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  #1  
Old 12-20-2002, 09:18 AM
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Join Date: Apr 2002
Location: Melbourne, Australia
Posts: 280
Question proper idle speed

Can someone please tell me what should be the normal idle speed for a 4 cylinder 1994 C180 which has a 1799c motor? Mine is doing 1000rpm at starting cold and I always thought it should be lower like 750 to 800rpm only. This is without the aircon on at all. Usually with this on, the revs goes up. It was quieter and lower rpm before I got a techie to do some work on the vacuum system(leaks in the diaphrams) and look at the exhaust system which seems to be making unnecessary noises and may have some holes or leaks.

Tomorrow he will replace the whole exhaust system to get rid of the complaint and then look at whether the engine has developed some faults in the moving parts inside(pray there isn't any more problems or I will have to unload this car somewhere!!!
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  #2  
Old 12-21-2002, 02:37 PM
Neil Richardson
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Hi Hocky.

When the engine is warm, does it still idle at 1000 rpm?
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  #3  
Old 12-21-2002, 08:13 PM
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Join Date: Jun 2002
Location: Melbourne, Australia
Posts: 80
Smile proper idle speed

Neil, the idle continues like this when hot. Any reasons for this behavior? I will try again afterwards as I have to take it out again. Its my weekend car, don't even start the motor for the whole week sometimes. Been fixin quite a "few" things in this car lately, bugger it! One moment its this, then that, then something else. Now its the exhaust replacement, then there is a thin layer of oil deposited under the motor around the oil pan, then its the 2 rear shock absorbers looking a bit leaky, then the brakes are starting to squeak a little during stops at traffic lights and the motor is getting a bit too hot in this Summer heat( the aux fans are coming on). How can I make the ride more "soft" or compliant like the Lexus, I like the floating feel. The Benz has only double wishbones in front which only have a short shock travel . Will the gas struts like Monroes or Gabriels be better?
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  #4  
Old 12-22-2002, 07:01 AM
Neil Richardson
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Hi Hocky.

Don't know anything about the suspension, mine was fitted with Sportline from the factory. Holds the road better that the other 300CE I used to have. About the idle speed, I was wondering if maybe the Thermostat doesn't work and the engine 'thinks' its still cold.

There are a lot of good guys on this website who could really give you some good advice.

I've had a few problems myself and was rescued. I'm sure it won't be long before they respond.
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  #5  
Old 12-23-2002, 06:29 PM
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Join Date: Apr 2002
Location: Melbourne, Australia
Posts: 280
Talking high idle rpm

Neil, I took the car to see my tech yesterday and the engine rpm has resumed the normal 850 or so level instead of the 1000rpm I reported a few days ago. Have replaced the whole exhaust system (wow!) and its really great now. The sound is more normal and no more of the crackling "after burning" at the end of the revs as you step on the accelerator hard. Apparently the insides of the 2 mufflers have "gone" and the old cat was welded on the pipe the wrong way around! Whoever did it should be shot! Cheers. Hope more people out there will join in the discussions about the W202s as more are into the W124s.
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  #6  
Old 12-26-2002, 07:11 AM
Neil Richardson
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Hi Hocky.

The W124 is probably better represented because it was/is such a good car, and there are a lot of them still about. German engineering that BMW VW/Audi would be proud of.

If you surf the site though, you'll find that all Mercs are represented pretty well here.

Happy Holidays.
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