Can Your Aging Mercedes Leave a Trail of Blue Smoke a Hundred Yards Long? Well, THIS One Can!

[UPDATE: This might be a gasoline-powered 230S, if that’s even possible. My bad. If anybody in town has an unusual euro-only Mercedes, it’s this guy. It might even have a manual transmission.]

Old Mercedes diesels* might be really slow, and they might emit more particulates than a fleet of new cars, and they might get converted to run on french fry grease, but…

The most cartoonish cloud of smoke coming from a car exhaust I’ve ever seen:

Click to expand

…they will never die. 

And here’s the thing – old diesels are exempt from California’s annual smog check program.

That’s a giant loophole big enough that you could drive a big old honking Mercedes Benz diesel through.

Hurray!

I’ve only been a Benz owner for less than a year now. However, I’m beginning to think that stamping out smoke on these 616s is like trying to rid your yard comletely of dandelions – it’s a fool’s errand.

I’ve had my IP rebuilt, rolled in a new timing chain, and had the valve seals replaced all within the last 6 months. Injectors are also new and the valves were adjusted when the seals were replaced. Fuel filters and fuel lines are also new and all fluids are fresh. The only differences between mine and yours are that I have lower compression and I use perhaps a 1/2 quart of oil in 2,000 miles.

Despite this, I still have some smoke. There’s a hint of whitish smoke on cold idle at start up and a bit of black smoke when I get on the throttle or climb steep hills.

I have another set of injectors that I had rebuilt and will install them in due course. I’ll also rebuild the vacuum pump as a preventative measure. But after that, this game of “whack a mole” has to end.

There is one good thing to come from all this work, however. My engine sounds silky smooth. No knocking, no nailing, and no hicccups. The only underhood sounds you hear are the clickity click of fuel injectors popping and the combustion inside the engine. So long as this continues to be the case and my oil consumption doesn’t increase, I should consider everything else to be inconsequential.”

*Pray that this particular old Mercedes is a diesel. ‘Cause otherwise this rig prolly needs to get oil added on a daily basis…

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2 Responses to “Can Your Aging Mercedes Leave a Trail of Blue Smoke a Hundred Yards Long? Well, THIS One Can!”

  1. martin says:

    I have a worse problem, and probably unbeknownst to the guy you quoted…his problem as well. Its called a worn turbo shaft. And yes, my cloud is even more cartoonish than his. My 82 benz 300sd may emit a massive cloud of burnt oil, but the type of emissions from this beast is just carbon that drops down to the earth. You…all of us are made out of carbon. Believe it or not, even with worn rings or turbo shaft or valve seals, these emissions are still less harmfull to the environment than those emittted from a Toyota Prius. Once diesel exhaust falls to the ground, it is no longer breathable and dangerous. But a prius’s (or any gas vehicle for that matter) emissions will live on in the atmosphere to haunt the air of future generations.

  2. sfcitizen says:

    UPDATE: This might be a 230S, if that’s even possible. If anybody in town has an unusual euro-only Mercedes, it’s this guy. It might even have a manual.
    Thx for the comment!