My '85 300D still has the glowplugs it came to me with, almost 2 years and 23,000 miles ago. The '87 came with one bad one, since replaced, but it doesn't get driven much so I don't have good data. Our new E300D has service records showing glow plug replacements several times (in 248,000 miles) and one is bad now, replacement on order. All six were replaced 2 POs, 3 years, and 45,000 miles ago. Late model preglow controllers with afterglow probably are harder on glow plugs than the earlier kind that shut off as soon as the engine cranks. Anyone have experience with these? Late W124, W210, etc.
Quote:
Originally Posted by oldnavy
What I have been wondering from time to tie over the years is if the GP go bad will they eventually damage the relay or vice versa. Anyone know?
|
Glow plugs have low resistance (typically 1 ohm) and draw a lot of current (so they get hot). If one short-circuits, it will draw even more current but that should blow the strip fuse rather than harming the preglow controller. I'm sure there's a way for a bad glow plug to harm the controller, I just don't know what it is.
Jeremy
__________________
"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles
Wife's car
2005 E320 CDI . . 113,000 miles
My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970