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Glow plugs stay on


 
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isdyl22
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PostPosted: Wed Apr 07, 2021 8:34    Post subject: Glow plugs stay on Reply with quote

Hi - I have a '94 2.8 Shogun which I've had for over 10 years. I've had various issues with glow plugs over the years - usually the solenoid has failed, or the plugs wear out. This week though the problem is that the plugs seem to stay on indefinitely and run the battery flat! When I go to start it however the dash light just flicks on and off in a micro second, but the engine starts fine. (after I charged the battery back up). When I connect a test lamp to the plug bus bar I can see that the plugs just stay on when the engine is running. Could this be a failed glow plug ecu, or glow plug temp sensor maybe? Any ideas would be welcome please.
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emax
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PostPosted: Wed Apr 07, 2021 14:03    Post subject: Reply with quote

As you say the plugs stay on indefinitely, I am not sure it will help, but the plugs should stay on after starting, I think for a few minutes or until the engine is warmed.
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isdyl22
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PostPosted: Wed Apr 07, 2021 16:58    Post subject: Reply with quote

Hi - thanks for your reply. I tried to post a video which I had followed but I'm not allowed to apparently. It definitely showed the glow plug bus bar receiving voltage for about 2 or 3 seconds before cranking, but zero voltage after that, which is what my Shogun used to do. I tried swapping out the ecu just now but it made no difference. I've just ordered a glow plug temperature sensor so will see if that helps. The one that is installed has a resistance of 1.6 k ohms but I'm struggling to find information as to what it should be.
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isdyl22
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Age: 50
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Joined: 05 Apr 2021
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Location: Woking

PostPosted: Sat Apr 10, 2021 11:47    Post subject: Reply with quote

Hi all, so I changed the temperature sensor located next to the forward-most glow plug but still no difference. I have so far changed the control unit/ecu located in the passenger side kick panel, and the temperature sensor. I've read that there is also a timer unit located under the ignition key area? I had a quick look and there is a couple of plugs hanging down loose that look like they should be plugged into something! Does anyone know what the timer looks like please because I can't see anything obvious that is missing its wiring plug!
Thanks
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Mark3
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PostPosted: Sun Apr 11, 2021 11:17    Post subject: Reply with quote

A correctly working 2.8 heater plug system will function thus;

Ignition only from cold heat plugs for 10 seconds, warning light on dash will illuminate for around 4 seconds

once running the heater plugs will remain powered for around 2 minutes, maybe for as long as 2.5 minutes

warm starting means the heater plugs will heat for less time depending on engine temperature until sufficient engine temp is reached that they dont come on at all.
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iam_TJ
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PostPosted: Sun Apr 11, 2021 22:06    Post subject: Reply with quote

Have you checked the relay? Sounds to me like 'sticky contacts' in a relay has caused them to effectively fuse together. This is a relatively common problem in relays of all types where the arcing between the contacts as they make or break eventually causes one side to form a pit and the other a spike (melts the material) until they stick together. I've fixed such problems with fine emery paper many times as long as the relay case will pop off.
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