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A popping sound when idling coming from one side of the exhaust?

Tiny
CJLOVELESS
  • MEMBER
  • 1995 CHEVROLET CAPRICE
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
I have the car listed above Classic. It has a popping sound when idling coming from one side of my exhaust, and it pops a lot more when I go to accelerate and barely goes. It won't go over like 40 MPH, and it takes a long time to get up to 40 MPH. I've changed the plugs, TPS, and took the catalytic converter off. I've checked my fuel injectors and my fuel pressure. I'm stumped here.
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Saturday, September 2nd, 2023 AT 9:42 AM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like you have a broken valve spring or a blown head gasket between two cylinders, either way a compression test can help us see what's going on, also if you upload a short video of the noise, I can tell for sure what's going on.

This guide can help us get started on fixing the problem:

https://www.2carpros.com/articles/how-to-test-engine-compression

Please go over this guide and get back to us.
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Saturday, September 2nd, 2023 AT 6:24 PM
Tiny
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  • 6 POSTS
It might not be the best video but if it's not good enough let me know and I will record another video.
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Saturday, September 2nd, 2023 AT 9:11 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Thanks for the video. It does sound like a broken valve spring, or the valve train has fallen apart, you can remove the valve covers for an inspection. Use a flashlight it helps with the inspection. Please check the image below to see what I am talking about.
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Sunday, September 3rd, 2023 AT 10:48 AM
Tiny
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Okay, thank you. I'll check into that and let you know the verdict.
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Monday, September 4th, 2023 AT 8:19 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Please do, if you find something you have a question on please upload an image a short video.
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Tuesday, September 5th, 2023 AT 10:44 AM
Tiny
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  • 6 POSTS
There is a lot of oil shooting out of the 1 and the 3rd on in the passenger side going from right to left.
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Wednesday, September 13th, 2023 AT 1:09 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Wow, you are not kidding, thanks for the video. It looks like the engine has a spun bearing which is affecting the oiling of the engine and making the noise. You are going to need to remove the engine and disassemble it to find the problem.
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Thursday, September 14th, 2023 AT 10:37 AM
Tiny
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Man, that's just too much for me to get into. I don't really have the time, but thanks for all your help.
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Thursday, September 14th, 2023 AT 11:13 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
You are welcome, use 2CarPros anytime, we are here to help. Please tell a friend.
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Friday, September 15th, 2023 AT 10:12 AM

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