2003 Infiniti G35 3.5L with engine misfire and engine code P0300

Question

OK someone please help I'm a tech customer brought me her car strait from dealer, they quoted her 1200$to replace 6 injectors, digging her rough idel/running issue also complaint of burning smell from pass. the board,i fig it was electrical related, while car was running miss firing i moved wire harness on pass side by the coil packs, the misfire went away, engine ran very smooth, then i cut back insulation to expose main wiring harnees wires, immediately the white wiers with blue strip hit a ground the engine died, would not start back up, traced these white wires withe and blue strip (two sets tied to 3 more wires same color white with blue stip)to the coils, I'm thinking i fried the ecm going to look into a use one unless anyone has a suggestion or any ideas for me to look into first, also if i find a used ECM would i have to have it flashed after installing it please someone help 7 0 2 7 7 2 4 6 5 4 tony thank you

Answer 1

Yes, it's highly likely that the ECM got damaged, and yes you do have to reprogram the keys to the new ECM, the engine will not start without reprogramming the keys. Then you must make sure the ECM is communicating with the Transmission Control Module (TCM) as well.

P0300 Infiniti Code - Cylinder Misfire Detected Random Cylinders
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