FabSwingers.com forum: Car is making a loud noise when idling any ideas what it might be please?

By *ex-a-frolics OP Couple
over a year ago

Brizzle

Have an old Audi which makes a loud noise but only when idling. It sounds like the noise of a drill used for digging the roads. It varies in loudness but as soon as you depress the clutch or accelerator it disappears.

I’ve had this on start up a few times where it’s been so loud I’ve been scared to drive it, but usually turning the engine off & restarting the noise goes & when I’m driving there’s no issues.

It’s an intermittent problem.

Any ideas what might be wrong, save getting ripped off in a garage.

Thanks.

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By *ayHaychMan
over a year ago

Leeds (Home) / Sheffield (Work)

Hmm I’m not an expert on cars but since it goes when you depress the clutch it may be a fault with the flywheel?

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By *ice and PeasCouple
over a year ago

West Midlands

"Hmm I’m not an expert on cars but since it goes when you depress the clutch it may be a fault with the flywheel? "

I agree

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By *thanhoyleMan
over a year ago

rochdale

"Hmm I’m not an expert on cars but since it goes when you depress the clutch it may be a fault with the flywheel?

I agree "

I would say thrust bearing new clutch kit required

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By (user no longer on site)
over a year ago

clutch release bearing.

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By *ex-a-frolics OP Couple
over a year ago

Brizzle

"Hmm I’m not an expert on cars but since it goes when you depress the clutch it may be a fault with the flywheel?

I agree

I would say thrust bearing new clutch kit required "

Ouch that sounds expensive, that would explain when depressing the clutch the noise goes, but why when touching the accelerator has the same effect? Thanks.

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By *haron StonerTV/TS
over a year ago

Haywards Heath

Sometimes a broken motor mount or the rubber bushing has perished.

Get someone else to start your car and with a piece of hose pipe to your ear, you'll be able to determine where the noise is coming from. Also a description of the noise would be useful.

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By *akie32Man
over a year ago

winchester

if its got a duel mass flywheel, then its the most likely cause tbh, but without hearing the noise it could be anything

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By *unmatt888Man
over a year ago

Duns

Could be hydraulic valve lifters.

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By *ebjonnsonMan
over a year ago

Maldon

Get along to a good independent garage. Avoid the main dealers, ‘stealers’ as we call them.

How many miles by the way?

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By *ilfCrumpet9Man
over a year ago

Wirral

Feel free to contact me I have a motor trade background

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By *leecouple101Couple
over a year ago

North East Lincolnshire

Possibly clutch release bearing but more probably DMF

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By (user no longer on site)
over a year ago

"Could be hydraulic valve lifters."

I would agree.

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By (user no longer on site)
over a year ago

If you are lucky,it's the mounts. If unlucky it may be the full fly wheel. Obviously can't be certain either way based on info given. If it's option 1 expensive (Audi's are buggers to work on) but not too bad and car will still run for a while. If it's fly wheel and depending on car, might be cheaper to bin it. Good luck! M

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By *andonmessMan
over a year ago

A world all of his own

"Have an old Audi which makes a loud noise but only when idling. It sounds like the noise of a drill used for digging the roads. It varies in loudness but as soon as you depress the clutch or accelerator it disappears.

It’s an intermittent problem.

Any ideas what might be wrong, save getting ripped off in a garage.

Thanks. "

It sounds like it's something to do with either the clutch, flywheel or clutch release bearing and the only way to investigate properly is to remove/separate the gearbox and bellhousing from the engine. Weird that it should go away when you stop and restart the engine though

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By *ts the taking part thatMan
over a year ago

southampton

Thrust bearing or simply something loose in the engine bay. When the engines cold shake a few bits and see if they are loose.

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By (user no longer on site)
over a year ago

Rule 1, never buy vw/audi group cars!

Also on the fault what audi is it? Is it 4wd?

-Does it do it when the clutchs not pressed?

-Does it rattle when the clutch is pressed?

-Does it do the same in gear with the clutch pressed?

-Does it do it in gear when accelerating (no clutch pressed)

-does it make any difference with the aircon on?

-does it make any difference locking the steering side to side?

Depending on the above answers it could be

-dmf

-prop shaft bearing (if 4wd)

-idler pully bearing

-alt/pump/pas pully bearing

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By *ichaelangelaCouple
over a year ago

notts

If it was just a strange ticking noise i would have suggested it could have been the indicators

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By (user no longer on site)
over a year ago

Find an independent garage by asking friends, word of mouth is better than adverts or the directory

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By *ex-a-frolics OP Couple
over a year ago

Brizzle

"Rule 1, never buy vw/audi group cars!

