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Noises

Exhaust blowing noise

A blowing exhaust changes the sound of the car and can affect emissions readings and sensor behaviour as well as noise.

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Symptoms drivers describe

  • Deeper or louder note, worst on acceleration
  • Puffing or ticking from under the car or bonnet
  • Smell of fumes around the car
  • Vibration through the floor at certain revs

Possible causes

  • A corroded joint, box or pipe
  • A split flexi pipe
  • A blown manifold or downpipe gasket
  • A cracked manifold on some engines
  • Failed mountings letting the system knock and split

What you can do

  • Have it checked before an MOT — leaks are a common failure point
  • Do not drive with fumes entering the cabin

How we check it in the workshop

We inspect the full system on the lift, locate the leak with the engine running and advise on repair or section replacement.

Is it safe to keep driving?

Fumes entering the cabin should be treated as urgent. Otherwise it is usually a repair to book in soon.

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Noises

Other symptoms in this group

Humming or droning noise that changes with speedNoises that follow road speed rather than engine speed usually come from wheels, bearings or tyres. Whether it changes on a bend is the key test.Read more Clicking or knocking noise when turningA click that appears on lock and speeds up as the wheels turn faster is typically driveshaft related rather than a suspension knock.Read more Rattling noise on start-up that goes awayA short rattle from cold that clears once oil pressure builds is a common early warning. Ignoring it can turn a chain job into an engine job.Read more Whining noise when acceleratingThe useful question is whether the whine follows engine revs or road speed, because that separates belt and turbo noises from gearbox and differential noises.Read more Wheel bearing noise: what it sounds likeBearing noise follows road speed, not engine speed, and typically changes as weight moves across the car on a bend.Read more Rattling noise from under the carRattles are located by loading and tapping components with the car on a lift, because a loose shield can sound exactly like something far more serious.Read more

Want this looked at properly?

Send us your registration and describe the symptoms — we will tell you what the next step is.

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