PeachParts Mercedes-Benz Forum - M104, 95 E320 "Missing" or Rough running

PeachParts Mercedes-Benz Forum (http://www.peachparts.com/shopforum/)

- Tech Help (http://www.peachparts.com/shopforum/tech-help/)

- - M104, 95 E320 "Missing" or Rough running (http://www.peachparts.com/shopforum/tech-help/219192-m104-95-e320-missing-rough-running.html)

http://catalog.worldpac.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=2EI1B4MYE2EK12P51I&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1996&product=F1010-84561&application=000357357

Stubbies.

Altough I have never heard them referred to as such..

If you change them every few years , you might not need coils.
Most Techs change them with every plug change b/c they know what a problem they can be for misfires on a Waste Spark system.
Just the ones under the coils.

Most owners change the plugs and leave the old connectors on the coil , when in actuality, it is usually the connectors that are the problem and should always be considered the first suspect on 104 engines w/DIS ignition systems.

I"m reviving an old thread by saying that I have a 95 S320V with the same problem. My first order of business was to check the spark plug gaps, and see how she runs tomorrow. If still missing, I'd probably do new plugs and wires.
Interesting thing is, that when I restarted the car (just shut off and restarted) it was almost gone......
I might start a new thread on this problem.....

Quote:

Originally Posted by Jim Villers (Post 1824424)

<SNIP> I tried testing the coil with my inductive timing light. I should have done this before but I kept putting the cover on before I reinstalled the air duct and then it was too late.

The results were not what I was expecting. With the pickup over the plug wire from the coils, the "bad" coil flashed but appeared to flash at about half the rate of the other coils and not consistent. I had expected that the bad coil would not flash at all. I can't imagine why a "bad" coil would flash at a different rate; either it should flash or not. <SNIP>

FWIW, I used the inductive timing/strobe light (hooked to coil output plug wires #1, #3, #5 (seperately) ) to find the bad coil, which flashed both slower than the good coils (half the rate?) and intermittently.

For kicks, I hooked-up the inductive timing light to the coil input wire, and it flashed at the same rate as the GOOD coils' output. I'm thinking this would be a good test to see if the coils are receiving a good input signal and if it is a wiring harness issue.

:-) neil

I, too, found a bad coil pack on a '95 E320 with NO apparent codes with the homemade reader. Used the ignition timing light tip -- mine flashed on the good ones, did not on the bad -- to isolate the bad coil without swapping.

I know it's only OBDI, but it has defective ignition coil codes...hmm?