Why is my exhaust so loud? Answers from Des Moines' best auto repair
Your car suddenly sounds like a race car, and not in a good way.
You're right to look into it. A loud exhaust is usually a leak or a rusted part, and a leak near the cabin can let fumes inside.
Not safe to drive if you notice
- Exhaust smell inside the car
- Headache or drowsiness while driving
- Part dragging under the car
Visit the shop
- 5875 Fleur Drive, Des Moines, IA 50321
- Monday – Friday: 7:30 AM – 5:00 PM
- 515-745-0934
Is it safe to drive when experiencing loud exhaust?
Usually yes. Exhaust contains carbon monoxide, and a leak can let fumes into the cabin. If you smell exhaust inside the car, open the windows and have it checked right away.
Usually safe to drive
- The exhaust is louder but you smell nothing inside the car.
- A light rattle comes from under the car at idle.
- No warning lights are on and the car drives normally.
- The noise came on slowly over weeks.
Not safe to drive
- You smell exhaust inside the car.
- You feel a headache, dizziness, or drowsiness while driving.
- A part is hanging or dragging under the car.
- You smell burning or see smoke near wiring or plastic parts.
- The check engine light is flashing.
Not safe to drive? Stop and call us now.
Pull over somewhere safe and call Joey's Auto Shop at 515-745-0934. We'll help you figure out your next step.
Why an exhaust gets loud
Most exhaust noise comes from rust, a hole, or a part that has come loose somewhere between the engine and the tailpipe.
Rusted or damaged muffler
A muffler that has rusted through makes a louder roar or rumble, especially when you accelerate.
You need Muffler ReplacementHoles, gaskets, or hangers
Holes in pipes, failed gaskets, or broken hangers cause leaks and rattles. A ticking or puffing near the engine can be a manifold leak.
You need Exhaust System RepairLoose heat shield
A rattle from under the car at idle is often a loose heat shield or a broken hanger.
You need Exhaust System RepairFailing catalytic converter
A rotten egg smell or a check engine light from exhaust sensors can point to the catalytic converter.
You need Catalytic Converter Repair
What you can check first
A few things you can notice before your visit:
Note whether the noise is a roar, a rattle, or a ticking.
Notice whether it gets louder when you accelerate.
Check for any exhaust smell inside the car.
Notice a rotten egg smell from the tailpipe.
Look for a check engine light on the dash.
Ready for a quiet exhaust again?
Call Joey's Auto Shop, a Des Moines People's Choice Winner 2022 through 2026, or make an appointment and tell us what's going on.
We find the cause, not only the symptom
The fix can be a new hanger or clamp, a muffler, or a catalytic converter. The shop tests first, so only the leaking or broken part gets replaced.
- Step 1
We test
The shop inspects the full exhaust system from the engine to the tailpipe, looking for leaks, rust, and loose parts.
- Step 2
We show you
You get a digital inspection with photos and notes in plain language, so you see what we see.
- Step 3
You decide
Nothing starts until you approve it, and we confirm the fix before you pick up your car.
Why does my exhaust smell like rotten eggs?
Gasoline contains a small amount of sulfur. A healthy converter changes it into a gas you can't smell. When the converter is failing, or the engine is running too rich, the sulfur comes out as hydrogen sulfide, which smells like rotten eggs. The smell is a sign the converter or the fuel mixture needs attention before it causes more damage.
Is an exhaust leak more than just noise?
Yes. Exhaust contains carbon monoxide, a gas you cannot see. A leak under the car can let fumes into the cabin, which is dangerous. If you smell exhaust inside the car, open the windows and have it checked right away. A headache, dizziness, or drowsiness while driving is a reason to stop and get fresh air.
Why do exhaust systems rust out so often?
The exhaust runs under the car, where it takes the brunt of water, slush, and road salt every winter. Iowa road salt is hard on exhaust parts, so rust-through on mufflers, pipes, and hangers is common. Once rust opens a hole, the exhaust gets louder, and the leak can grow quickly.
What does a ticking sound near the engine mean?
A ticking or puffing sound near the engine, often loudest on a cold start or when you accelerate, can be a leak at the exhaust manifold. The manifold collects exhaust from the engine and sends it into the pipe. When its gasket fails, exhaust puffs out with each engine pulse, which you hear as a tick.
Other symptoms we can help with
See All Symptoms
Check Engine Light Is On
A steady or flashing check engine light means your car's computer found a problem. Some causes are small. Some get expensive if you wait.
Learn More
Rough Idle or Stalling
A shaky idle, hesitation when you press the gas, or an engine that dies at stops usually traces back to fuel, air, or spark.
Learn More
Too loud?Let's quiet it down.
Make an appointment and tell us what's going on. We explain your options before any work begins.