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#1
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did diesel purge kill my glow plugs?
okay.
i'm trying to recount my weekend of events it is killing me that i can't find the cause of the glow-plug failure coincidence is causality in my book. i had a previous post on 'order of operations' and that list was effectively to do a valve adjustment, purge, do a compression test i never got to the compression test because i started chasing the lack of a gp light on my dash question: can diesel purge kill my glow plugs? here is a before/during/after set of videos https://www.youtube.com/watch?v=DC9zZGPFyE4&feature=g-upl https://www.youtube.com/watch?v=iDbcQ-O14wA&feature=g-upl https://www.youtube.com/watch?v=7Z9vyrbtQI4&feature=g-upl as you can see with the 'during' ... the fuel is pretty nasty and black do you think that the carbon/soot/gunk deposited on the glow plugs and made them inoperable? i cannot remember if the GP light worked before starting the 300SD after the purge or not ... but the car was definitely warm after 45+ minutes of revving to burn through two cans of purge. never stop learning. geoff
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#2
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No, a purge won't kill your plugs.
A GP light on the dash, or not, is not a good indicator for "good" GP's, it can give a false impression about plug condition. Best way to test a GP is pull it, put it on a cement garage pad, attach booster cables to it and the battery. If it doesn't glow at least yellow hot in about 15 seconds (and your battery is good) get a new GP for that hole. Maybe your GP relay is bad.. not making a good contact. Then no GP's get power. This is also the thing that feeds the indicator light on your dash. So get your volt meter out and hook it up to each individual output of the GP relay (with all GP's disconnected) and do a glow cycle from the key - but don't actually start the car.. each output should read battery voltage. When you actually connect the GP's to the relay you can test voltage again and will be somewhat lower because it's a lot of battery power sucked up to glow those babies. If all that's fine, and you don't have an indicator on dash, check that bulb.
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Cheers! Scott McPhee 1987 300D |
#3
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Quote:
but for how dark that fuel was, it ought to run a whole lot nicer now. i'm sure you'll feel more power and get better mpg's. diesel purge really works well to clean these fuel systems out. i do a can every 30k miles as routine maintenance. |
#4
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You can run straight ATF (dexIII) as fuel through the IP and it cleans it just as well as purge. I think some purge brands are just relabelled ATF anyway... just speculatin' on the red color similarity.
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Cheers! Scott McPhee 1987 300D |
#5
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Why not send 12 volts up the wire to the GP light and see if the lamp actually works?
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#6
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X2
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![]() 1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership ![]() |
#7
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.
you also dont have a cigar hose..cccc.. ![]() .
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w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD ![]() next wish/project: w114 coupe OM603 powered |
#8
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Quote:
on the relay. Also could it be tested by resistance...0 or 1...? just curious.... .
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w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD ![]() next wish/project: w114 coupe OM603 powered |
#9
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Quote:
Using a multimeter set on ohms, test each plug.
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83 SD 84 CD |
#10
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Jump 1 and 3 on the small connector to test the dash light. Key in pos II (normal running position).
The flow is +12 from fuse -> pin 1 -> internal gp relay contact -> pin 3 -> bulb -> ground in cluster.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#11
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12 volts to terminal three should illuminate the lamp.
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#12
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glowing results
Quote:
i maybe had a few too many barley pops trying to solve the mystery last night... anyway, pins 1 and 3 are the bulb light. red/black (?) and white/blue on the relay-side that is connector 15 and 'LA' ... Quote:
the lamp is fine ... so i can cross that off my mystery list. also, my purge was moonshine clear ... not red!? FYI, the reason i thought the purge may cause the failure is because of all the soot and gunk it was dislodging from the injectors and injector pump. before that makes it back to the filter (where we can see it) some of it gets injected past the prechamber and into the cylinder. my brain was thinking that maybe there was so much gunk, that it could have build up on the plugs and caused a fault. now ... back to your regularly schedule program.
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#13
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thanks mate
.
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w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD ![]() next wish/project: w114 coupe OM603 powered |
#14
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yes it does light it up ... very nicely i may add!
cheers g
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#15
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As was mine, when I did it in August. I think that comment was meant for Marvel Mystery Oil, which some folks use in the fuel system as a tonic.
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![]() Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22 |
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