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#1
03-31-2008, 10:02 AM
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Glow plug light flickering on and off when driving?
I looked through the archives but didn't see this one exactly.
This morning I started my car, it started easily, though I did have the block heater plugged in. I let the car warm up for a few minutes before I left. As I was pulling out of the driveway, I saw the glow plug light was still on and would occasionally flicker off. I pulled off and looked at the fuse in the black box, but it appeared ok visually anyway. As I drove it stayed on with the occasional flicker until I got on the highway and it eventually went off and stayed off for the rest of the drive. It is misty this morning here, about 40 degrees. Any ideas what to look for?
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles 
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#2
03-31-2008, 03:15 PM
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What happens if you don't start the car but just turn the key to position 2? Does the GP light come on and stay on and then turn off (ie. normal behaviour) or does it cycle on and off?
I ask because I was recently diagnosing my own GP troubles (on my 300D, not SD) but my factory manual does indicate the GP malfunction warning modes for BOTH the SD and the D. I seem to recall that if there is a GP system issue on a 300SD it will cycle the GP light off and on to indicate a fault. I don't have the FSM with me right now but I can take a closer look later this evening.
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1984 300D Turbo, 326000 Km, Thistle Green Metallic
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#3
03-31-2008, 04:50 PM
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It just came on and went off as usual when glowing before starting.
The weird thing is that it is not blinking regularly, it is like it is mostly on, but then flickered off a couple of times randomly, and then would come back on, and eventually it finally just went off again after driving a few minutes. It was flickering as a light would if there was a bad connection to it's power source.
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles
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#4
03-31-2008, 05:02 PM
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Aha, well then you probably ought to ignore my warning-system theory. As I recall when the SD GP relay warns you of a fault, it blinks the GP light in a regular fashion for 30 seconds.
The FSM has a very detailed procedure for checking the operation of the relay and the lamp. I know that on mine (admitted, not an SD) the relay indicates which wire from its harness goes to the lamp, so you may want to start there. I know on the D the GP relay is located a ways behind the driver's headlamp on the fender wall. I think (but I could be wrong) on the SD it is located up on the driver's side firewall. As for the wiring harness on an SD GP relay, I am not sure, but I would start by checking continuity to the lamp. Can you glow and start up normally without your block heater? How cold does it get there?
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1984 300D Turbo, 326000 Km, Thistle Green Metallic
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#5
03-31-2008, 07:25 PM
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Glow relay
Chet,
Picture is of your Glow relay,may be on the driver's side "wheel hump" The strip fuse can look good,but have a hairline crack that affects the relay...Take it out and test with a Multi-meter. Oh and... Ist dieses Bild urheberrechtlich geschützt?
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'84 300SD sold 124.128
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#6
03-31-2008, 08:20 PM
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yea i checked the fuse visually, but i'll check it with a meter too
__________________
1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles
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