 Bouncing car, Car bounces when slowing down |
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| gaocs |
 Jul 13 2019, 09:27 AM
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#1
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Newbie  Group: Members Posts: 15 Joined: 22-April 16 From: London Member No.: 19,924 Region Association: None  |
I have a really odd thing happing in my car that I hope someone can help with.
About two years ago I had new shocks fitted all round to my 1970 1.7 and since then the car has had an unusual symptom where it "bounces" up and down as you are going along... but it doesn't happen all the time. It always happens when I have been driving at say 50mph+ and then have to slow down, the car then continually bounces up and down as it's going along, especially at slow speeds. This always happens for example when I'm on a motorway and then the traffic slows right down and is then start-stop traffic. It feels like you are on a trampoline. I always thought it was more of a "seat of the pants" feel, but today my son was driving behind me and he says you can visibly see the car bouncing up and down. I've had the suspension checked and everything seems ok, so does anyone have any ideas as to what can be causing this? Could it be engine mounts or something else? The wheels are new as are the tyres so it's not a problem related to them not being round. The "bounce" is a few inches of movement up and down. Thanks. |
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| dr914@autoatlanta.com |
Jul 13 2019, 11:44 AM
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#2
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914 Guru Group: Members Posts: 8,187 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
maybe a knot in one of the tires, and or a broken steel band? Also an out of round tire can cause it. MANY MANY times when we take these 914s our of our display area after sitting for several years they bounce up and down as they travel down the road. The tires have become flat spotted from sitting
QUOTE(gaocs @ Jul 13 2019, 08:27 AM)  I have a really odd thing happing in my car that I hope someone can help with. About two years ago I had new shocks fitted all round to my 1970 1.7 and since then the car has had an unusual symptom where it "bounces" up and down as you are going along... but it doesn't happen all the time. It always happens when I have been driving at say 50mph+ and then have to slow down, the car then continually bounces up and down as it's going along, especially at slow speeds. This always happens for example when I'm on a motorway and then the traffic slows right down and is then start-stop traffic. It feels like you are on a trampoline. I always thought it was more of a "seat of the pants" feel, but today my son was driving behind me and he says you can visibly see the car bouncing up and down. I've had the suspension checked and everything seems ok, so does anyone have any ideas as to what can be causing this? Could it be engine mounts or something else? The wheels are new as are the tyres so it's not a problem related to them not being round. The "bounce" is a few inches of movement up and down. Thanks. |
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Posts in this topic
gaocs Bouncing car Jul 13 2019, 09:27 AM
Superhawk996 I agree with the Doctor that the tires are the mos... Jul 13 2019, 12:42 PM Superhawk996 One other obvious item comes to mind.
914 rear ... Jul 13 2019, 01:02 PM Superhawk996 I keep re-reading your OP. You say you had the su... Jul 13 2019, 01:20 PM SirAndy Is the car lowered a lot? It could be riding on th... Jul 13 2019, 01:33 PM dan10101 I never assume because one person told you that so... Jul 13 2019, 02:11 PM
IronHillRestorations Is the brake pedal pulsating? I think it’s prob... Jul 13 2019, 02:16 PM |
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