Question about 1988 Ford F 350

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Motor turns over but will not start it is getting fuel has new glow plugs but i don,t know if they are coming on

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Its not too hard to check the glowplugs. You can do it several ways. Either take off a wire to each glowplug and connect a test light or meter to the wire and the other end to a ground.

If its a stick shift you need it in neutral, set the brakes or block a wheel. If yours is an Automatic, Park or neutral is fine. Turn on the key and listen for a "Clicking sound". The wire you pulled off should cause the test light to light up, or the gauge to move if the gauge is set to 12 volts.

Without a test light or gauge you would just pull out a glowplug and ground the case. Reconnect the power wire and repeat the earlier test. This time you need to look at the glowplug to see if it is getting redhot.

If the power wire is is not delivering spark, you need to check the timerbox for power going into it. If the timerbox is not getting power, contact Autozone or Oreillys and see if your model has any Relay for the glowplugs. If there is power going to the timerbox and none coming out, then the timerbox is bad.

The timerbox is only on for 2 minutes or less. It stays on longer in cold weather. But a diesel uses the hot glowplugs only to start, the Timerbox will be on less and less as the glowplugs heat up. This makes diagnosing the part tough. You may have to let things cool off several times to verify it is giving the glowplugs spark.

Posted on Jun 06, 2010

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The operatoin of the glow plugs heat up the combuston chamber before turning over the engine. ONce the fuel hits the combustoin chamber , The fuel will ignite.

The diesel engine only runs on air and fuel .

The glow plugs are basically a resistor that heats up the combustion chamber or pre combustion chamber.

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