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  #1  
Old 02-18-2008, 03:31 PM
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Strange hard start

I had a situation with my 84 190D this weekend that seemed to fit a bad glow plugs scenario exactly. It very suddenly wouldn't fire until I ran several full preglow cycles and cranked a lot. It worked fine when we went to church, but two hours later it acted like this.

I didn't have a tester with me, but I followed standard recommendations to start it yesterday evening to get home (plugged in the block heater, ran through several preglow cycles, got a jump for extra cranking power) and it finally started and then ran like a top.

This morning I got my tester and ran through Diesel Giant's diagnosis list. Everything checks out perfectly. And so I tried to start it for the first time after sitting cold all night. It started perfectly. What the hell?!?

Here's the twist: My wife went out to the car after church before I did, and tried to start the car. She came back in and said, "The car won't start." That's happened before because she does dumb things like forget to put it in park. So I went out, ran it through the preglow, and cranked it over. And I already explained what happened. But, I didn't tell you that after cranking a bit and then popping the hood and looking things over, I discovered that the throttle was stuck wide open. My wife had stomped on the accelerator pedal while trying to start it before I came out, trying to choke it I guess...

So for about a minute, the glow plugs were on and then the engine was cranked over, with the throttle fully open. Is this what caused all the trouble yesterday, and was it just a temporary issue that's now gone? Everything seems fine now, but I'd like to know what happened and if anything was potentially damaged.

Thanks for any thoughts,
Jason

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  #2  
Old 02-18-2008, 03:47 PM
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I would replace the 80 amp strip fuse no matter what it looks like. I have never had an "intermittent" problem with a single GP but maybe it happens but next time it wont fire up check the continuity of each plug again. Then maybe its the relay.
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Old 02-18-2008, 03:58 PM
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I concur, intermittent glow plug problem. 80amp fuse would be first thing I'd check also.
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Old 02-18-2008, 04:37 PM
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If it was me would ask my Wife during this testing period to let me start the car when ever possible. I do not know what my Wife is thinking of when she starts a car; but she cannot accurately tell me what happened or even what she did if the car did not start.
Until you find out what is wrong it is best that you be the one who starts the car.

When I first got my Mercedes I parked and left it in Drive. When I came back it would not start (it was also night and cold ). After a trying time to find a pay phone that worked I called AAA. The tow truck came and I went to make sure it was in neutral and realized that I had left it in Drive and that that is why the car did not start. I was to embarrassed to tell the tow truck driver that I had screwed up. When I got home I put it in park and it started fine.

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Last edited by Diesel911; 02-18-2008 at 07:50 PM. Reason: add text
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