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Old 06-11-2002, 12:30 PM
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low rpm shudder and stall 450sl

My 450sl has always idled a bit rough but now it stalled completely at a red light. I replaced the plug wires and plugs less than 10,000 miles ago. I adjusted the timing to its correct spec now it runs worse, so bad that I had to advance the timing to get it to idle at all. The distributor cap contacts look pretty worn but no cracks so I ordered a new cap and rotor. Are there any other components to look at that may be causing this such as emmisions components. I've read these engines are notoriously rough idling. Is this all I can expect. Also, before this the car when first sarted took about 3-4 minutes to idle down from ~1400rpms to 750 rpms. Is this normal?

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Old 06-13-2002, 07:32 PM
Mark Herzig's Avatar
Registered User
Join Date: Apr 1999
Location: Austin, Texas
Posts: 380
it may be getting too much air. The auxillary air valve is supposed to shut once the coolant reaches a certain temperature. When warm, it does not allow any additional air in. Maybe is is not closing all the way. When warm and idling rough, try pinching the hose off and see it that makes a difference.
Mark Herzig
1995 E300D 153K
1985 300D 142K (sold)
1979 450SL 122 miles (sold)
1992 500E 127K (sold)
1987 300SDL 132K (sold)
1986 300E 161K (sold)
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Old 06-14-2002, 08:32 PM
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My car would stumble and almost stall when accelerating from a stop. Problem was a cracked vacuum line.

'79 450SL
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