Glow plug question

[DrCharles]

I have eight new Motorcraft ZD-9 glow plugs and they are working fine. My controller has a good long initial glow time (around 12-15 seconds) when the temp is 20F. Shorter at 40F which it hasn't been in several days!

However, when I go to start the truck when it's fully warm (after a short stop), and just get in and turn the key, the engine fires immediately. But the GP's still come on for about 5-6 seconds (I can see it in the voltmeter) and "click" for a couple seconds after that.

Is this normal behavior for reduced emissions on start? Given that a warm engine doesn't need the GP's to start, is it going to hurt them any to be heating for those few seconds while the truck is running?

thanks.
Charles

 

[DaveBen]

This is normal. No worries.

 

[icanfixall]

nothing to worry bout..

 

[franklin2]

Someone said the factory did add that to reduce the smoke out of the tailpipe on start-up.

 

[79jasper]

It is on the powerstroke.
Also helps regulate voltage right after startup.

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