_Headroom said:

If it didn't do it before the new clutch was fitted its a good bet they have done something wrong when fitting it. 

Had the clutch checked at the garage. No problems with the clutch.

[milissa]

16 minutes ago, Mooly said:

Hard to diagnose at a distance...

If the clutch is fully releasing (meaning that it is not slipping and grabbing) then it sounds unrelated to a clutch fault but may be a consequence of the work done although quite what I can't imagine.

Any warning lights on related to the engine management?

You need to be sure its not slipping first. If you accelerate hard in third or fourth gear with the pedal released there should be no tendency for the engine revs to rise in an out of step way to the road speed. If the revs rise and the road speed doesn't increase then it is slipping.  

 

No lights showing. 

[bathtub tom]

33 minutes ago, milissa said:

Had the clutch checked at the garage. No problems with the clutch.

If it was checked at the garage that replaced the clutch, then to misquote Mandy Rice-Davis, "they would say that, wouldn't they".

[Max_Headroom]

3 hours ago, bathtub tom said:

If it was checked at the garage that replaced the clutch, then to misquote Mandy Rice-Davis, "they would say that, wouldn't they".

You beat me to it.  😉

[Mooly]

5 hours ago, milissa said:

Had the clutch checked at the garage. No problems with the clutch.

 

5 hours ago, milissa said:

No lights showing. 

I think you are going to need a second diagnosis then, and from a different place than fitted the clutch. If it didn't do this before and now it does... that's a bit to much of a coincidence in my book. 

5 hours ago, milissa said:

Had the clutch checked at the garage. No problems with the clutch.

Did they offer any suggestion as to the problem then? Any place worth its reputation should at least give you an idea of what may be wrong (imo).

Do keep us updated, it will be interesting to know the outcome. And good luck 🙂

   

[Derek.w]

Is it just a light judering with aircon on going up a steep hill change down a gear increase revs turn off aircon if going up a steep hill and lets say stopping then pulling away and turning right/left.

It may help.

[Saxmaniac]

I might be talking rubbish but could it be something like engine mount loose? They probably were disturbed while changing clutch 

[milissa]

13 hours ago, Mooly said:

 

I think you are going to need a second diagnosis then, and from a different place than fitted the clutch. If it didn't do this before and now it does... that's a bit to much of a coincidence in my book. 

Did they offer any suggestion as to the problem then? Any place worth its reputation should at least give you an idea of what may be wrong (imo).

Do keep us updated, it will be interesting to know the outcome. And good luck 🙂

   

Had the clutch checked at a different garage. Who said it doesn't seem related.

They cleaned the throttle body but hasn't stopped the problem. 

Had ran the car low on petrol before the clutch then filled it up and the issue started about 20 miles after. 

[corradovr6]

when stationary, does it rev cleanly to say 4000 rpm?  Take the spark plugs out and have a look at them - post up some pics and we can comment accordingly.  My thoughts are along a misfire, or poor fuel/fuel delivery.  The E10 fuel is not that good (in my experience), i've been using an additive with it in my car.

Might also be worth running a fuel injector cleaner through as well.

[Gray86]

Our 2015 1.33 has juddered a bit since we had it 2yrs / 10,000 miles now 8 years old 41,000 miles. Still doing it. I think it’s possibly a ‘feature’ of the sensitive drive by wire throttle. Only does it on light throttle. 

[Knorton]

7 hours ago, Gray86 said:

Our 2015 1.33 has juddered a bit since we had it 2yrs / 10,000 miles now 8 years old 41,000 miles. Still doing it. I think it’s possibly a ‘feature’ of the sensitive drive by wire throttle. Only does it on light throttle. 

That rings a bell. Had a 2002 Berlingo 2.0HDI that acted like a novice driver/Kangaroo diesel when not quite warm had 2 citroen modified engine maps downloaded by main deal to cure this but never totally eradicated it! Eventually succumbed to random Citroen/Peugeot electrical gremlins at around 175,000 miles.

[TonyHSD]

On 4/8/2023 at 9:57 AM, milissa said:

Had the clutch checked at a different garage. Who said it doesn't seem related.

They cleaned the throttle body but hasn't stopped the problem. 

Had ran the car low on petrol before the clutch then filled it up and the issue started about 20 miles after. 

When they cleaned the throttle body did they disconnect the 12v Battery? Did the clutch mechanics disconnect that Battery either? 
The car may fix itself with the time but meanwhile you can use some E5 99 premium petrol , add injector cleaner and do a motorway run for at least 30 min at constant speed. See how it goes. 

[Starensis]

Clutches normally do that when the clutch plate isn’t aligned correctly to pressure plate/flywheel. When rotating under drive - they’re off centre and cause juddering.

[Max_Headroom]

On 4/7/2023 at 1:54 PM, milissa said:

Just got a new clutch put in but now the car has started juddering/ bunny hopping at 33 mph when warm. 

Does it do it from cold or only when its warmed up?

[Stivino]

49 minutes ago, Starensis said:

Clutches normally do that when the clutch plate isn’t aligned correctly to pressure plate/flywheel. When rotating under drive - they’re off centre and cause juddering.

That's impossible. 

Once the gearbox is in, the disc has to be central on the shaft.  Therefore, it can't be out of alignment.

[TonyHSD]

6 hours ago, Stivino said:

That's impossible. 

Once the gearbox is in, the disc has to be central on the shaft.  Therefore, it can't be out of alignment.

It is possible and happens often in modern cars. Some manufacturers has a specific tools for proper installation of clutch assembly and if this tool not been used will cause exactly that issue. 

[Max_Headroom]

3 hours ago, TonyHSD said:

It is possible and happens often in modern cars

I remember many years ago I had a clutch replaced and the guy used a tool to centre it. 

 

 

[Stivino]

Whenever I replaced a gearbox, I used to remove the 1st motion shaft, burn/cut the end off it, and keep it in my toolbox for future use.

[Guest]

1 hour ago, Stivino said:

Whenever I replaced a gearbox, I used to remove the 1st motion shaft, burn/cut the end off it, and keep it in my toolbox for future use.

Like this? Also that alignment tool is excellent. Aligning is completed on the bench before going near the rengine.

I have only done it once, successfully, not recommended , to line it up by eye and measuring to place the friction plate central when loosely bolted to the flywheel.

I would expect it virtually impossible for the g/box input shaft to enter the fiction plate without damage.