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  #1  
Old 03-23-2003, 12:11 AM
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1973 450sl rough idle,HHELP!!!!!!!

I am going nuts trying to figure this out. Car starts and idles rough and loud for about 6 minutes then she smoothes out with a good idle and is quiet. This happens every day. Every mechanic I have taken her to doesn't seem to feel It's aproblem. Is this normal for a car this age. I need HHELP

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Old 03-23-2003, 01:47 PM
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does this happen on only cold starts? what are hot starts like? If you really want some good feedback (not saying that this isn't good...) post on the sl board on this website.
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Old 03-23-2003, 05:49 PM
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1973/450sl cold start rough idle

The cap, plugs and wires were changed three months ago. I have only put 600 miles onthe car since then. Note she starts and runs nicely when she is hot. Idles cold at 1200 rpm and rough,after about 6-8 minutes she drops down to 800 rpm.thanks
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Old 03-23-2003, 08:57 PM
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the car will automatically keep the rpm's up for a little while so the car can warm up, when the car is warm, it drops back to normal idle RPM (700 or 800).
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Old 03-23-2003, 09:23 PM
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1973/450sl cold rough idle

To MPNY, Are you a Forum editor?
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Old 03-23-2003, 09:25 PM
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1973/450sl cold start rough idle

Correction! To MPNYE,Are you a Forum editor?
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Old 03-23-2003, 10:21 PM
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more info please...
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1999 F350 Crew-Cab with 5th Wheel Trailer Good 'ol Bass Boat (no-name..flea market special)

1992 Dodge Grand Caravan (don't laugh it has never let me down)

1987 Buick Grand National GNX (sitting right will she will be sitting for many years to come!)

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Old 03-23-2003, 10:30 PM
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Have you checked all of the basic, ie plugs, wire, cap & rotor, correct ignition timing? If all of that is status quo, then check fuel pressure when the engine is hot & cold. Check manifold vacuum for any leaks. If you supply us with more info as requested, we can help you. Without any specific info, we can only run down the basic and take guesses. Checking the above items is not expensive and they have to be up to par in any case.

Is your car a U.S. car or a grey market car?
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1999 F350 Crew-Cab with 5th Wheel Trailer Good 'ol Bass Boat (no-name..flea market special)

1992 Dodge Grand Caravan (don't laugh it has never let me down)

1987 Buick Grand National GNX (sitting right will she will be sitting for many years to come!)

1982 Buick Century V6

1986 Dodge Daytona Shelby (sold)

1968 Unimog 404
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Old 03-23-2003, 11:51 PM
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I think the 73's were injected with D-Jetronic... I believe they updated to K-Jetronic in '77
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Old 03-24-2003, 12:33 PM
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hahaha... I'm gonna piss myself laughing at your inexperience. (where's that sarcasm smiley?)
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  #11  
Old 03-24-2003, 05:58 PM
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there's no ECU on these
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Old 03-24-2003, 06:03 PM
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I have no clue what you just said.
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Old 03-24-2003, 06:09 PM
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again, you leave me in a sense of confusion. can anyone else tell me what he is trying to say? learn me somethin????? is that english??
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Old 03-24-2003, 06:13 PM
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Are you trying to be sarcastic and tell me there is an ECU in the 450SL??? I could be wrong, but I don't think I am. I just have no clue what you're trying to say.
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  #15  
Old 03-24-2003, 06:19 PM
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Electronic Control Unit. I have replaced the ECU on my brother's and his girlfriend's car. I'm not stupid. I don't think there is an ECU in the 450 because I have a 450SL, it's mechanical fuel injection, and it's an old car. Don't assume I don't know what I'm talking about if you don't know anything about me.

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