Also on the fault what audi is it? Is it 4wd?

-Does it do it when the clutchs not pressed?

-Does it rattle when the clutch is pressed?

-Does it do the same in gear with the clutch pressed?

-Does it do it in gear when accelerating (no clutch pressed)

-does it make any difference with the aircon on?

-does it make any difference locking the steering side to side?

Depending on the above answers it could be

-dmf

-prop shaft bearing (if 4wd)

-idler pully bearing

-alt/pump/pas pully bearing

Like I said earlier, the noise is only on idling, when the car is started or when in traffic etc. It’s not there when driving & depressing the clutch or pressing the accelerator stops the noise.

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By *entleman JackMan
over a year ago

Loughborough

Simple stuff first.........

Check the oil level with the dipstick, top up as required.

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By (user no longer on site)
over a year ago

Could be the main gearbox shaft bearings. When in neutral with foot off the clutch they rattle.

As soon as you engage drive the gears exact pressure on the shaft and it stops rattling

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By (user no longer on site)
over a year ago

"Rule 1, never buy vw/audi group cars!

Also on the fault what audi is it? Is it 4wd?

-Does it do it when the clutchs not pressed?

-Does it rattle when the clutch is pressed?

-Does it do the same in gear with the clutch pressed?

-Does it do it in gear when accelerating (no clutch pressed)

-does it make any difference with the aircon on?

-does it make any difference locking the steering side to side?

Depending on the above answers it could be

-dmf

-prop shaft bearing (if 4wd)

-idler pully bearing

-alt/pump/pas pully bearing

Like I said earlier, the noise is only on idling, when the car is started or when in traffic etc. It’s not there when driving & depressing the clutch or pressing the accelerator stops the noise. "

when your car is in idle the hydrolic valve lifters in your engine are not getting the correct pressure they need to cover the engine valves so when you accelerate the pressure increases stopping the knocking noise.

I searched knocking sound when in idle it came up with the above diagnosis

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By (user no longer on site)
over a year ago

"Rule 1, never buy vw/audi group cars!

Also on the fault what audi is it? Is it 4wd?

-Does it do it when the clutchs not pressed?

-Does it rattle when the clutch is pressed?

-Does it do the same in gear with the clutch pressed?

-Does it do it in gear when accelerating (no clutch pressed)

-does it make any difference with the aircon on?

-does it make any difference locking the steering side to side?

Depending on the above answers it could be

-dmf

-prop shaft bearing (if 4wd)

-idler pully bearing

-alt/pump/pas pully bearing

Like I said earlier, the noise is only on idling, when the car is started or when in traffic etc. It’s not there when driving & depressing the clutch or pressing the accelerator stops the noise.

I searched knocking sound when in idle it came up with the above diagnosis "

Wont be lifters audi use rollers and have done for years, this issue is generally only on ohc engines or Compound Valve angle engines.

If its 4wd 'Q' audi they suffer fron noisy shaft bearings that cause the issue youve mentioned, if not could be the output bearing or thrust bearing on the clutch.

Also check your undertray or engine cover, these are a issue for coming loose on vag group cars and will sound as you described.

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By *ily WhiteWoman
over a year ago

Also check your undertray or engine cover, these are a issue for coming loose on vag group cars and will sound as you described.

Yes, I've had this on a Golf...the wheel arch liners have a tendency to come loose too, but they make a different noise

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By (user no longer on site)
over a year ago

It’s an intermittent problem.

Any ideas what might be wrong, save getting ripped off in a garage.

Thanks. "

Are you parked next to someone digging up the road?

If your not it's something else.

Always happy to help.

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By *haron StonerTV/TS
over a year ago

Haywards Heath

Once I forgot to tighten the cam belt tensioner, I was ill, bored so did some work on the motor, boy did that make a bit of racket as the pistons started to hammer the valves into bendy shapes.

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By *hoirCouple
over a year ago

Clacton/Bury St. Edmunds

It’s an intermittent problem.

Any ideas what might be wrong, save getting ripped off in a garage.

Thanks. "

Sounds like the car.

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By *ornywelsh2sumCouple
over a year ago

Neath valley.

[Removed by poster at 28/01/22 18:48:24]

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By *ornywelsh2sumCouple
over a year ago

Neath valley.

Somewhat ironically, and despite the fact that the primary purpose of dual mass flywheels is to reduce engine vibrations, excessive vibration that may or may not be accompanied by “clunking”, “thudding”, or other mechanical noises is usually the first symptom of a failed or failing dual mass flywheel.17 Jan 2019

Sounds like dual mass flywheel death rattle.

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