Engine jerking/stuttering under acceleration

Ford Puma ST Chat
Fberlo
Posts: 5
Joined: Tue Apr 02, 2024 9:27 am

Post by Fberlo »

Hello all,

I have bought a used Puma ST from 2021, with 13k miles on the clock. Recently, the car has been stuttering/jerking under acceleration (heavy or light load, at highway cruising speed, happening once every 100-200 miles I would say, very randomly). Two-cylinder in eco/normal mode sometimes (3 times over 1000 miles) doesn't switch to 3 cylinder mode unless I downshift, but works normally otherwise.
No engine light or anything.
Cars runs great otherwise.
Maintenance with Oil change has been done twice since bought new, but owner's mechanic did not seem to change anything else other than that.

Question:
- could it be related to the sparkplugs? And Wouldn't I receive an EML in this case?
- Can't I just wait the next oil change next year to replace them?

I feel it's a bit unnecessary for it to go under maintenance once again, and changing plugs under 20k miles seems a bit hasty...

I would be very gratefull if anyone could advise me on this! Thanks !

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Rizmo
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Joined: Wed Sep 23, 2020 2:13 pm
Location: Peterlee, Co Durham

Post by Rizmo »

You might... see next post.
Last edited by Rizmo on Tue Apr 02, 2024 12:34 pm, edited 1 time in total.
Puma ST-Line-Vignale 155 manual, magnetic grey, DAP, electric tailgate. New in December 2021.
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Rizmo
Posts: 2546
Joined: Wed Sep 23, 2020 2:13 pm
Location: Peterlee, Co Durham

Post by Rizmo »

You might try for a diagnostic check which may reveal a fault code.
Puma ST-Line-Vignale 155 manual, magnetic grey, DAP, electric tailgate. New in December 2021.
DB74
Posts: 80
Joined: Thu May 04, 2023 3:36 pm
Location: Suffolk

Post by DB74 »

I thought the spark plugs should be changed on each service, but could be wrong.
Puma ST, Desert Island Blue with Driver Assistance Pack.
Hedgehog
Posts: 31
Joined: Wed May 24, 2023 10:52 am

Post by Hedgehog »

I had a conversation with the service department about spark plug changing. I was originally told that they get replaced every year/service but subsequently advised that it is in fact every two years/service on the dragon engine....
Did have: 2022.25 Puma ST (1.5 200PS), Grey Matter with DAP, PP, PT, PR
Now got: 2023.75 Puma ST (1.5 200PS), Azura Blue with DAP, PP, PT, PR + stonechip :(
DB74
Posts: 80
Joined: Thu May 04, 2023 3:36 pm
Location: Suffolk

Post by DB74 »

I've just checked the service schedule at https://www.ford.co.uk/support/service-intervals-check and it states renew spark plugs on 1st and 2nd service.
Puma ST, Desert Island Blue with Driver Assistance Pack.
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Sparks
Posts: 4281
Joined: Fri Aug 07, 2020 5:40 pm
Location: Warwickshire

Post by Sparks »

Fberlo wrote: ↑Tue Apr 02, 2024 9:43 am Hello all,

I have bought a used Puma ST from 2021, with 13k miles on the clock. Recently, the car has been stuttering/jerking under acceleration (heavy or light load, at highway cruising speed, happening once every 100-200 miles I would say, very randomly). Two-cylinder in eco/normal mode sometimes (3 times over 1000 miles) doesn't switch to 3 cylinder mode unless I downshift, but works normally otherwise.
No engine light or anything.
Cars runs great otherwise.
Maintenance with Oil change has been done twice since bought new, but owner's mechanic did not seem to change anything else other than that.

Question:
- could it be related to the sparkplugs? And Wouldn't I receive an EML in this case?
- Can't I just wait the next oil change next year to replace them?

I feel it's a bit unnecessary for it to go under maintenance once again, and changing plugs under 20k miles seems a bit hasty...

I would be very gratefull if anyone could advise me on this! Thanks !
Hi welcome to the forum. Where are you located?
Possible some dirty fuel has got into the tank.
I would say it's worth having it checked out.
Ford Puma ST-Line Vignale 155 Automatic.
Driver Assistance Pack. Power Tailgate etc. etc....Frozen White. 🚷🚳
Wireless Android Auto. 8-)
Previous Puma ST-Line X First Edition.
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Sparks
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Joined: Fri Aug 07, 2020 5:40 pm
Location: Warwickshire

Post by Sparks »

DB74 wrote: ↑Tue Apr 02, 2024 12:58 pm I've just checked the service schedule at https://www.ford.co.uk/support/service-intervals-check and it states renew spark plugs on 1st and 2nd service.
So, That'll be every two years then.
Ford Puma ST-Line Vignale 155 Automatic.
Driver Assistance Pack. Power Tailgate etc. etc....Frozen White. 🚷🚳
Wireless Android Auto. 8-)
Previous Puma ST-Line X First Edition.
DB74
Posts: 80
Joined: Thu May 04, 2023 3:36 pm
Location: Suffolk

Post by DB74 »

Sparks wrote: ↑Tue Apr 02, 2024 1:00 pm
DB74 wrote: ↑Tue Apr 02, 2024 12:58 pm I've just checked the service schedule at https://www.ford.co.uk/support/service-intervals-check and it states renew spark plugs on 1st and 2nd service.
So, That'll be every two years then.
Unfortunately not for the ST, which is every year.
Puma ST, Desert Island Blue with Driver Assistance Pack.
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Sparks
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Joined: Fri Aug 07, 2020 5:40 pm
Location: Warwickshire

Post by Sparks »

DB74 wrote: ↑Tue Apr 02, 2024 1:02 pm
Sparks wrote: ↑Tue Apr 02, 2024 1:00 pm
DB74 wrote: ↑Tue Apr 02, 2024 12:58 pm I've just checked the service schedule at https://www.ford.co.uk/support/service-intervals-check and it states renew spark plugs on 1st and 2nd service.
So, That'll be every two years then.
Unfortunately not for the ST, which is every year.
My bad, missed the ST bit, picked up the thread from active topics not section.....So, belay the last pipe.. :oops: :D .
Ford Puma ST-Line Vignale 155 Automatic.
Driver Assistance Pack. Power Tailgate etc. etc....Frozen White. 🚷🚳
Wireless Android Auto. 8-)
Previous Puma ST-Line X First Edition.
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