Does anyone have any experience with symptoms of a failing lower wiring harness for a W140 Benz (1993 Benz 300SE)?

Although car runs well, am noticing an intermitten acceleration difference . . . sometimes peppy, sometimes not as peppy. Changed about every LH component associated w/ giving computer data so it can run the engine (i.e. MAF, O2 sensor, CIS sender, etc.). No fault codes are showing up on the tester.

Have also noticed that the IR does not function at times for only a few minutes after turning the engine off. I've changed the upper wiring harness years ago but noticed our forum colleagues as complaining about the lower harness with our W140 cars. I am attempting to ascertain if the IR response is somehow associated w/ the sluggishness experienced at times - potentially due to a short somewhere. Thanks.

Primary symptoms of a bad lower harness are bad readings on the oil pressure or oil level gauge. It doesn't really have anything to do with the operation of the engine, other than starter and alternator, and those wires don't tend to go bad. Actually your car isn't known for having bad wiring harness problems at all.

Dean, thanks for the reply. Car did have severe problems on the upper wiring harness which deteriorated & had to be changed years ago. The lower harness seems to be following same fate, esp. around the lower wiring close to the engine block. Noticed that the throttle actuator wiring was good though compared w/ other models (separate harness attached to the throttle actuator).