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#1
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Glow Plug Light Stays On
Hey guys, the glow plug indicator light on my 85 d24t does not turn off with key in position two, even after the car is warm and has been driven. It has a new coolant temp sensor at the back of the head, which I may try swapping out with another new unit just in case. All the wiring is new and correct. The greenbook doesn't seem to offer any insight into this issue. Should I be concerned? The light shuts off once the car is started. The car came (non-running) with all glow plugs dead, and I'd rather not EVER have to replace #6 again.
The coolant temp gauge doesn't work, but that runs off of a different sensor, so I don't think it should make a difference. Adam |
#2
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You have a couple of important issues to address here.
First, forget about the glow plugs, and everything else on the car, until after you get the temperature gauge fixed or install some kind of alternative. Don't drive it without a gauge, you need to know the temperature and be able to react if it goes outside normal range. This engine is sensitive to overheating, if you have no way of knowing about it until you notice operating symptoms, then you're guaranteeing that even a very small cooling system problem will cascade to a complete engine failure. You'd hate to lose the car that way and it is avoidable. Fix this first, before you drive it another mile. Then, to address the glow plugs, we need to know a little more about what you're working on. 240 or 740, and what year? 240s up through the first half of model year 1984 used a glow control system with two relays then from 1984.5 they used a single relay system. 740/760 has the single relay system for all years. It sounds as if you may have a relay issue, or a wiring problem that has not been found yet. The temp sensor in the head rarely fails. Does the light *never* turn off with key in II, or does it just take a long long time? Do the glow plugs remain energized the entire time? If the car came to you with all 6 plugs dead, that's a good sign that there is a glow system problem. So yes, you should be concerned -- that will happen again if it remains this way and you'll have to get acquainted with that #6 plug again. After you fix the temperature gauge, provide some more info on the car and the glow issue and we'll get it figured out. The system is simple and should be able to get put right without too much trouble.
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86 745 D24T/ZF 345k lifted 2.5" 83 764 D24T/M46 155k Last edited by v8volvo; 09-08-2016 at 07:31 AM. |
#3
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940 tdi auto
hi volvo 8 my temperature gauge is broke too what do you recommend as a alternative temperature gauge that would look ok on a 940 diesel ?
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#4
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Sorry, it's an 85 740 d24t. Thought I added that.
I grounded the coolant temp wire and gauge went to full hot, so it's the sensor. Have one on the way. It must be the relay, the glow plug light comes on in pos. 2 but would previously never go out. Today the light wouldn't go off once the car had started, so I tried tapping on the relay and it went out. Then, with the car warm I started again and the light didn't come on, so it must have been working properly (seeing warm temp from sensor and not activating plugs). Either way, I'll be looking for a replacement relay. Don't suppose these are still available new from Volvo? |
#5
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There is a newer version with better logic. Site search is your friend
http://d24t.com/showthread.php?t=156...low+plug+relay
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1985 744 gle d24t 1985 745 gle d24t |
#6
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Thanks, although I'm not sure that's the one I'm looking for. Link says looking for relay pn 899117, afaik I'm looking for 899104, although that doesn't come up in volvo catalog. Volvo pn on mine is 1348 339, $188 from tasca. Is the -117 a known good update for the single relay (post 84.5) cars?
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