Rich fuel smell...02 sensor problem?
01-03-2009, 04:50 AM
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1989 300E
Rich fuel smell...02 sensor problem?
I;m smelling a rich mixture from my exhaust, can this be caused by a bad 02 sensor? What are the other causes? I've recently replaced all the valve stem seals to cure the white smoke. I need help because I need to get this car smogged. Thanks in advance. And I get black smoke evrytime I ounch the throttle, parked or on the freeway.
01-04-2009, 04:50 PM
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1989 300E
01-05-2009, 03:24 AM
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1994 C124 E320 Coupe - 1975 W116 280S
White smoke of any kind means that it's a coolant issue. It's interesting that the white smoke was fixed from the valve stem seals.
Think of it this way. When you cause water to vaporize (the 50% of whats in coolant) it turns into steam, which is white.
When you cause oil to vaporize...or in the most direct way of saying it, burning oil, it becomes a bluish/black smoke.
However, as I just researched gray to black smoke can indicate a too rich air/fuel mixture which is from a wrongly adjusted engine, an extremely dirty air filter, or bad/clogged fuel injectors.
I don't know about the distributor though since nearly all the cars I've driven/worked on used coil-over ignition and is all ECU managed.
I'm still learning with my carbureted 280S. Maybe someone else can chip in.
Think of it this way. When you cause water to vaporize (the 50% of whats in coolant) it turns into steam, which is white.
When you cause oil to vaporize...or in the most direct way of saying it, burning oil, it becomes a bluish/black smoke.
However, as I just researched gray to black smoke can indicate a too rich air/fuel mixture which is from a wrongly adjusted engine, an extremely dirty air filter, or bad/clogged fuel injectors.
I don't know about the distributor though since nearly all the cars I've driven/worked on used coil-over ignition and is all ECU managed.
I'm still learning with my carbureted 280S. Maybe someone else can chip in.
01-05-2009, 10:34 AM
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1989 300E
White smoke of any kind means that it's a coolant issue. It's interesting that the white smoke was fixed from the valve stem seals.
Think of it this way. When you cause water to vaporize (the 50% of whats in coolant) it turns into steam, which is white.
When you cause oil to vaporize...or in the most direct way of saying it, burning oil, it becomes a bluish/black smoke.
However, as I just researched gray to black smoke can indicate a too rich air/fuel mixture which is from a wrongly adjusted engine, an extremely dirty air filter, or bad/clogged fuel injectors.
I don't know about the distributor though since nearly all the cars I've driven/worked on used coil-over ignition and is all ECU managed.
I'm still learning with my carbureted 280S. Maybe someone else can chip in.
Think of it this way. When you cause water to vaporize (the 50% of whats in coolant) it turns into steam, which is white.
When you cause oil to vaporize...or in the most direct way of saying it, burning oil, it becomes a bluish/black smoke.
However, as I just researched gray to black smoke can indicate a too rich air/fuel mixture which is from a wrongly adjusted engine, an extremely dirty air filter, or bad/clogged fuel injectors.
I don't know about the distributor though since nearly all the cars I've driven/worked on used coil-over ignition and is all ECU managed.
I'm still learning with my carbureted 280S. Maybe someone else can chip in.
And if my injectors are clogged, there is no possibility for a rich mixture. It should be leaning out. My 2 cents.
