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924_Forza
Joined: 19 Dec 2014
Posts: 42
Location: Washington, DC
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 Posted: Tue Mar 01, 2016 2:55 am Post subject: Bucking 924S |
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Hello all,
I appreciate the help that people on the 924 Board has given me. My 924S experience won't be nearly as good.
I do have another question.
My 924S bucks taking off from a stand still. It usually happens when I'm a little slow on the throttle coming off the clutch. When I punch the throttle coming off the clutch, it doesn't do it. But, when one is going over speed bumps it is hard to really give it the full beans coming off the clutch.
The bucking can be rather violent. When bucking, the car's weight seems to uncontrollably bounce from rear to front to rear. It doesn't stop until I completely take my foot off the gas. I have owned many 944's and I never had this problem. (The 924S is quite awesome by the way. I like it better than a N/A 944.) It makes speed bumps a bit difficult.
Does anyone have an idea of what this is? FYI, I recently replace the engine mounts.
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Michael Simms
1987 924S
1988 951 |
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edredas
Joined: 09 Dec 2004
Posts: 861
Location: Charlotte, NC
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| Posted: Tue Mar 01, 2016 3:56 am Post subject: |
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Sounds like the TPS might be either bad or out of adjustment. Try unplugging it to see if the issue goes away. Your idle will be higher with it unplugged but if it alleviates the bucking then you can go from there.
I hope that helps!
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'84 944 -White, Brown interior
'84 944 -Red, Automatic
'86 944 -Garnet, Fully loaded, Koni suspension
'87 924S -Red, 300hp 951 swap
'87 924S -Red, Project Car
'88 924S -Red, Daily Driver |
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924_Forza
Joined: 19 Dec 2014
Posts: 42
Location: Washington, DC
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| Posted: Tue Mar 01, 2016 4:15 am Post subject: |
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| edredas wrote: | Sounds like the TPS might be either bad or out of adjustment. Try unplugging it to see if the issue goes away. Your idle will be higher with it unplugged but if it alleviates the bucking then you can go from there.
I hope that helps! |
Thanks! I will try it.
Could it also be a Throttle Cable being out of adjustment?
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Michael Simms
1987 924S
1988 951 |
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edredas
Joined: 09 Dec 2004
Posts: 861
Location: Charlotte, NC
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| Posted: Tue Mar 01, 2016 4:24 am Post subject: |
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I would think that the throttle cable would have to be really far out of adjustment to cause that. You would likely see a huge amount of slack in the cable when you popped the hood.
To further clarify, is the engine responsive when this happens or does the driveline has feel like it has slack?
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'84 944 -White, Brown interior
'84 944 -Red, Automatic
'86 944 -Garnet, Fully loaded, Koni suspension
'87 924S -Red, 300hp 951 swap
'87 924S -Red, Project Car
'88 924S -Red, Daily Driver |
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924_Forza
Joined: 19 Dec 2014
Posts: 42
Location: Washington, DC
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| Posted: Tue Mar 01, 2016 4:28 am Post subject: |
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| edredas wrote: | I would think that the throttle cable would have to be really far out of adjustment to cause that. You would likely see a huge amount of slack in the cable when you popped the hood.
To further clarify, is the engine responsive when this happens or does the driveline has feel like it has slack? |
It seems pretty responsive.
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Michael Simms
1987 924S
1988 951 |
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edredas
Joined: 09 Dec 2004
Posts: 861
Location: Charlotte, NC
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| Posted: Tue Mar 01, 2016 4:37 am Post subject: |
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In that case, the rubber centered clutch may have broken and you are driving on the limp tabs. When that happens you have to ease on the clutch until the tabs catch and if you lift off it can cause bucking because the tabs come apart, disconnecting the engine from the transmission.
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'84 944 -White, Brown interior
'84 944 -Red, Automatic
'86 944 -Garnet, Fully loaded, Koni suspension
'87 924S -Red, 300hp 951 swap
'87 924S -Red, Project Car
'88 924S -Red, Daily Driver |
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924_Forza
Joined: 19 Dec 2014
Posts: 42
Location: Washington, DC
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| Posted: Tue Mar 01, 2016 4:44 am Post subject: |
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| edredas wrote: | | In that case, the rubber centered clutch may have broken and you are driving on the limp tabs. When that happens you have to ease on the clutch until the tabs catch and if you lift off it can cause bucking because the tabs come apart, disconnecting the engine from the transmission. |
I was afraid that was the problem. It behave like this is the problem. I could try the TPS first.
I don't know if the clutch was replaced prior to buying it. The owner said it was, but the records showed it done quite a well ago by a Porsche dealer.
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Michael Simms
1987 924S
1988 951 |
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edredas
Joined: 09 Dec 2004
Posts: 861
Location: Charlotte, NC
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| Posted: Tue Mar 01, 2016 4:48 am Post subject: |
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Good Luck! Maybe someone here will have experienced this exact issue and be able to help you better. I would have it checked by a mechanic since it's almost impossible to diagnose symptoms without actually driving a car.
I hope it turns out to be something simple!
_________________
'84 944 -White, Brown interior
'84 944 -Red, Automatic
'86 944 -Garnet, Fully loaded, Koni suspension
'87 924S -Red, 300hp 951 swap
'87 924S -Red, Project Car
'88 924S -Red, Daily Driver |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Tue Mar 01, 2016 5:53 am Post subject: |
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You might check motor mounts as well.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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