Does your Freelander 1 TD4 have turbo lag? This can be made worse by the EGR (Exhaust Gas Recirculation) valve being clogged up.
The EGR valve is there to reduce emissions. However, on the Freelander TD4 the vacuum valve, which controls the rate at which exhaust gases enter the intake, obstructs the intake airflow by 35 to 40%, which reduces the amount of fresh air which reaches the intake manifold; additionally it can attract a build-up of thick oily residue from the recycled exhaust gases, further restricting air flow.
Consequently the vacuum valve can easily get clogged and stuck open (or closed).
There are three possible actions you can take when the EGR valve gets clogged:
1. Blank the EGR valve;
2. Clean the EGR assembly;
3. Bypass the EGR (e.g. with a Super flow EGR Bypass)
Generally there are benefits in performance and economy in the TD4 when blanking or bypassing the EGR, but just cleaning it regularly is going to help.
The EGR valve is no.10 on the diagram.

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