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Acceleration Rattle (Solved)

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dmachura
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Acceleration Rattle (Solved)

Postby dmachura » 10 Aug 2018 15:18

Hi; I was wondering if anyone would know what would cause a rather loud rattle when accelerating from stop. It only occurs during a low speed acceleration and disappears while driving, it also intermittantly occurs during low speed deceleration. Sound seems to come from underneath passenger seat.
Thanks
Last edited by dmachura on 30 Aug 2018 21:01, edited 1 time in total.

FI Spyder
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Re: Acceleration Rattle

Postby FI Spyder » 10 Aug 2018 15:40

Not exactly the same but a thought. I had a rattle coming from the car at low speeds on rougher roads but it was intermittent , it seemed to come from the left hand side but that's the drivers side so I couldn't be sure. Also seemed more pronounced if there was something to bounce the sound back like bushes or cement pilon (which makes sense). Turned out that it was a nut and washer from the cat cage had come off (I guess I didn't tighten it enough when I was last working on that. It was sitting on the cat cage and with right frequency would rattle. I would check exhaust fastenings as sound can bounce and it's easy to be misdirected.
- - -TR7 Spider - - - 1978 Spitfire- - - - 1976 Spitfire - - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra - Yellow TCT

busheytrader
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Re: Acceleration Rattle

Postby busheytrader » 10 Aug 2018 22:40

+1 on the exhaust.

The original gearstick remote housing bushes disintegrate with age. The housing can move around and drop on to the rotating propshaft underneath. If the gearstick can be moved up and down the bushes will need replacing.

The perceived direction of noises can be misleading at times. I chased the cause of a vibration from the rear end for months. Replacing a slightly rough front wheel bearing cured it.

Hope this helps

dmachura
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Re: Acceleration Rattle (Solved)

Postby dmachura » 30 Aug 2018 21:22

Hi;
I finally had a chance to get under her today to have a look. I checked the exhaust and the gear shifter everything seemed tight; except the drive shaft, there was a little play in it and since I just so happen to have a spare one I changed it. Rattle now gone. However the drive shaft I had was different than the one on the car. I removed the spare from a tr7 that I thought was the same year (1980 DHC). Top one in picture it looks like it has some sort of vibration damping whereas the spare looks like conventional universal joints. Anyone know which one is older?

Next rattle is the steering column anyone got quick (and easy) fix for replacing the firewall bushing......
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shafts (2).jpg
shafts (2).jpg (127.02 KiB) Viewed 222 times

saabfast
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Re: Acceleration Rattle (Solved)

Postby saabfast » 30 Aug 2018 22:36

Top one looks standard with CV joints. Not sure about the bottom one, looks like its made up with standard UJ's.
Alan
Saab 9-5 2.3t Vector Auto Estate Stage 1
Saab 9-3 2.0 SE Turbo Convertible
'81 TR7 DHC
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busheytrader
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Re: Acceleration Rattle (Solved)

Postby busheytrader » 30 Aug 2018 23:25

For replacing the steering bulkhead bush..........

viewtopic.php?f=2&t=18628&p=228886&hilit=Steering+polybush#p228886

I collapsed the steering column from under the footwell.

Beans
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Re: Acceleration Rattle (Solved)

Postby Beans » 31 Aug 2018 14:35

dmachura wrote: ... Anyone know which one is older? ...

The bottom one is the newer one. And it has the correct length ...
See this post from my blog https://tr7beans.blogspot.com/2012/06/more-prop-shaft-woes.html
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1976 TR7 FHC (currently being restored ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng)

http://www.tr7beans.blogspot.com/

dmachura
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Re: Acceleration Rattle (Solved)

Postby dmachura » 31 Aug 2018 20:05

Thanks for the links! Ordered bushing today...

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