1968 280SE Sedan - New Member Questions - Page 2 - Mercedes-Benz Forum

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post #11 of 16 (permalink) Old 12-01-2012, 09:24 AM
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Date registered: Jun 2007
Vehicle: '70 280S-'73 450SLC-'81 380SL-'84 500SEC Euro-'92 300SL24-'95 E320
Location: Northcoast of Ca in Eureka
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Originally Posted by Doc Vegas View Post
I am still having trouble getting it registered. Mainly my issues with finding time to wait in line at DMV for the fourth time.

One issue I have noticed is that it smokes pretty bad on moderate - hard acceleration. I assumed it was just old gas, but I am on the second tank. Any ideas? It does not smoke at all on idle, and I cannot see any evidence of smoke during slow acceleration.

I have a '70 280S, same colors even, and it also smokes. As you describe your issue you may get away with just replacing the valve seals. I had this done on mine, reduced the smoke but still not acceptable to me. next step would be valve guides or a rebuilt head.

1973 Mercedes 450SLC (PineGreen/MahoganyLeather)
1981 Mercedes 380SL FORSALE (LtIvory/PalominoMBTex)
1984 Mercedes 500SEC Euro (040Black/BlackLeather)
1992 Mercedes 300SL-24 Signal Red/Black Leather
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post #12 of 16 (permalink) Old 12-01-2012, 09:51 AM
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Date registered: Aug 2010
Vehicle: '84 Euro 500SE, '85 Euro 2.3-16, '51 Euro 170S, '97 Jeep Wrangler Sport, '15 G63 AMG
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California likes to assign VINs to imported cars that differ from the actual VIN. If they did that, there should be a plate riveted to the body where it shows the CA-issued VIN.

VINs were standardized in 1981, so it's not going be a 17-character number anyway.

Good luck getting the registration sorted out!

When was the fuel filter replaced? Have the injectors been checked as well? Valve guides and seals?

'85 Euro 190E 2.3-16
'84 Euro 500SE ~100k miles
'51 Euro 170S *Being reborn*
'97 Jeep Wrangler Sport ~42k miles
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'09 E350 ~51k miles
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post #13 of 16 (permalink) Old 12-01-2012, 07:18 PM
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Date registered: Apr 2012
Vehicle: 1982 mercedes 300d turbo diesel
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nice car

wow I would love to own a car like that, I have my hands full with my diesel.. nice ride I hope you get to register it n drive it.
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post #14 of 16 (permalink) Old 01-27-2013, 10:25 PM Thread Starter
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Date registered: Nov 2012
Vehicle: 1968 280SE & 1999 CLK 320 Cabriolet
Location: Tucson, Arizona
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Finally!!! I got it titled in AZ after three trips to DMV and hours of time. I am driving it legally for the first time. I have a 30-day temp. tag, so I need to get it smoged (wish me luck, it smokes pretty bad on hard acceleration). Then, when it passes, I can get a real plate and roll.

I think it is running rich, so I will try to lean it out a bit. It was at sea level when I bought it and we are around 2700 feet here, any issue?

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post #15 of 16 (permalink) Old 01-28-2013, 09:25 AM
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Sounds like the valve guides and seals need replacement. Otherwise it's bad piston rings.
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post #16 of 16 (permalink) Old 01-28-2013, 12:18 PM Thread Starter
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Date registered: Nov 2012
Vehicle: 1968 280SE & 1999 CLK 320 Cabriolet
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I surely hope it is not rings... It had old gas in it when I got it, but I have been through two tanks of fresh fuel + one can of Lucas injector cleaner... still smokes, but does seem better.

Sadly, as expected, it failed smog this AM. The hydrocarbons (HC) in pp, were 1062 Precondition (standard is 380). Final reading was 670 (I think for idle and the standard is 450). The Carbon Monoxide (CO) in % was 5.99 and 6.95, but the standard is 5.0. The precondition CO was 11.49 and the standard is 3.00. I think the precondition is when you hold it at 30 MPH on the "dyno" looking thing... I had a very hard time holding it at 30 MPH, so I was in and out of the throttle a lot - which I predict made it worse.

Any ideas?

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