I don't want to hijack this thread, but I am having a similar problem.
My glowplug light will not always come on on my 84 300D.
Last October or so I was having no problems starting the car, but
under the advice of someone on some forum (can't remember who or which
one.) I changed out my glowplugs as a preventative measure. It's been
all down hill since then. Immediately, the light wouldn't light when
I turned the key. If I turned it off and back on, about half the time
it would come on. It would pretty much always come on by the third or
fourth try. I'd let the plugs glow for two cycles(which sometimes
required a lot of turning the key back and forth.) then try to start.
It would work about a third of the time, but would always eventually
start.
I suspected that I didn't tighten a plug or lead enough. So I checked
them and found one plug that wasn't as far in. I took it out, ran a
1/4 inch drill bit in there to clean out any carbon, and reinstalled
it. After that the light came on with about the same regularity. Since
then though, it has become harder to get it to show the light.
Sometimes I turn the key back and forth ten or so times before I get a
light. The light always stays on for about 7 or 8 seconds when it does
come on. The car seems a little easier to start now that the weather
is getting warmer, but never fires up on the first try, even when the
weather is warm-like the 60s.
For a while I thought that maybe fuel starvation had something to do
with the hard starting, like a filter clogging up or something. But
when the car is warmed up and I shut it off to go in a store, it
starts up with no problem within a fraction of a second of turning the
key. I can see that fuel is in the filter, so it is getting fuel.
I also have big hands, and find it a real pain to get those wires on
and off and plugs in and out. It's about a three hour job. Does the
intermittent light indicate anything other than a possible loose wire?
I'm thinking that the only way I'm going to troubleshoot it is to take
each lead off and check the resistance of the plug and the voltage of
the lead. I'm just hoping that someone will chime in with some answer
that prevents that like, "this relay or inline fuse is likely blown-
check that. It's located here."
Have a good one,
Bill
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