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  #1  
Old 05-29-2001, 11:41 PM
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Join Date: May 2001
Posts: 145
I'm reaching the endpoint on the refurbishing of this old 1969 280SEL so when I noticed that it seemed to lag a little at low RPM I decided to check the plugs and then advance the timing a bit. All the plugs checked out except #4 which was a little wet. I then advanced the timing 4 degrees or so and test drove it. The difference was amazing. Lots of pep and good acceleration. I think I'll get a hotter plug for cylinder #4 just so it stays clean. What would be a good Bosch replacement for the W7 DC that I'm using right now? Any ideas out there? Thanks all.
Thom
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Old 05-30-2001, 12:03 PM
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Join Date: Apr 2000
Location: San Antonio, TX
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Thom,

On my 190SL I went to a NGK BP5 from a BP6. I believe that the BP6 is the equivalent of the Bosch you are using. Be aware, however, that a hotter plug may result in early detonation (a bad thing). However, you may have a different problem. I'd be concerned that #4 isn't firing all the time. Might want to check out your ignition, and look at putting in an electronic ignition.
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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)
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Old 05-30-2001, 12:09 PM
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Thanks. Just as you were responding to this question I submitted a new thread. I'd like to see what the others might think about this. Cylinder #4 is definitely working so I don't want to do anything rash here. Ahhh, perhaps it just needs a valve adjustment.
Thom
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