Question about 2003 Ford Focus
Its either one of 2 things. A shorted glowplug is backfeeding and shutting off the timer or the timer is bad. You should start by removing the glowplugs and testing them.
The glowplugs can melt with this test so don't overdo it. Use a set of battery jumper cables and put the NEG on the metal case without damaging the threads. Then take the POS cable and touch the top of the glowplug. Its a matter of comparision. A dark glowplug is cold or dead. When you get a good one you will see an intense glow. Replace the bad ones.
After reinstalling the glowplugs try starting your car. If it still does not work well trace all of the glowplug wires up to a timer box. There should be a Power source going into the Timer. Measure the Voltage going to the Timer. If it is less than Battery Voltage follow the Power wire to a Relay. The Relay may be in the blackbox full of Relays under the hood or independently hung next to the Timer. Sometimes thoughtful Engineers put labels under the lid for each component. Check the plugin sockets for corrosion or replace the Relay for the glowplug Timer.
If you had battery Voltage at the Timer most likely the Timer is bad. The Timer should keep your glowplugs on longer the colder the outside temperature is. The exception is a warm engine. Good luck on your repair. I hope you find my solution very helpful.
Posted on Jan 03, 2011
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Posted on Jan 02, 2017
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