Hi everyone, I have a L322 2011 4.4 TDV8 and it randomly keeps going into Reduced Performance (Limp Mode) but does not show any faults (I am using Gap iid tool). It can do it when accelerating slowly or hard, mostly does it when going up long gradient and lightly accelerating. If i press clear all faults on Gap tool it gets rid of the Reduced Performance message and then the car runs perfectly. I did a trip of about 100 miles and it went into Limp Mode 12 times. Can anyone give me any suggestions where to start diagnosis. I have checked all hoses for splits. My car seems to have 2 air sensors one in each air box but I can only see 1 Mass air flow on Gap tool, could these trigger limp mode and not show a fault code.

Any help and suggestions how to get to the bottom of this would be great.

Regards Martin Current Range Rover Vogue SE 2011 4.4 TDV8

Previous

2003 Range Rover Vogue SE
1997 Range Rover DSE
1990 Range Rover Vogue SE
1985 Range Rover 2 Door
1979 Land Rover Series 3

I was chatting with GAP recently and they aaid a MAF error would throw up a code. Sorry i can't be more help. 2015 4.4 AB
GSXR 1000 K5
R1 1998

If teh MAF wiring goes open or short it would then show an error, if the reading were incorrect it wouldnt. I had similar problems when I first got the GAP tool, light on but no errors, there is a setting somewhere to show all errors not just ones that have happened 'x' times. Im away at the minute so cant check, have a look around in the GAP software the next time you have the fault. BMW i3 Electric Car
2012 Full Fat RR 4.4 TDV8 (now gone)
2006 VW Touareg 3.0 TDi V6

Symptoms match split hoses.

Recommend double / triple check your hoses. Cracks can appear underneath or under the hose clamps.

Number of times I've read hoses are fine, then eventually hose splits found.

. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Thanks guys for the quick responses, you have given me a few things to check, I really appreciate your help. 👍 Current Range Rover Vogue SE 2011 4.4 TDV8

Previous

2003 Range Rover Vogue SE
1997 Range Rover DSE
1990 Range Rover Vogue SE
1985 Range Rover 2 Door
1979 Land Rover Series 3

Next favourite on the list after split hoses would. be a split in the plastic plenum chamber., usually at one of the seams.
Get a clean white tissue and slowly wipe round all the joints.
Air leaks are usually spotted by finding traces of black sooty deposits near the split.
Failing that get a smoke test done.
Mike.

https://www.fullfatrr.com/forum/topic44115.html
Worth a read  G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

The original secondary turbo inlet isolation valve on 4.4's built before late 2011 is prone to sticking. It is high on the list of suspect causes after the 4 short air intake to manifold hoses. However these failures trigger fault codes so is your IIDTool correctly configured to read all fault codes?

Mine had a stuck valve replaced because of the restricted performance alarm, but it did raise a fault code to help locate the problem. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Martin

I go with the above. Mine did the same thing and that was the four short hoses one leaking from a split so replaced all four. Clean the MAF while you're in there. Just use electrical contact cleaner and as you have the plenum off clean the sensor in the throttle body.

Be careful of the small pipe leading off the rad hose connectors, easy to break and that's £80 sir.

Set the gap to read all fault status bits before you start to ensure you have as much info as possible. Cheers
Richard

(there are no such things as an ordinary FullFat, an ordinary cat or too many tools)
2011 TDV8 Vogue Santorini Black
Gap IIDBT