Quote:
Originally Posted by pmckechnie
I am just going to relate the times I have had this problem with my 500SEL.
1. Found someone (Maybe me) used a coil wire that had resistance in it.
Probably just something lying around.
2. Found a oil fouled plug. Not completely, just some.
3. Used Bosch plat plugs with resistance. Did this on a bet that it would
cause a missfire at idle. I won the bet.
I have replaced the coil wire with a new correct one. Replaced the valve guide seals.
Installed NGK BP5ES non-resistor plugs. Now I have to keep checking the tach when at a light to make sure the engine is still running.
The above things didn't come all at once but one at a time over the last 5 years. I know vacumn leaks can also cause this problem but seems you have ruled out that. Just make sure you are using NON-resistor copper core plugs, Solid core wires with the MB resistor ends called for, and you should be able to get rid of this problem. Good luck.
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I am using OEM Bosch H9DCO's which are the proper non-resistor ones. This problem is somewhat more complex as this misfire has happened to my guess, for probably anywhere from 20,000-40,000 miles(I have personally done 15k of that myself) as the past 2 owners spent several thousand dollars at the shops getting the injectors done, suspension, and other things and thats why I got the car so cheap because they were sick of having the thing misfire and stall randomly (we fixed the stalling with a new OVP and valve stem seals).
My ignition wires are the Bosch ones found on MBShop
http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=28018N5L828H0P5I3M&year=1988&make=MB&model=300-TE-001&category=F&part=Ignition+Wire+Set
So sick of the car shaking every damn time I step into the car. It's so frustrating that I haven't been able to fix it. The Mercedes Repair shop that I handed it to diagnose the problem basically was a waste of my money as the guy said "in my professional opinion you should leave the car alone as it could be too many things and would be expensive. The car runs great so I would leave it alone.". Well thats great huh? I wanted to know what it could be, not that I shouldn't fix it.