Just looking for a 2nd opinion. The glowplug dashlight goes on and off like always, however the car won't start.

I'm getting voltage to the glow plugs. But I wasn't able to perform the amp test. Is there anything else that might be causing the "no start" besides the relay.

This problem happened over a couple of days. One day it was hard to start the next nothing.

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84 300D 251K
87 190DT 281K - Sold
06 Ford Escape 172K
94 Ford Ranger 250K
99 Chevy Suburban 181K

I'd suggest a voltmeter and the service manual. Service manual available on CD from here. Buying stuff keeps this "free" web site going.

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daBenz - 1970 220D

rderton,

If you have voltage to the GP, the GP relay is working OK. How long did you wait for the GP to heat? Try waiting for 30 seconds the next time the engine is hard to start. If it starts easily, problem solved: the timing of the GP indicator is out of calibration. Just wait longer for the GP GP heat each time.

If it still doesn't start, do a resistance test on each GP. Use search to find the procedure, key words GP resistance.

Let me know the results.

P E H

I have the same problem with my 300D right now, it will not start. I have narrowed it down to the glow plug system. I have tested the resistance across the plugs themselves and they test ok, so I am guessing the plugs are good. The glow plug light on the dash does not come on but did last week. I have noticed that when I turn the key, the light does not come on, but after about 30-45 seconds I hear a click comming from the glow plug relay(the black box on the driver side fender well). I have also tested to see if the plugs are getting voltage which they are. I just ordered the OEM glow plug relay from the MB dealer for $130, and the fuse as well for $.95(figured I'd get it just in case). I will be installing it tommorow morning and will post on how it goes.

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1980 300D European
"The Red Fox"
200,000 miles

2003 Chevrolet Silverado

609 Certification

Well, I installed the new glow plug relay today, check the resistance and voltage on the plugs and it was good, but it will still not start. I am stumped. I know the battery is good, the starter is about a month old, glow plugs are good, new glow plug relay. The next thing I believe I should check is to see if the fuel is getting to the injectors and the injectors are not clogged, but besides that any suggestions??

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1980 300D European
"The Red Fox"
200,000 miles

2003 Chevrolet Silverado

609 Certification

on my car replacing the plugs solved things with a 300cd 1983 that was difficult to start when cold. I kept the same relay.

See my other post about where to buy and how to put in the plugs
search "glow plug tip"

Mark

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1983 300CD 245K
Running WVO blends

Well, the glow plug relay cannot be the culprit because you measured voltage at the glow plugs. So, it's ruled out (and could have been ruled out prior to purchasing a new one).

Please provide a detailed explanation of how you have concluded that the glow plugs are good.

When the dash light starts doing funny things, normally at least two glow plugs are not working properly.

I would not proceed to look at other reasons for failure to start until the glow plug system is functioning properly, and this includes a properly working indicator light.