C5 hdi - revs dropping...

This is the Forum for all your Citroen Technical Questions, Problems or Advice.
hdi_man
Posts: 148
Joined: 18 May 2010, 13:39

C5 hdi - revs dropping...

Unread post by hdi_man »

hi all,

got my car back from dealer after suspension issue was sorted.

now in 3rd and 4th gear the revs are dropping when accelerating, its strange, revving freely then you can hear it dip and then continue.


any ideas ? MAF sensor perhaps ? :?:
Top
User avatar
Paul-R
Moderating Team
Posts: 8979
Joined: 07 May 2009, 16:24
x 1866

Unread post by Paul-R »

Unless the car has an auto gearbox, surely the revs can't alter without the road speed also altering.
As I get older I think a lot about the hereafter - I go into a room and then wonder what I'm here after.

Inside every old person is a young person wondering what the hell happened.

"Trying is the first step towards failure" ~ Homer J Simpson
Top
User avatar
mooseshaver
Posts: 886
Joined: 27 Apr 2006, 10:50

Unread post by mooseshaver »

Slipping clutch?
My first few cars (the kind that cost £100-£200), in the higher gears when accelerating the revs would climb faster than usual for the gear, then drop down. I lived with them till they dies of something else.

I don't know much about cars but maybe oil has got into the clutch when the suspension was fixed? Or maybe its just on its way out.
C5 III Tourer 2.0 HDi 163 Auto Exclusive
Gone cars.
C5 2.2 HDi Exclusive Estate auto 57. Awesome car. Sadly Could not be fixed by Citroen.
C5 1.6 HDi VTR Estate 56. Traded in.
C5 2.2 HDi SX Estate 02. Drowned in the floods of 09.
C3 1.4 HDi 92 SX 52.
Saxo 1.1 East Coast.
Top
hdi_man
Posts: 148
Joined: 18 May 2010, 13:39

Unread post by hdi_man »

could be the clutch, can only done 30k miles though !!!

back to dealers we go...this is turning into a nightmare...... :(
Top
User avatar
Paul-R
Moderating Team
Posts: 8979
Joined: 07 May 2009, 16:24
x 1866

Re: C5 hdi - revs dropping...

Unread post by Paul-R »

It wouldn't be the clutch as it would slip and the revs would rise.
hdi_man wrote:now in 3rd and 4th gear the revs are dropping when accelerating, its strange, revving freely then you can hear it dip and then continue.
This may be something that the ECU is doing wherebye it's overriding your accelerator pedal and reducing power. The only time this normally happens for me is when I'm driving on snow or ice.

Does your car have ESP/ASR? Try disabling it if it has.

BTW, I'm assuming that the car physically slows down when the revs drop and it's not like accelerating with an auto box during the change up in gear.
As I get older I think a lot about the hereafter - I go into a room and then wonder what I'm here after.

Inside every old person is a young person wondering what the hell happened.

"Trying is the first step towards failure" ~ Homer J Simpson
Top
hdi_man
Posts: 148
Joined: 18 May 2010, 13:39

Unread post by hdi_man »

yes the revs drop and there is a momentarily drop in power. the engine sounds wierd and not smooth sounding obviously when this happens.

I will try ESP off and see what happens
Top
P616VKX
Posts: 128
Joined: 01 Feb 2011, 23:04

Unread post by P616VKX »

Could it be the engine slipping into limp mode?

I used to drive a lot of Vauxhalls and if it threw up the Engine Management Light, it'd stop revving at 4,400 RPM. It wasn't as smooth as the engine's 6,500 RPM limit, it was quite noticable, it'd throw it down to 3800 and then allow it to accelerate again. Apart from that though, there was no noticable lack in power, only that you were limited.
B564PLC - Red/Grey Renault 11 GTL 'Premiere'
Top

Return to “Citroën”