LR
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EngineLow severity

Td5 EGR valve sticking, rough idle and smoke

Annoying rather than dangerous.

Symptoms

Lumpy idle, black smoke, hesitation and a sooty intake manifold.

Likely cause

The exhaust gas recirculation valve gets clogged with carbon and sticks partly open.

Suggested fixes

Listed roughly in the order most owners try them.

  1. 1

    Clean the EGR valve and intake

    Remove the valve and clean off the carbon. Clean the intake manifold at the same time, as the deposits build up there too.

    Difficulty:
    Moderate DIY
    Cost:
    £ (Under about £50 in parts)
  2. 2

    Replace the EGR valve

    If cleaning does not help, the diaphragm or modulator may be faulty. Check the vacuum pipes before replacing the valve.

    Difficulty:
    Moderate DIY
    Cost:
    ££ (About £50 to £300)

This is general guidance gathered from owner experience and workshop practice, not a substitute for a workshop manual or a qualified mechanic. Costs are rough parts-only guides. Brakes, steering and suspension work affects safety, so if in doubt have it checked professionally.

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