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Registered
1980 300sd, 1998 e320
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73 Posts
Discussion Starter #1
My 500sel won"t pass emissions. I tried to retard and advance my timing and neither worked. It is putting out too much co
 

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Registered
1987 420 SEL
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2,090 Posts
How many miles on the MB? Have you checked your Oxygen Sensor? Also, do a search under CO or emissions here on the site.
 

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Registered
1980 300sd, 1998 e320
Joined
·
73 Posts
Discussion Starter #3
250000 miles, but I just got it so I don;t know. could be oxy sensor, but would rather make an adjustment instead of a purchase
 

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Registered
1987 420 SEL
Joined
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2,090 Posts
What prior history do you have on car?

Does it smoke when accelerating from a light or stop sign?

You will need to check quite a few things. When was the last time it was tuned-up?
Check Spark Plugs
Wires
Distributor Cap/Rotor


How does she idle? At what number on the rpm's?

Please provide much more information as possible. Thanks.
 

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Registered
1987 420 SEL
Joined
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2,090 Posts
Here is a prior post that you can take a look at. Maybe this will help.

http://www.mbnz.org/forums/forums/thread-view.asp?tid=249268&posts=26&hl=carbon+monoxide
 
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