Dogsleg said:

Hi everyone,

got a 53 reg defender TD5 normally starts and runs lovely from cold.This morning was our first really frosty one and i had a problem.It started ok but ran like a piece of s**t and had no power. drove it a couple of miles to work, left it in the yard for an hour or two then tried it again and it was fine. Almost like something had frozen then thawed out. Any ideas please.

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The purpose of the glow plugs is:
l Assist cold engine start.
l Reduce exhaust emissions at low engine load/speed.
The main part of the glow plug is a tubular heating element that protrudes into the combustion chamber of the engine.
The heating element contains a spiral filament that is encased in magnesium oxide powder. At the tip of the tubular
heating element is the heater coil. Behind the heater coil and connected in series is a control coil. The control coil
regulates the heater coil to ensure that it does not overheat and cause a possible failure. The glow plug circuit has its
own control relay located in the engine compartment fuse box.
Pre-heat is the length of time the glow plugs operate prior to engine cranking. The ECM controls the pre-heat time of
the glow plugs based on battery voltage and coolant temperature information via the glow plug relay.
Post-heat is the length of time the glow plugs operate after the engine starts. The ECM controls the post-heat time
based on ECT information. If the ECT fails the ECM will operate pre/post-heat time strategies with default values from
its memory. The engine will be difficult to start.

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