Swirling sound from EGS

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Erik WG
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Joined: 17 Jun 2019, 19:13

Swirling sound from EGS

Post by Erik WG » 15 Jul 2019, 09:32

Good morning everybody,

Got very good advice in this forum previously concerning my wife's 2008 Citroën C4 before purchase. The car had only the belt and wheels replaced when the timing belt service was done last year, not the water pump. Some comments recommended replacing even the water pump, so the wife made the dealer do the whole service all over again, replacing even the water pump :-D

She's got the car now, it's got 50 000 miles under the belt (80 000 km). The car has the EGS (electronic gear system) gearbox. It shifts well up and down and it kicks down the way it should. It hums at a tranquil 2000 rpm:s in 70 mph on the motorway. One thing I noticed is a swirling (don't now how to explain it, as I'm a Norwegian) sound, a mechanical sound, from the car when quickly removing the foot from the accelerator pedal after acceleration at lower speeds (20-30 km/t). The system works brilliantly though, we don't think the EGS is difficult to drive at all.

Should this be of some concern?

Anyway, the car is like a flying carpet on the motorway. Wife loves it, brilliant car.

Yours sincerely,
Erik

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GiveMeABreak
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Re: Swirling sound from EGS

Post by GiveMeABreak » 15 Jul 2019, 10:54

Just on the other issues Erik. The timing belt operation does not include the water pump. It is optional and the service kit are available as the belt only, the belt and the tensioner rollers and pulleys, and lastly, all of the previous parts just mentioned with the water pump and gasket.

You have to ask if you want the rollers and water pump doing. They don't do the water pump much these days as they deem the water pump to be very reliable - unlike older cars - It's a matter for the customer though as it is the labour that costs on this job, so some like to get it done at the same time.

As for the EGS - yes, a basic clutch and manual gearbox, but with hydro-electrically operated clutch and gearbox actuators. Great when they work, but can be very expensive when they go wrong. Plenty of grief here on these systems - although one or two people here like them. I prefer a manual or fully automatic with torque converter, but never would buy anything with an EGS system.

As for the noise, that is likely to be the turbo spooling backwards to get rid of pressure when you take your foot of the pedal quickly. I suggest you recommend to your wife that she doesn't put the pedal to the metal too often - but if she does, then always ease off the accelerator. :-D

Erik WG
Posts: 3
Joined: 17 Jun 2019, 19:13

Re: Swirling sound from EGS

Post by Erik WG » 15 Jul 2019, 11:13

Thanks for the information! Cheers!