Non-start issues and exhaust manifold - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 09-21-2006, 03:24 AM Thread Starter
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Date registered: Jul 2005
Vehicle: '68 280SE (w108), '72 280SE 3.5(w108), '88 560SEL(w126), '97 E50 (W210
Location: Cebu, Philippines
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Non-start issues and exhaust manifold

My baby refused to start the other day...the motor just turned and turned. Checked out the ignition coil and found out the resistance value was just 0.6. I don't know if this is the right value as the stated value on the coil was 1.8 ohms, so I changed the coil anyway. And the 0.4 ceramic resistor (with metallic blue band) was broken, so I swapped in one from my 126, cleaned all the plugs (which were black and sooty, rich mixture perhaps?), and swapped in a few spark plug wires as well. She started right up, but then died about 10 minutes later. Waited for the engine to cool then pulled out the plugs again and cleaned them, and she started. Since I ran out of daylight, I put her back in the garage and will wait for another day to get back to her.

I have a few questions:
1. The spark plug wires on the car had a 1k ohms mark on the spark plug end, while the ones I swapped in (3 of them) from my M130 had a 5k ohms mark on them. Would this affect performance of the engine?

2. Also, the replacement wires I used were a bit shorter than the original ones...will this affect the timing and cause other problems with the engine?

3. The exhaust manifold port beside the #8 plug seems to have a leak, since with the engine running wisps of white smoke could be seen emanating from the port, and the area surrounding it is covered with black oily soot. Anybody ever experienced this? Could this be a leaking exhaust manifold gasket? If it is, can I do the work myself? I know my way around my toolbox fairly well, but I'd like to know if there are any hidden surprises.

4. What is the right size plug to run in my car with a M116.980 (3.5 v8)engine?

Thanks for any advice you folks can give me.

'68 280SE (w108)
'72 280SE (w108) 3.5
'88 560SEL(w126)
'97 E50 (W210)
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