BenzWorld Junior Member
Date registered: Nov 2011
Vehicle: 02 c320, 99 C43, 90 560SEL, 67 280SL
Location: California, I80 foothills
Mentioned: 0 Post(s)
Quoted: 5 Post(s)
Its not a big deal for an electrician or a mechanic with electrical wisdom. Actually it is simple wiring repair. Your friend probably just did something backwards, or left something poorly connected. The injectors are low voltage high current, so connections must be good. The wires are color coded: brown to brown, red with yellow stripe to the same, etc. There is only 4 connectors with 2wires each, only 8 wire connections. Probably a bone head stupid mistake.
I had a similar rip-off with a BMW (sorry, I'll never buy a bmw again.) The connectors were not well sealed, (unlike a MB) and water could sneak in to connections, corroding them. That gives you a loss of current through the connector. Earlier, I found an oxidized O2 sensor connector, carefully cleaned it, silicone greased it: problem solved and filled with connector sealing silicone grease, no way for water to get back in
The engine would cut out and I trouble shot it to gas and maybe the injectors because everything else was working well. I gave up due to time and brought it to a bemer guy. I told him what I had done and hoped he would start where I had left off. Oops, he fried me. He repeated everything I did plus wires, plugs valve adjustment, amateur trouble shooting or customer gouging. He found water had gotten into the injector connectors, (Maybe just one, and my fault, I had hose cleaned the motor to find oil leaks.)
He swore the only way to fix it was to replace the whole harness about $800. $2000 later, I realized he could have just cleaned the connectors and silicone greased them. But he wouldn't make any money on it or have the fun of replacing plugs, plug wires, a new air box, and me paying for his day of play time. Hope this give you encouragement.