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KBH67
Samba Member
Joined: October 09, 2024
Posts: 13
Location: Florence Arizona
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 Posted: Tue Nov 04, 2025 4:56 am Post subject: ODD "THUMP" |
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| My 73 Super Beetle has an odd thump when coasting. It runs great, but when I let off the gas and start braking, you can hear a thump coming from the rear. Not from the motor but it's definitely in the back end. Any ideas? |
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NJ John
Samba Member
Joined: September 21, 2007
Posts: 3047
Location: HdG, MD & NJ
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| Posted: Tue Nov 04, 2025 6:46 am Post subject: Re: ODD "THUMP" |
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A constant thumping or a single thump?
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1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
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KBH67
Samba Member
Joined: October 09, 2024
Posts: 13
Location: Florence Arizona
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| Posted: Tue Nov 04, 2025 6:57 am Post subject: Re: ODD "THUMP" |
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| NJ John wrote: |
| A constant thumping or a single thump? |
Constant |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 80544
Location: Sneaking up behind you
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| Posted: Tue Nov 04, 2025 6:58 am Post subject: Re: ODD "THUMP" |
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CV joint?
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
#BlueSquare
עַם יִשְׂרָאֵל חַי |
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doug bugg
Samba Member
Joined: March 08, 2003
Posts: 398
Location: Minneapolis
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| Posted: Tue Nov 04, 2025 7:45 am Post subject: Re: ODD "THUMP" |
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Is it when you start braking and keep braking or after you let up off the brakes?
Are your rear shoes somehow wonky?
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"Knowledge is Good" - Faber College |
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KBH67
Samba Member
Joined: October 09, 2024
Posts: 13
Location: Florence Arizona
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| Posted: Tue Nov 04, 2025 8:06 am Post subject: Re: ODD "THUMP" |
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| doug bugg wrote: |
Is it when you start braking and keep braking or after you let up off the brakes?
Are your rear shoes somehow wonky? |
It's not in the brakes. Does it when coasting, braking or whatever. |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4569
Location: viroqua wi.
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| Posted: Tue Nov 04, 2025 8:21 am Post subject: Re: ODD "THUMP" |
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| Coasting in neutral? |
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KBH67
Samba Member
Joined: October 09, 2024
Posts: 13
Location: Florence Arizona
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| Posted: Tue Nov 04, 2025 10:17 am Post subject: Re: ODD "THUMP" |
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| bsairhead wrote: |
| Coasting in neutral? |
Coasting in neutral, or in gear. |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 80544
Location: Sneaking up behind you
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| Posted: Tue Nov 04, 2025 10:41 am Post subject: Re: ODD "THUMP" |
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^^^^^^
This
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
#BlueSquare
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doug bugg
Samba Member
Joined: March 08, 2003
Posts: 398
Location: Minneapolis
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| Posted: Wed Nov 05, 2025 6:55 am Post subject: Re: ODD "THUMP" |
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| KBH67 wrote: |
| bsairhead wrote: |
| Coasting in neutral? |
Coasting in neutral, or in gear. |
You can only coast out of gear in neutral or with the clutch pedal depressed. The engine under a load, or engine braking, is not coasting.
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4569
Location: viroqua wi.
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| Posted: Wed Nov 05, 2025 7:15 am Post subject: Re: ODD "THUMP" |
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| doug bugg wrote: |
| KBH67 wrote: |
| bsairhead wrote: |
| Coasting in neutral? |
Coasting in neutral, or in gear. |
You can only coast out of gear in neutral or with the clutch pedal depressed. The engine under a load, or engine braking, is not coasting. |
What about my question confused you? |
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doug bugg
Samba Member
Joined: March 08, 2003
Posts: 398
Location: Minneapolis
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| Posted: Wed Nov 05, 2025 8:14 am Post subject: Re: ODD "THUMP" |
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Oh, nothing. Just saying that the only time you can coast is in neutral.
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4569
Location: viroqua wi.
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| Posted: Fri Nov 07, 2025 7:56 am Post subject: Re: ODD "THUMP" |
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| doug bugg wrote: |
| Oh, nothing. Just saying that the only time you can coast is in neutral. |
Am I not coasting when I depress the clutch in gear ? |
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doug bugg
Samba Member
Joined: March 08, 2003
Posts: 398
Location: Minneapolis
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| Posted: Fri Nov 07, 2025 8:32 am Post subject: Re: ODD "THUMP" |
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| doug bugg wrote: |
| KBH67 wrote: |
| bsairhead wrote: |
| Coasting in neutral? |
Coasting in neutral, or in gear. |
You can only coast out of gear in neutral or with the clutch pedal depressed. The engine under a load, or engine braking, is not coasting. |
Ummm, yeah. Like I said...
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