Hello all,

I know there are 100's of threads about restricted performance but I can't find one that describes exactly what I have.

I have a 2010, RRS 3.0.

It has just had its alternator and battery changed.

Driving along just fine and all of a sudden the restricted performance light comes on. Shortly after this the low coolant level light comes on.

I was only a few miles from home so carefully limped back and left it over night. Now when I start it, the low coolant light is there all the time, however the restricted performance light goes away, you can drive it another 20 miles or 20 mins then the light comes back. It doesn't restrict me to a low speed (I can still do 70 down the motorway, its just got higher revs than normal) I seem to have lost maybe 3 to 4 MPG on fuel economy and the acceleration had completely disappeared below 2000 revs and its slow above that.

If I pull over, put it in neutral and give it a few revs, you hear a very clear sucking/whooshing sound when lifting off the gas, there is also (and only sometimes) a very rhythmic clicking, then it goes away.

Whilst accelerating you can a slight whistle coming from the engine bay.

I have someone coming in two days with a code reader however I think it is a generic one and I'm sure it with through out incomplete codes.

I know a cracked manifold or bad MAF can caused the restricted performance (along with a load of other things) I am wondering if anyone has any idea what this might point to.

Unfortunately I don't know if the low coolant is linked to this or not, I know the sensor in the bottles fails regularly as it's happened in both my past LR3s, so could be as simple as that as there is plenty of coolant in there.

Any help appreciated.

Thanks

Could one of the issues be your Intercooler hose is cracked/split.
I have the V8 and I had the Restricted Performance and slow acceleration.
There was a 2 inch split in one the hoses. 2010 HSE TdV8 in Stornoway Grey.
Powerful Roof Rails and Spare Wheel protector

This is something I need to look at however this also happened on one of my LR3s, I didn't get restricted performance but did get a lot of smoke out the exhaust when accelerating hard with that problem. Worth a check if it's given you the restricted performance... Thanks

Had smoke from the exhaust and performance was restricted in my TDV8 earlier this year , took it to my indi who found a split turbo boost hose cheap fix £19, I had feared it may have been the turbos which would have been considerably more.

Yes, I am dreading it is turbos but the car is absolutely FINE for about 20mins after starting each day so I think they are working fine....