Disconnecting 300TDi glow plugs? - Defender Source
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  #1  
Old March 28th, 2016, 04:47 PM
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Disconnecting 300TDi glow plugs?

Possibly dumb question, but here goes:

-Is there a wrong way to disconnect 300TDi glow plugs? I've seen many folks recommend disconnecting them when they're not needed, but haven't been able to find anything re. how to do that. Obviously I can disconnect the lead from the relay to the plugs, but wanted to make sure that won't screw something up, and if I should disconnect something further upstream. . .

Thanks much!
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  #2  
Old March 28th, 2016, 04:48 PM
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Can't see a great reason to not leave them hooked up, but I guess taking out the relay would work
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Old March 28th, 2016, 04:54 PM
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They don't wear out from all the unneeded cycling? (I'm moving to NC soon, and probably won't need them for several years . . . ) If it's a wash, though, I'll just leave them hooked up; not doing stuff is my favorite project type.
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Old March 28th, 2016, 04:59 PM
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I figure they're cheap enough,but to each their own!
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  #5  
Old March 28th, 2016, 05:06 PM
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@ $6 ea why worry ? That said there is a $75 timer relay that if you simply unplug it and put it in the glove box disables the circuit.

http://www.ebay.com/itm/like/3710300...&ul_noapp=true
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Old March 28th, 2016, 06:15 PM
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I have mine on it's own fused circuit.
In all but the coldest of temperatures, I leave the fuse of this circuit pulled.
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Old March 28th, 2016, 06:23 PM
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I personally think they die faster when not used regularly. They need to fully heat to clean off the carbon.
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Old March 28th, 2016, 06:30 PM
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Quote:
Originally Posted by Red90 View Post
I personally think they die faster when not used regularly. They need to fully heat to clean off the carbon.
Been down this road, I agree.
(my opinion isn't worth S#&% but the 70 year old diesel mechanic who was working on the motor said the same thing, and I happen to take his word for truth).

There's also something to be said about using them before you know you need them. What if you need them, try to hook back up and find a fault?
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Old March 28th, 2016, 06:40 PM
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If you have ever had a glow plug refuse to unscrew because its all welded in with carbon, you would never consider intentionally disabling them to facilitate that process
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  #10  
Old March 28th, 2016, 08:07 PM
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OK, thanks, folks. I guess that settles it; I'll leave 'em operational and cross this item off my investigation list. Thanks for everyone's input.
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Old March 28th, 2016, 08:26 PM
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The Tdi glow plugs are disabled when you start cranking. If you just crank the engine without pausing for them to come on, then they won't be energized for anything but the minutest fraction of a second. That is if you are using the factory relay and have it wired correctly.
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Old March 28th, 2016, 08:37 PM
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Quote:
Originally Posted by Ren Ching View Post
The Tdi glow plugs are disabled when you start cranking. If you just crank the engine without pausing for them to come on, then they won't be energized for anything but the minutest fraction of a second. That is if you are using the factory relay and have it wired correctly.
And, IMO, that is what kills plugs. If you don't let them cycle, they get coated in carbon and overheat when used, burning out. If you always let them cycle, they never die, as they stay clean.
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Old March 28th, 2016, 08:40 PM
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Quote:
Originally Posted by Ren Ching View Post
The Tdi glow plugs are disabled when you start cranking. If you just crank the engine without pausing for them to come on, then they won't be energized for anything but the minutest fraction of a second. That is if you are using the factory relay and have it wired correctly.
Yup, factory setup, AFAIK, and, yeah, in warm weather, I usually don't let the glow plugs glow, but according to stuff I've read (forget where) and my glow plug light, they sometimes come on after the engine is started--not so?

So perhaps the fact that they probably cycle at least some even if I do just hit the starter will avoid the carbonizing Red 90 mentions. . .
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  #14  
Old March 29th, 2016, 06:32 AM
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Just because the weather is "warm", doesn't mean that the engine doesn't need the plugs, or, in other words, that the engine won't start "smoother" as in, not coughing and smoking for the first few seconds.


If they're fitted I'd leave it be.
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