My Mercedes 1993 400e Won't Start - Previously running fine - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 10-06-2011, 02:24 PM Thread Starter
bjr
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Unhappy My Mercedes 1993 400e Won't Start - Previously running fine

Hoping someone might be able to help or provide some insight.

Car Details
1993 Mercedes 400e
Mileage: 162K miles
Condition: Very good

What happened
I was driving my car the other day for about 15 minutes, then suddenly the car started making a loud whirring noise from the engine. It sounded to me like a belt was loose. When I opened the hood as the car was running, the sound seemed to be coming from near the belt just behind the fans behind the front grill. Turning off the car made the sound stop. The belt did not feel slack when pressed.

A few hours later I had to move the car, it drove fine, but the noise continued. About 5 minutes later, the noise went away entirely. However, I also noticed that my entire air/heat system was no longer working (I had it on about 2 minutes before that). Pushing the buttons didn't do anything. I parked. Tried to turn the car back on a minute later, and it won't start at all. Turning the ignition key makes the lights on the dashboard come on for a sec, but the motor doesn't sound like it's trying to start. It's quiet.

Any ideas about what may be going on?

Thanks in advance for help. I'm lost here.

Last edited by bjr; 10-06-2011 at 02:27 PM.
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post #2 of 8 (permalink) Old 10-06-2011, 03:06 PM
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You don't hear the starter at all, correct?

Felicita e un bicchiere di vino con un panino.
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post #3 of 8 (permalink) Old 10-06-2011, 03:18 PM Thread Starter
bjr
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Correct. I don't hear the starter at all.
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post #4 of 8 (permalink) Old 10-06-2011, 03:34 PM
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1. Any abnormal gauge indications (low oil press, high coolant temp)?

2. You said climate control buttons "don't do anything". Not even defrost?

3. Do lights, blinkers etc come on and, if yes, do they function normally?

Felicita e un bicchiere di vino con un panino.
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post #5 of 8 (permalink) Old 10-06-2011, 03:49 PM Thread Starter
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1. No lights or gauge indicators were on before I turned the car off. Positive about this. Given that I can't start it now, I don't think I would know if any would be on now.

2. That's right. None of them were doing anything (again, obviously can't test this any more). Even the left-most button for forward defrost was not working. When I tried rear-defrost switch (separate from this system), that caused the light on the switch to come on, but I don't technically know if it was working.

3. Not positive about headlamps or blinkers. I would need to check this later and get back to you. Thinking about it, could I even check blinkers if the car doesn't come on? Headlamps I could surely test as it's a dial to the left of steering wheel.
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post #6 of 8 (permalink) Old 10-06-2011, 03:54 PM
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Have you tried jumping it and, if yes, what was the result?

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post #7 of 8 (permalink) Old 10-07-2011, 11:12 AM Thread Starter
bjr
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Went home yesterday and took a look at a couple of things you asked about.

Headlamps, blinkers, etc. are all working properly when I turn the key to the first notch. But again, no starter noise whatsoever. Other than the usual annoying 3-second buzz which I think indicates the fuel pump is working properly?

I wasn't able to try jumping it, but if the lights are all working properly, could it be the battery?
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post #8 of 8 (permalink) Old 10-07-2011, 11:16 AM
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My guess is that you had an internal failure of the alternator (hence the racket) which caused the battery to run down and now you don't have enough juice to start it. This is why I was wondering about jumping. If it doesn't crank with a jump either, then my theory is incorrect.

Felicita e un bicchiere di vino con un panino.

Last edited by flyboyike; 10-07-2011 at 11:20 AM.
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