Weird bum bum bum noise when accelerating?

NICHOLAS BOZE

MEMBER
2003 HONDA CIVIC
1.7L
2WD
AUTOMATIC
157,000 MILES

So, I’ve been having an overheating problem and the coolant isn’t cycling through and the problem that has just occurred when I start accelerating once is hit around 2,000 RPMs I would here a bum bum bum noise and my car would not accelerate as fast as it was. Idk what the problem is, and I hope someone could help me here is an update, I waited 30 minutes and my car started up and it was running good, I’m not sure if the bum noise is because of my overheating or what. If someone can help me, I would really appreciate it a lot.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

It sounds like the thermostat is stuck closed. Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response. Here is a guide on how to check the thermostat out step by step with instructions below for your car.

https://www.2carpros.com/articles/replace-thermostat

Check out the images (below). Please let us know what you find.

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Saturday, May 6th, 2023 AT 11:56 AM

NICHOLAS BOZE

MEMBER
2 POSTS

I hope you can hear the sound, at first it sounds normal then near the end of the video you can hear the bum bum a little bit.

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Saturday, May 6th, 2023 AT 12:00 PM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Thanks for the video, it helps. it sounds like the exhaust system is loose under the car, I would raise the car up and use a flashing light to see if any of the exhaust hangers are loose or broken. Here is a guide that can help, and I have included the exhaust diagrams as well so you can see what I am talking about.

https://www.2carpros.com/articles/jack-up-and-lift-your-car-safely

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