Freelander 1 TD4 No power under 2000 rpm

websun said:

You can get ei gasket for a fiver or something on ebay if it's not a nice seal. Or replace the manifold if the screws are wrong. I have one in the shed

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I may get another manifold anyway as I couldn't get the currently one as clean as I wanted.

I finally tried the car with the MAF sensor unplugged, and it runs and drives great!
So, either the new sensor is also foobard or there is a problem that only occurs with a sensor plugged-in.
I'm opting for the first option.
Interestingly I didn't get a MIL when driving with no MAF sensor.
I'll see if I can find a genuine one!

From what I've experienced I think you have to drill a whole in this engine to get the EML on.
On the K series maybe just a tap on rocker cover will do.

websun said:

On the K series maybe just a tap on rocker cover will do

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Head gasket aside, the K series is more reliable than the TD4, or at least doesn't suffer so many hard to find faults.

Agree just the check engine part... But does get more accurate. Even live data from delphi show 4 times more info.
Head gasket also fails on Toyota rav4 which is "Japanese reliable" not to mention Vauxhalls. I have no idea why these got more attention.
I have both td4 and k, and td4 just seems better built to me. For me to call roadside assistance on the td4 I have to be very unlucky else on petrol a simple failed coil will do. I guess it's petrol vs diesel debate.
On topic, I had a hose split and removing the sensor also improved it in the exact same way. Very unlikely for a new bosch maf to fail but not impossible. Can't remember topic history but was the map sensor tested?