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Old 10-29-2007, 09:03 PM
Registered User
Join Date: Sep 2004
Location: Seattle
Posts: 23
1987 420 SEL (smoke exhaust)

Now I have time to work on the car. (Divorce is Over)

I have a 1987 420 SEL. With 252262 miles on it.

The problem is that when I drove it around the block. The car was smoking like it was taking on to much fuel coming out of the exhaust. Most of the smoke appeared when I had my foot on the throttle. When I start it up to warm the car, Its starts fine and Idles good but there is little smoking from the exhaust. One place that I talk to told me that I need all the Top end seals done. Another place told me that it was a Fuel injector rotary vane problem.

Here is the facts. In Emissions testing the car failed in the

Cruise limit 150
Cruise Emissions 209 Failed

Idle limit 220
Idle Emissions 93 Pass

I passed the CO% of the test.

There is new spark plugs, Oil filter change and there is a new Replacement Oxygen Sensor
1986-1991 Mercedes Benz 420SEL
OXYGEN SENSOR -- Oxygen Sensor. Univeral Type, 2 Wire

I like to know what should I do next. I just got out of a Divorce and I have custody of my son so I have had not had any time to work on the car in till now. Any help would be great.
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Old 11-01-2007, 10:53 PM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Blue smoke is worn out valve guide seals. Takes a few hours to do, but it will cure the smoke on takeoff and after idling problem.

BLACK smoke, on the other hand, is too much fuel. However, you will fail the CO test with too much fuel, so I suspect bad valve guide seals.

You have the right milage for them to be bad. Not horribly expensive, and it will decrease oil usage to about zero.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 11-01-2007, 11:55 PM
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Join Date: Jan 2007
Posts: 154
You can live with a bit of oil consumption as it's not all that for the engine's longevity.

Also a good ole Italian tune up will help.
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Old 11-07-2007, 01:10 PM
Registered User
Join Date: Sep 2004
Location: Seattle
Posts: 23
I am looking in order recondition heads to replace them or order the parts and do them my self.

I let you know.
Thanks you all
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