Thanks for all the help on this. It was about three weeks ago that I made the fateful decision to change the sparkplugs on my '94 e320. Replacing the wiring harness did indeed solve the problem.

The worst part - the price. With an employee discount at my company, I was able to get the engine harness for about $800 including Massachusetts sales tax.

The best part - The job is a snap. Three and a half hours for a complete novice (on wiring harnesses). All the existing plug receivers were clean, and there were no challenges. In fairness, I did get a little help from a friend who traced the second half of the job, while I was doing the part from the computer to the cam sensors.

One note: All of the original wire ties open and reclose, so don't haul off and snip them (like I did on the first one).

Other than that, there wasn't even a tricky part of the job, other than to say that at it's terminous, the plastic cover to the final plug needs to be studied to figure out how to unsnap it on the fender side. That's just like these kind of jobs. One pesky, unbelievably simple thing at the very end holds you up for what seems like an eternity, but in actuality was probably only five minutes.

There are two different engine harnesses for the '94 e320. One has a different plug shape at the thermostat housing. Be sure to provide your VIN number when ordering.

Car runs great.

Mark