![]() |
Glow Plug Help
My pre-glow system isn't working. '83 300D OM617
This is the first time I have had any issues with the GP's. Functioned perfectly until a couple days ago. Cold starts are challenging. I fear for the life of my starter and battery. Dash light does not come on at all. Bulb is good. GP relay is getting 12V at main lead. Relay's 80A fuse is good. All GP's are getting equal power (10.9V) with key on. I can hear the GP relay click off after ~30 seconds. GP resistance thru harness shows four under 1ohm and one at 2.4ohms. What else should I check? |
Quote:
John |
I never have luck checking the GP when they are in the car. I have to pull them out. Did you pull yours out to check or check them in?
|
That 10.9V GP reading was taken just after an attempted cold start. Battery is new and strong (enough).
It starts, with much cranking and no assistance from the plugs. (Starts easily when warm.) Everything worked perfectly until a couple days ago when the dash light quit coming on. Now the plugs are not working. |
Quote:
I assumed the problem lies somewhere in the control system since they all quit working at the same time. |
Quote:
John |
Quote:
I went from 3-click cold starts to minute-plus cranking. |
Ahh, you mean the car won't start, not the GP's aren't heating. ok. I would order a full set of new bosch GP's and pop em in. while they are out, you may want to run a compression check on her. also pull the Valve cover and check the cam clearances. then report back with the findings.
John |
Quote:
|
Quote:
Wait normal glow time then cycle the key all the way off and back to glow, do you get a light then? Also: http://www.peachparts.com/shopforum/diesel-discussion/171785-brutal-start-morning-only-33f.html This thread is mine and I had almost spot on the same symptoms you are describing. One bad plug was the issue (#4 for me) A good way to test the plugs in-block is as follows: Unplug the harness from the relay, Measure block to threaded tip on each GP, should read ~1 ohm each. Then measure block to each conductor in the relay plug you removed, should get nominally the same reading. -nB |
GP resistance was checked at plug and at relay harness. 1 plug was not the same (2.4 ohms).
I have not pulled any GPs to see if they get hot. I can tell by the way it tries to start that no more than one plug is effective. Dash light does not come on, no matter what sequence is followed (bulb is good though). I am a starving student - no money to throw a set of new plugs at it now. |
Check to see if you are getting power at the glowplugs and at the relay when the plugs are activated. You could also try jumping 12volts directly to the 80 amp fuse and see if that causes them to work. If so, the problem is upstream from the fuse. But as a starving student, you could always use the jumper wire to heat them up and get is started until further investigation and parts purchase could be done.
|
Quote:
I'll try the hotwire method tomorrow for shirts and giggles. |
My 83 300d did the same thing.
No glow plug light but i could hear the relay click off after like 30 seconds. I had two bad glow plugs. replaced only the bad ones. $9.99 at auto zone Steve |
If the plugs are getting power, then the earlier poster who said one bad plug can stop if from starting should be the ruling authority on this question. Buy the plug and replace the bad one, no other choice.
|
All times are GMT -4. The time now is 09:04 PM. |
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website