I have posted before--this is a new thread for what I believe to be a new problem. Previously had egr fault, also had pin 8 code 13, and pin 14 code 11. Replaced MAF with new unit, checked egr valve, cleared egr tube, replaced vacuum line that runs across front of engine, checked for other vacuum leaks. Kept getting pin 8 code 13. Replaced engine wiring harness. (painless except for cost of part-1.5 hours, easy job) Car runs better, smooth idle and smooth cruise. no fault codes after 3 days of driving. Problem now is that engine has intermittant miss at idle and under medium and heavy acceleration. Feels like ignition or spark problem. Have read threads about coil to plug connectors--could this be the problem? Does this problem reveal itself with a fault code? Any suggestions?

Thanks, this site has been very helpful.

J. M. van Swaay

I have '96 E320 (W210) which has the same engine I believe. Replacing the spark plug boots solved my similar problem. No fault code was present due to that condition. Good luck.

Yes same engine.

The spark plug resistors or plug ends have a history of that exact symptom.
When doing the harness you may have disrupted one of them.
Usually you can pull them off and see visible signs of damage or burn streaks down the length of the plug resistor, but not always. That is an easy thing to check as well as replace. plugs/wires

Thanks. I'll replace them and post the results.

J. M. van Swaay

replaced plug connectors on cylinders 2, 4, 6. Still have miss problem. Should I replace plug wires on 1, 3 and 5? (Wires are original, 178,000 miles)
Is there a way to test igniton coils?

Thanks.

J. M. van swaay

Hopes this helps someone else. Replaced plug wires--no fix. Replaced ignition coils--engine now purs like a kitten. Here's a question for those more knowledgable than I. Can bad plug connectors, and or plug wires lead to premature failure of the ignition coils. (I think I may have read something about this somewhere on this board) The reason I ask is that the iginiton coils I replaced had about 50k miles on them. The car has 178k miles. The plug connectors and wires were original