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post #2 of (permalink) Old 3rd June 2007
Technical Supremo

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Hi Nev - the glow plug system doesn't operate every time the engine starts - it will depend on the engine temperature, airflow temperature and ambient temperature. The ECU evaluates all these values and will not only control the glow plugs but also injection timing and fuel flow. As you mention the engine performs better when cold it could be you have a temperature sensor problem or there is also the possibilty of a faulty glow plug because if the electrical values in this circuit are above or below the norm the ECU can be fooled into thinking the engine is always cool. The glow plugs can be checked using a multi-meter measuring their resistance individually - and should read 0.6 ohms - you will need to disconnect their feed cables during testing - it also may be worth checking the ambient temperture sensor in the dor mirror.
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