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Old 03-23-2010, 02:48 AM
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whunter whunter is offline
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Answer:

Quote:
Originally Posted by esloc View Post
So I have been messing around a little bit trying to figure out what's with a rough idle and varying amounts of smoke at startup. During the winter months I figured no big deal--at least it was starting--but now as its getting warmer the issue almost seems to be getting worse.

I did the normal glow plug checking procedure and they all check-out fine (they were replaced last fall) at about .4 ohms. The peculiar thing is that with the ignition off, the relay is getting full battery volts (~12.4) but when I turn the key to start the glow plug cycle the voltage at the relay drops to 10.4 volts, slowly climbs to about 10.9 V during the cycle and that after the relay shuts off hops back up to 12 V.

It seems to me like a bad ground somewhere, but I don't really know where to start. I tried replacing the battery ground cable but that didn't make any difference. I'm hoping someone who has also experience with this issue on an om603 knows some other grounds to check. Where does the relay ground to? The wires all just disappear back into the fuse box area.
300DT
W124.133
1987
OM603

My best guess:
Your startup smoke is in order of cost:
* Contaminated fuel, and/or possible Cavitation damage.
* Bad or failing glow plugs.
* Damaged injector.
* Injection pump timing issue.
* Out of calibration injection pump.


Glow plugs link thread All diesel models
http://www.peachparts.com/shopforum/diesel-discussion/137732-glow-plugs-link-thread.html#post1019018

Fuel Delivery:
Diesel Fuel Delivery:
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