BenzWorld Junior Member
Date registered: Dec 2006
Mentioned: 0 Post(s)
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I have had spark plugs work fine on a bench test (not under compression) and not fire in use.
Try to remove another plug and swap with #2. Then try to swap wires between the two plugs.
If you can swap wires without change, you know it is the plug or cylinder. If you can swap plugs in cylinders and the problem moves, you know it is the plug.
Have you inpected the distributor cap? Does the contact inside the cap or under the wire have damage or corrosion?
Can you buy a plug (or new cap) where you are? Do you have any used/ spare plugs?
I do not think you will have a sudden failure of fuel system, valves or compression. The problem is likely wires or plugs.
1973 280 W114 (Driver - 140,000 miles)
1974 280C W114 (Now running - driven off and on this summer)
1968 200D (Engine rebuild planned)
1964 200 (gasser parts car) & 1966 200D (complete car - Got to run. Now to see if clutch can be repaired.)
1980 300D W123 (Parts car - engine runs, but trashed)
1981 240D W123 4 speed ( In sad shape when bought - many parts from '80 300D has back on the road. Needs work, but shows promise.)
1988 300TE W124 (Does not run. 180,000)