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Kirkham Motorsports

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  • 1 Post By mrmustang
  • 3 Post By jhv48

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  #1 (permalink)  
Old 01-17-2021, 11:27 AM
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Default Banging noise when getting off acceleration

I have a Superformance Cobra with 351W and Tremec 5 speed. When I accelerate a little hard and then lift off the accelerator I get a huge banging/knocking from what sounds to be right behind me. I have check every bolt even removed the sway bar which made the problem worse. If I drive in a normal stuck in traffic manner it does not do it. Hoping someone else has had this issue with an SP before. Any suggestions appreciated? Also looking for troubleshooting methods.
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Old 01-17-2021, 11:33 AM
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Quote:
Originally Posted by Voipman View Post
I have a Superformance Cobra with 351W and Tremec 5 speed. When I accelerate a little hard and then lift off the accelerator I get a huge banging/knocking from what sounds to be right behind me. I have check every bolt even removed the sway bar which made the problem worse. If I drive in a normal stuck in traffic manner it does not do it. Hoping someone else has had this issue with an SP before. Any suggestions appreciated? Also looking for troubleshooting methods.
Have you checked your rear shock mounts?
Early cars had known issues with the upper shock mounts.
Also check your rear differential mounts.


Bill S.
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Old 01-17-2021, 11:39 AM
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Default Noise

I would check your u joint bolts and play in the u joint....
Jon
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Old 01-17-2021, 12:10 PM
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Quote:
Originally Posted by mrmustang View Post
Have you checked your rear shock mounts?
Early cars had known issues with the upper shock mounts.
Also check your rear differential mounts.


Bill S.
Def look at the diff mounts, some early cars have had the brackets tear out of the frame. The bolts can be tight but what they attach to isn't!
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Old 01-18-2021, 07:24 AM
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I can send you the service bulletin on the shock mounts. Send me an email.
Blas
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Old 01-18-2021, 08:05 AM
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I can send you the service bulletin on the shock mounts. Send me an email.
Blas
Blas,

He can CLICK HERE as well, as the original 2008 bulletin is still available.

Hope all is well with you and yours.

Bill S.
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Old 01-18-2021, 08:47 PM
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Voipman welcome to the forum


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Old 01-19-2021, 09:02 AM
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I had the same banging noise when Iím hard on the accelerator.
Turns out it was my wifeís foot hammering on her imaginary brake pedal.
Blacklemming, MKS427 and mabbott74 like this.
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Old 01-19-2021, 11:59 AM
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My email is tullyc@is-talk.com

Thanks
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Old 01-19-2021, 04:08 PM
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As bad as the roads have gotten in The Ham, there's no telling what could be broken.

Different question,, Have you ever driven through Bankhead Forest?
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Old 01-19-2021, 05:40 PM
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Quote:
Originally Posted by saltshaker View Post
I would check your u joint bolts and play in the u joint....
Jon
This ^^ in addition to the other advice given above. I had a similar issue a while back and I found that the bolts in my driveshaft to differential flange were alarmingly loose.
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Old 01-19-2021, 05:41 PM
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Quote:
Originally Posted by jhv48 View Post
i had the same banging noise when iím hard on the accelerator.
Turns out it was my wifeís foot hammering on her imaginary brake pedal.
:lol::lol:
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Old 01-19-2021, 07:49 PM
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Default Diff mounting bolt

I had this bolt behind the diff break at the threads. I hope this helps.
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Old 01-19-2021, 09:12 PM
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Originally Posted by Peter Sitkowski View Post
I had this bolt behind the diff break at the threads. I hope this helps.
I had the same issue. I bought a bolt that had the threads that past the bracket, then added a washer and lock washer. Never an issue again.
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Old 01-20-2021, 06:49 PM
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Rear axle nuts?
Can you be more specific on the noise and what conditions cause it? Hard acceleration, chugging at low speed, hard shift?
Blas
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Old 01-21-2021, 09:57 AM
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Quote:
Originally Posted by jhv48 View Post
I had the same banging noise when Iím hard on the accelerator.
Turns out it was my wifeís foot hammering on her imaginary brake pedal.
I have the same problem. I found, if I don't let off the throttle a don't hear it, but I can still see the gestures. LOL
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