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#1
02-10-2007, 02:21 PM
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Glow Plug Idiot Light Question
good afternoon everyone,
so last night i started up the SD and I noticed that the glow plug idiot light didnt stay on as long as it usually does. It stayed on for maybe one-two seconds if not less. The SD had a rough time starting, I had to drop the pedal to the floor to keep it from choking out...i cant remember if the idiot light means the plugs are on when it is on and off when it is off or if its just a timed light...im forgetting how the glow plugs exactly work in the SD  So does this mean anything bad/good/otherwise? Thanks, Kris
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k 
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#2
02-10-2007, 02:41 PM
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whiew, at least it's not a oil question...
the dash gp light, is just an indicator that the plugs are mostly working. it has no bearing on how long the plugs are energized. properly working the light should indicate the absolute minimum glow time. when it's cold, I let the gp's run the full time they can. if you listen you can hear the relay click when it is done. John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
02-10-2007, 04:22 PM
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Sounds like you may have a bad GP or two. dieselgiant.com has a DIY GP troubleshooting guide.
The light is just like John says.
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Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#4
02-10-2007, 04:53 PM
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Agree with BIOdiesel, check GP's with OHM meter. On my SD the light would not come on at all, found out one plug was bad, replaced, solved.
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83 SD 84 CD
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#5
02-10-2007, 08:15 PM
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Quote:
1) i verified that the relay was making noise, it did indeed click when the key was turned 2) the fuse was in good condition on the relay itself 3) i checked all GP's and they all had nearly the same value of 00.9 ohm (is that a good reading?) i am unsure of where to go from here, it could be as simple as the light in the dash is out...i dont really feel/know how to pull a 126 dash.. thanks everyone
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#6
02-10-2007, 09:25 PM
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Quote:
However, your poor starting capability seems to point in the direction of a problem with the glow plugs. Therefore, either your observations are incorrect or your testing procedure is incorrect. The glow plug light is providing you with a clue that there is a glow plug issue. The failure to offer a clean start is also supporting that diagnosis.
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