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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Juddering under accelerationViews : 2559 Replies : 20Users Viewing This Thread : |
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Feb 20th, 2021, 18:23 | #1 |
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Juddering under acceleration
So just got my C70 back from the garage and looks like it has a new problem ;'(
It has a lot of judder when under load accelerating which seems to calm down when you're coasting, it feels like the car is bouncing back and forth, almost like misfiring but I don't think it's that.. There's no engine light and spark plugs were renewed for genuine ones less than 5,000 miles ago. 2.4i petrol engine, manual gearbox. Any ideas?
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2009 S40 SE Lux 2.0i | 2022 Suzuki V-Strom 650 | 2002 Audi TT 225 Previous: C70 Coupe 2.4i | Saab 9-5 Aero | Daihatsu SporTrak |
Feb 20th, 2021, 19:32 | #2 |
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Motor mounts would be my first go to. Either top torque mount, or the lower dogleg torque mount typically go first. Side ones can fail but dont tend to result in rocking.
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1995 Volvo 850 T5 Estate (Manual) |
Feb 20th, 2021, 19:48 | #3 |
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Do you think maybe the garage could have not connected something back up when doing the anti roll bar bushes then?
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2009 S40 SE Lux 2.0i | 2022 Suzuki V-Strom 650 | 2002 Audi TT 225 Previous: C70 Coupe 2.4i | Saab 9-5 Aero | Daihatsu SporTrak |
Feb 20th, 2021, 20:36 | #4 |
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Anything in the back end would be more of a knocking or noticeable during cornering. If all is well when coasting then it's clearly tied to engine load, and hence not imo rear end.
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1995 Volvo 850 T5 Estate (Manual) |
Feb 20th, 2021, 21:34 | #5 |
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I'm talking about the front anti roll bar, part of the work they did was fitting new poly bushes for the front anti roll bar, they said they'd need to remove the entire anti roll bar to do this.
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2009 S40 SE Lux 2.0i | 2022 Suzuki V-Strom 650 | 2002 Audi TT 225 Previous: C70 Coupe 2.4i | Saab 9-5 Aero | Daihatsu SporTrak |
Feb 20th, 2021, 21:42 | #6 |
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I'm not sure if the anti roll bar bushes can be replaced without dropping the front subframe - I am assuming not as the bill would have been a lot more than what you paid. If so, there would be no need to touch the engine mounts to change the bushes. It must be the front bar bushes that were replaced as the rear bar doesn't have bushes.
I agree with Cookeh, most likely top engine mount or the dog bone tie rod under the engine/gearbox. easy to test: just give the engine a good rock back and forth and you will clearly see movement in the top mount. There are two bushes in the top mount - the main bush between the engine and arm and a smaller mount out of sight between the arm and scuttle. The black scuttle panel needs removing to see the mount. The dog bone tie rod can be seen once under the car - again easy to test with a prybar in the mount and rock the engine back and forth. There are three other mounts that might need replacing, but I would check the top mount and dog bone first.
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Feb 20th, 2021, 21:42 | #7 |
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Apologies. The jist of my reply still applies though. ARBs are a knocking noise and would be present at all times when going over undulations or bumps. To only occur under load it has to be linked to driveline.
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1995 Volvo 850 T5 Estate (Manual) |
Feb 20th, 2021, 22:25 | #8 | |
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Quote:
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Feb 20th, 2021, 22:50 | #9 |
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Edit to say: Both bushes on the top engine mount can be seen without any dismantling. The large one on top of the engine will be very obvious if collapsed, the smaller one between the arm and scuttle not quite so, but still clear to see. If this needs replacing - and I would recommend both if they are worn - the black scuttle panel needs removing to get to the mount bolts.
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2001 V40 2.0lt Sport Lux - Daily Driver. 178k miles. 2003 C70 2.4 GT Convertible - Garage Queen. 67k miles. http://www.neptuno6benagil.com |
Feb 20th, 2021, 22:57 | #10 | |
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Quote:
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2009 S40 SE Lux 2.0i | 2022 Suzuki V-Strom 650 | 2002 Audi TT 225 Previous: C70 Coupe 2.4i | Saab 9-5 Aero | Daihatsu SporTrak |
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c70, manual, petrol |
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