Hi. My 93 W250 after sitting for about 6 months started occasionally misfiring and then dieing. After cooling off it would restart and run fine until it decided to do the same thing again. The last time it did that it would not restart. I've replaced the cam sensor, spark plugs, plug wires, distributor cap and rotor button. It has me stumped. Any help will be appreciated! Thanks!

 

Getting power to the coil? You will only see it for about 3 seconds at initial key on, after that, PCM needs to see the engine turning.

 

Thanks! I will check and get back to you.

 

Well I checked it and there is 12 volts to the coil. It only stay on for a split second but the coil is getting 12 volts to it.

 

That's the problem....

Do you have power while the engine is cranking?

 

I will have to check that tomorrow. Sorry but I got tied up for a while and then it started raining. I'm assuming that you mean 12 volts to the coil while the engine is cranking? I will check tomorrow and let you know. Now before it got to where it wouldn't start, it did have 12 volts to the coil and it stayed for about 3 seconds. Thanks!

 

What? Don't wanna work outside in the rain??? C'mon man, where is your sense of ADVENTURE!!!

ok. I don't work outside in the rain either.....

Yep, should see 12 volts at the coil, engine cranking.

 

Well I had to charge the battery. I charged it up to 13 volts and it showed a little over 12 volts to the coil and when I started cranking the engine it was showing 9.1 volts. It was cranking really fast, like it should. When I stopped cranking, I checked the battery again and it showed 12 volts.

 

Are you getting spark?? Test from the coil, and also at one or more of the plugs.

 

OK, I'll do that tomorrow. Thank you for taking the time to help me.