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gav525

Member Since: 25 Oct 2018
Location: Co Down
Posts: 19

2006 Range Rover Vogue 4.4 V8 Java Black

Revs drops to nearly zero?

Another thing bugging me with my RR and thought i'd ask here in case anyone has experienced similar. Have tried searching but not bringing much up.

When in P or N, if I rev the engine slightly the revs drop right down before steadying at normal idle. A couple of times they have dropped so low then engine cut out. I also get this under braking, say when coming to a stop at a junction with the pedal pressed. Luckily it has never cut out in this instance though.

Any ideas before I start pulling things apart? Vacuum leak or MAF issue maybe?

Its an 06 AJ 4.4 V8 by the way.

26th Jan 2019 10:35am

Dolphinboy

Member Since: 08 Dec 2009
Location: Bristol
Posts: 3226

2016 Range Rover Autobiography SDV8 Baltic Blue

Dirty MAF

26th Jan 2019 11:19am

gav525

Member Since: 25 Oct 2018
Location: Co Down
Posts: 19

Will be the first thing to check when I get home next week then, cheers 2006 Vogue 4.4 AJV8

26th Jan 2019 12:16pm

fisha

Member Since: 25 Sep 2009
Location: Scotland
Posts: 1476

2015 Range Rover Autobiography SDV8 Aruba

MAF + 1 V8 or else ...

26th Jan 2019 10:11pm

Cam-Tech-Craig

Member Since: 04 Aug 2011
Location: Gloucestershire
Posts: 16341

2015 Range Rover SVAutobiography SDV8 Loire Blue

MAF + 3

Good shout James

27th Jan 2019 12:32am

gav525

Member Since: 25 Oct 2018
Location: Co Down
Posts: 19

Cheers all for the above advice. Back in the UK now for a month so have the time to look at things properly now.

I fitted a new MAF sensor today but still have the same symptoms.

Any other ideas? Vacuum leak maybe? 2006 Vogue 4.4 AJV8

2nd Feb 2019 6:53pm

Dolphinboy

Member Since: 08 Dec 2009
Location: Bristol
Posts: 3226

Air filter dirty/blocked?

Injector issue?

Fuel pump/ filter?

2nd Feb 2019 7:06pm

gav525

Member Since: 25 Oct 2018
Location: Co Down
Posts: 19

Will check air filter and intake tomorrow. Will be giving it a full service soon so will stick a new fuel filter in and check pump and injectors also.

It's not the end of the world like, just don't like the revs dropping so low that it nearly stalls. Would hate for it to cut out coming up to a junction or whatever. 2006 Vogue 4.4 AJV8

2nd Feb 2019 8:30pm

GraemeS

Member Since: 07 Mar 2015
Location: Wagga area
Posts: 2671

I don't know the engine but that sort of behaviour is typical of a sticky idle control valve.

Edit: No idle control valve, just electric throttle so not likely to be sticking.

2nd Feb 2019 8:36pm

Rovah

Member Since: 12 Apr 2018
Location: MO
Posts: 5

Dolphinboy wrote:
Air filter dirty/blocked?

Injector issue?

Fuel pump/ filter?

Have you figured out a cause and solution for the rpm drop?

3rd Mar 2019 5:15am

gav525

Member Since: 25 Oct 2018
Location: Co Down
Posts: 19

Nope, I'm back at work for a month so haven't had a chance yet.

When I get home end of March it'll be getting a post winter service and a few other wee jobs so will look at it then and see if I can figure out what's up. 2006 Vogue 4.4 AJV8

3rd Mar 2019 8:21am

crowebeard

Member Since: 19 Dec 2016
Location: Devon
Posts: 93

2012 Range Rover Westminster 4.4 V8 Orkney Grey

I have had exactly the same problem with the revs nearly dropping to zero, as well as the car stalling on start up when when the engine was warm. It turned out that my vacuum system wasn't connected correctly and air was being sucked straight into the inlet manifold through the PCV valve.

If you've got the AJ-V8 then this may be of no use, but on the BMW M62 there are 2 small connections on the PCV valve (indicated by the yellow arrows below)

Normally these should be both blanked off. If fitted with LPG, then the vacuum connection to the LPG system (after the vapouriser) should be plugged on to the left hand one. If it's an early vehicle (2002/3?) then the right hand one will be connected to the SAI as per the RAVE.

Mine now seems to be running normally and as an added bonus I haven't seen the Lambda control adaption fault bank 1/2 fault codes since I reconnected the LPG pipe that had come off. David

2012 Range Rover Westminster 4.4TDV8
2004 Range Rover Vogue 4.4 V8 (LPG) (Not quite gone)
2021 Mazda CX-5
2003 Porsche Boxster

3rd Mar 2019 8:34pm

gav525

Member Since: 25 Oct 2018
Location: Co Down
Posts: 19

Mine is the AJ V8 but I'll be taking a good look at the vacuum system anyways. 2006 Vogue 4.4 AJV8

4th Mar 2019 11:02am

Walkeraj101

Member Since: 25 May 2019
Location: Wirral
Posts: 3

2007 Range Rover Vogue SE TDV8 Zermatt Silver

Hi, bit of a late response but I had this issue on my M62 4.4 v8 and it was MAF and diaphram had split inside the crankcase breather on back of air intake manifold. Had to replace both and all was good after that.

15th Jul 2019 10:13pm

RR2008HSE

Member Since: 06 Jan 2013
Location: British Columbia
Posts: 2932

Had same issue. Turned out the MAF and throttle body were both dirty.

27th Jul 2019 1:40am

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