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 5Likes
01-17-2021, 11:27 AM
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CC Member
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Join Date: Jan 2021
Location: Birmingham,
AL
Cobra Make, Engine: Superformance Cobra #229
Posts: 3
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Not Ranked
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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01-17-2021, 11:33 AM
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CC Member/Contributor
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Join Date: Feb 2000
Location: Greenville,
SC
Cobra Make, Engine: 70 Shelby convertible, ERA-289 FIA, 65 Sunbeam Tiger, mystery Ford powered 2dr convertible
Posts: 12,687
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Not Ranked
Quote:
Originally Posted by Voipman
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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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.
__________________
Instead of being part of the problem, be part of a successful solution.
First time Cobra buyers-READ THIS
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01-17-2021, 11:39 AM
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CC Member
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Join Date: Sep 2007
Location: Marlboro,
NJ
Cobra Make, Engine: Contemporary Cobra
Posts: 921
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Not Ranked
Noise
I would check your u joint bolts and play in the u joint....
Jon
__________________
The Impossible Only Takes A Little Longer
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01-17-2021, 12:10 PM
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Senile Club Cobra Member
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Join Date: Feb 2001
Location: Buffalo, NY USA,
NY
Cobra Make, Engine: Superformance
Posts: 4,527
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Not Ranked
Quote:
Originally Posted by mrmustang
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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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! |
01-18-2021, 07:24 AM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,404
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Not Ranked
I can send you the service bulletin on the shock mounts. Send me an email.
Blas
__________________
Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, Cinema Tribute Cars $ GT40’s..
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net
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01-18-2021, 08:05 AM
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CC Member/Contributor
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Join Date: Feb 2000
Location: Greenville,
SC
Cobra Make, Engine: 70 Shelby convertible, ERA-289 FIA, 65 Sunbeam Tiger, mystery Ford powered 2dr convertible
Posts: 12,687
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Not Ranked
Quote:
Originally Posted by Blas
I can send you the service bulletin on the shock mounts. Send me an email.
Blas
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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.
__________________
Instead of being part of the problem, be part of a successful solution.
First time Cobra buyers-READ THIS
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01-18-2021, 08:47 PM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
Voipman welcome to the forum
Dwight
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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01-19-2021, 09:02 AM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
I had the same banging noise when I’m hard on the accelerator.
Turns out it was my wife’s foot hammering on her imaginary brake pedal.
__________________
Jim
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01-19-2021, 11:59 AM
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CC Member
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Join Date: Jan 2021
Location: Birmingham,
AL
Cobra Make, Engine: Superformance Cobra #229
Posts: 3
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Not Ranked
My email is tullyc@is-talk.com
Thanks |
01-19-2021, 04:08 PM
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CC Member
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Join Date: Nov 2018
Location: Priceville,
al
Cobra Make, Engine: Unique FIA
Posts: 334
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Not Ranked
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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01-19-2021, 05:40 PM
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CC Member
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Join Date: Feb 2000
Location: St. Lucia, West Indies,
WI
Cobra Make, Engine: Unique 427SC 383 stroker
Posts: 3,765
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Not Ranked
Quote:
Originally Posted by saltshaker
I would check your u joint bolts and play in the u joint....
Jon
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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.
__________________
Tropical Buzz
Grant me the serenity to accept the things I cannot change, the strength to change the things I can, and the wisdom to know the difference. -(wasn't me)
BEWARE OF THE DOGma!! Dogmatism bites...
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01-19-2021, 05:41 PM
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CC Member
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Join Date: Feb 2000
Location: St. Lucia, West Indies,
WI
Cobra Make, Engine: Unique 427SC 383 stroker
Posts: 3,765
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Not Ranked
Quote:
Originally Posted by jhv48
i had the same banging noise when i’m hard on the accelerator.
Turns out it was my wife’s foot hammering on her imaginary brake pedal.
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:lol::lol:
__________________
Tropical Buzz
Grant me the serenity to accept the things I cannot change, the strength to change the things I can, and the wisdom to know the difference. -(wasn't me)
BEWARE OF THE DOGma!! Dogmatism bites...
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01-19-2021, 07:49 PM
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CC Member
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Join Date: Feb 2001
Location: Hot Springs Village,
AR
Cobra Make, Engine: Superformance, Malachite Green, SP527, Ford 460
Posts: 2
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Not Ranked
Diff mounting bolt
I had the support bolt behind the diff break at the threads.
Last edited by Peter Sitkowski; 02-17-2021 at 03:34 PM..
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01-19-2021, 09:12 PM
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CC Member
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Join Date: Sep 2003
Location: San Jose,
Ca
Cobra Make, Engine: SPF #1436 514
Posts: 1,488
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Not Ranked
Quote:
Originally Posted by Peter Sitkowski
I had this bolt behind the diff break at the threads. I hope this helps.
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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. |
01-20-2021, 06:49 PM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,404
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Not Ranked
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
__________________
Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, Cinema Tribute Cars $ GT40’s..
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net
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01-21-2021, 09:57 AM
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CC Member
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Join Date: Jan 2017
Location: Glendale,
AZ
Cobra Make, Engine: FFR MkIV 427
Posts: 635
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Not Ranked
Quote:
Originally Posted by jhv48
I had the same banging noise when I’m hard on the accelerator.
Turns out it was my wife’s foot hammering on her imaginary brake pedal.
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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 |
01-26-2021, 11:38 AM
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CC Member
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Join Date: Feb 2016
Location: North of London,
UK
Cobra Make, Engine: AC Cars Limited, 302 EFI
Posts: 204
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Not Ranked
Have you checked the driveshaft bolts, or the UJ's?
Get it on a ramp, rotate the driveshaft with a screwdriver one way then the other. Something is obviously loose or broken.
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01-28-2021, 08:35 AM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
Quote:
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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incoming are you located in Alabama?
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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02-05-2021, 08:09 PM
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CC Member
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Join Date: Sep 2020
Location: Aston,
PA
Cobra Make, Engine: ERA #834 427 side oiler
Posts: 11
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Not Ranked
I would check the pinion angle, it could be binding on deceleration, I have seen this many times.
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02-13-2021, 03:39 PM
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CC Member
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Join Date: Jan 2021
Location: Birmingham,
AL
Cobra Make, Engine: Superformance Cobra #229
Posts: 3
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Not Ranked
Found Problem and i is a doozie
I found the problem. The cross member the front of the differential bolts to has cracked! I tried to post a picture but could not figure out how. My image is too big. Thanks for everyone's input. I did check the shock mounts and they are good. Wish that had been the problem much easier fix.  |
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