Date registered: Oct 2012
Vehicle: Mercedes Benz W108 - 280 SE (1970) / Mercedes-Benz W123 200T (1983)
Mentioned: 0 Post(s)
Quoted: 13 Post(s)
W108 M130 Misfire on seemingly random cylinders
Hi again, Benzworld.
So I have this intermittent misfiring issue. My mechanic originally changed the spark plugs to Bosch W7DC0 back in April which caused a massive misfire (loads of pinging, etc). He fiddled with the spark plug boots and that made it run properly again for around that time. Fired it up a few days later and it ran on 5 cylinders. Thought it was probably the plugs not working correctly, so I changed them out to NGK BP6ES. Then it ran perfectly fine for another day. Fired it up a few days later and it'd misfire again, just not as bad (still driveable, but you can feel the car is not firing properly).
What does this sound like to you people? It seems to do this randomly, though I've not been able to make it run without misfiring for the past 3 times I've started it. It'll hold idle just fine and it fires on all 6 cylinders. It also fires on all 6 cylinders when driving, but it sounds like it's misfiring on one or more cylinders.
Note: I've changed all HT leads, rotor and cap today and it still misfires. The only one I have not yet replaced is the lead going off the center of the cap and to the coil, it apparently didn't show up on the desk today. I've not cleaned the points since I have electronic ignition (is there something I can clean underneath the rotor, even with electronic ignition? I totally forgot to check!) I'll buy it and replace the center lead once it's here.
Last edited by Jackpody; 05-18-2015 at 01:09 PM.