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  #1  
Old 02-20-2008, 10:09 PM
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glow plug light meaning?

if the glow plug light on dash comes on does that mean the glow plugs are ok or could they still be faulty...thanks..
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  #2  
Old 02-20-2008, 10:41 PM
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What car/engine?
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  #3  
Old 02-20-2008, 10:41 PM
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Still could be something wrong. Best quick check is to disconnect the relay plug and read each plugs resistance. Thats if your relay is mounted in the engine compartment.
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Old 02-20-2008, 11:09 PM
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1982 non turbo 300d euro....will check glow plugs...thought light wouldn't function if plugs were bad...car not firing up in cold weather...will check valve adjustment
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  #5  
Old 02-20-2008, 11:13 PM
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Unless the Euro is different, the light could function normally with one inoperative glow plug. More than one inop plug should cause the pre-glow light to not illuminate. This, of course, assumes that the fault detection circuit is operating normally.
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  #6  
Old 02-20-2008, 11:13 PM
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The light will still come on with some plugs bad. I had one bad one (open) a couple months ago and the light still came on as normal. When I first bought the car it had two bad ones (open) and the light would come on but go off again quickly.

I've also seen a 7.3 IDI International do the same with four bad ones.
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  #7  
Old 02-20-2008, 11:17 PM
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the light comes on for about 10 seconds..it's easily below freezing out
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  #8  
Old 02-20-2008, 11:19 PM
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i read that they could all be out and the light would come on
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  #9  
Old 02-20-2008, 11:23 PM
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Quote:
Originally Posted by newpastlife View Post
i read that they could all be out and the light would come on
That is true. The fault detection balances the current between the number one plug and plugs 2-5. If they are all out, there is no imbalance.
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  #10  
Old 02-21-2008, 01:36 PM
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But if they are all out, I wouldn't think you could start it at all.
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  #11  
Old 02-21-2008, 02:02 PM
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newpastlife,

U can put a voltmeter or 12v test light on a GP terminal see if it is getting voltage when U turn the key switch to the GP position.

P E H
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  #12  
Old 02-21-2008, 05:41 PM
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You can also check resistance with an OHM meter. Less than one is good. As you can see I need to replace these, I now have them. Started this morning tho, upper twenties.
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glow plug light meaning?-ohm-cropped-three.jpg   glow plug light meaning?-ohm-cropped-two.jpg   glow plug light meaning?-ohm-red-cropped-three.jpg  
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  #13  
Old 02-21-2008, 08:30 PM
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Too Many,

U will get more accurate readings if U get a bananna plug test lead for your ohm meter to plug into the terminal holes of the GP cable and an alligator clip for the ground test lead.

A GP that reads 1.7 ohms is probabaly good. What did the other GPs read in ohms.

P E H
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