Car shutters and shakes under accelleration

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Car shutters and shakes under accelleration

Postby tvacc » Sat 08.09.2018, 22:58

Hello All,

Posting for a friend with an M100. Under acceleration, the car shutters and shakes. Stops on Deceleration. Only get it when you push on the gas pedal.


Any help appreciated/


Tony V
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Re: Car shutters and shakes under accelleration

Postby Simon_P » Sun 09.09.2018, 08:31

Sounds like the engine... Or the drive train.
Tony, a man of your experience posting so little information and hoping for a sensible answer... Really! :lol:

Try coil packs, they work in pairs so if it is failing under load it can take out 2 cylinders. Ease off and it goes back to 4.

Otherwise injectors for the same reason but luckily the pairing is different.
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Re: Car shutters and shakes under accelleration

Postby dapinky » Sun 09.09.2018, 10:09

As I'm not an electrical/EFI/diagnostic expert my first thought was "what is mechanical and can cause this?".....

.... so whilst Simons answer is far more likely to be correct than mine, I would offer things like engine mount(s), suspension bolts, (or any loose bolts!), driveshaft(s) or even something simple like a losse wheel/buckled alloy.
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Re: Car shutters and shakes under accelleration

Postby Rambo » Sun 09.09.2018, 14:04

My first thoughts were mechanical too. But there isn't much info to go on. If it is hit and miss under hard acceleration it could be the coil packs ????
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Re: Car shutters and shakes under accelleration

Postby alan e » Sun 09.09.2018, 14:19

Check the timing that wont cost you anything before you start changing parts and its always worth checking anyway.
Last edited by alan e on Sun 09.09.2018, 18:08, edited 1 time in total.
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Re: Car shutters and shakes under accelleration

Postby Brit-Car-Nut » Sun 09.09.2018, 17:17

Bad drive shaft CV Joints or bad bearings in the Center Shaft?

They will only go out of balance when being torqued, so not overly noticeable when testing in static mode or when jacked up.
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Re: Car shutters and shakes under accelleration

Postby Fredjohn » Sun 09.09.2018, 20:08

My first thought was also something mechanical.

I had a vibration under acceleration between 50 and 70 mph. As soon as I lifted and settled to a steady speed, the shudder reduced/stopped. Didn't happen on lift off or deceleration.


Checked front bearings, wheel balance and suspension locations but all OK. Eventually looked at driveshafts and the WSM: symptoms indicated inboard joints of driveshafts (as per WSM). So fitted new driveshafts and problem solved.

HOWEVER If this is your problem SJ Sports no longer have any in stock. There may be some elsewhere, but you may have to get yours rebuilt.

As stated above do basic checks of the electrics first, but my suspicions are with the driveshafts.
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Re: Car shutters and shakes under accelleration

Postby John_W » Sun 09.09.2018, 21:35

What do you mean by WSM?
:smt017 :smt102
It’s not aTLA I know.

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Re: Car shutters and shakes under accelleration

Postby Brit-Car-Nut » Sun 09.09.2018, 21:40

Work Shop Manual?
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Re: Car shutters and shakes under accelleration

Postby Fredjohn » Sun 09.09.2018, 22:16

Brit-Car-Nut wrote:Work Shop Manual?


I thought most people on here used this acronym.

CDM awarded to BCN for correct answer. If you can still buy it in USA.
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Re: Car shutters and shakes under accelleration

Postby sideways » Sun 09.09.2018, 22:30

Since we are flinging things out there - and based on the lack of info - possibly clutch.

Some more symptoms would help.
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Re: Car shutters and shakes under accelleration

Postby Brit-Car-Nut » Sun 09.09.2018, 23:18

Fredjohn wrote:
Brit-Car-Nut wrote:Work Shop Manual?


I thought most people on here used this acronym.

CDM awarded to BCN for correct answer. If you can still buy it in USA.

I am assuming CDM is Car and Driver Magazine (yep, it is still available over here), but I prefer Cult of the Dead Moron.
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Re: Car shutters and shakes under accelleration

Postby Fredjohn » Mon 10.09.2018, 00:05

Brit-Car-Nut wrote:
Fredjohn wrote:
Brit-Car-Nut wrote:Work Shop Manual?


I thought most people on here used this acronym.

CDM awarded to BCN for correct answer. If you can still buy it in USA.

I am assuming CDM is Car and Driver Magazine (yep, it is still available over here), but I prefer Cult of the Dead Moron.


:D :D Two countries separated by a common language!

Cadbury's Dairy Milk!!!

Chocolate in other words, but owned by a US company: Kraft Foods (or whatever they're now called)
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Re: Car shutters and shakes under accelleration

Postby Simon_P » Mon 10.09.2018, 00:58

My first thought was was mechanical too, but I read through the non existent lines :wink: and deduced that Tony would have worked through the "usual" things and was looking for an M100 specific answer.
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Re: Car shutters and shakes under accelleration

Postby tvacc » Mon 10.09.2018, 02:44

Thanks for the ideas guys. I am only relaying what my friend told me. I have not seen the car yet.

I am hoping for the coil packs. Not hoping for the CVs.

Will let you all know.

Tony V
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Re: Car shutters and shakes under accelleration

Postby GeoffSmith » Mon 10.09.2018, 11:35

John_W wrote:What do you mean by WSM?
:smt017 :smt102
It’s not aTLA I know.

John

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