I'd like to offer some insight concerning wiring harness issues/dealer service depts. If I get a ten year old car in with any kind of running complaint the first thing I check is the wiring harness. Contrary to much of what I've read in this Forum, the M104 powered 124 is NOT the only vehicle affected by faulty wiring harnesses. I've seen 140's, 202's, 210's, and 129's with 4, 6, and 8 cylinder engines have the same problems. In my opinion ( and in my shop ) once a faulty harness is discovered the client is informed that the harness needs to be replaced and then the vehicle can be re-evaluated for any other problems. The majority of the time the new harness solves the problem, but it's not uncommon to find something else that needs attention after the harness is replaced. I've seen Mass Air Flow sensors that were damaged by shorted wires. I've seen a few engine control units damaged as well. I've had clients drive their cars with all kinds of minor problems until a bad harness forced them to get the car checked out. Afterward, they sometimes don't understand why the car isn't perfect since they just spent big bucks. I wouldn't waste a tech's time or a clients money trying to troubleshoot a car with a known problem. I think Mike's service advisor made a mistake if he told him the car would be fixed after replacing the harness. As far as replacing injectors for a cold-start problem? That sounds like a guess to me, but like I said in my previous post, sometimes you have to try something and see what happens. Of course if it doesn't work I wouldn't charge the client!

Now back to the question. I've never had any success trying to repair throttle actuators. The electric motor weakens with age and has a hard time overcoming the tension of the return spring. If it was my car, I'd certainly try to fix it before spending that much money. Good luck