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Hi there,
Got a cyl 1 misfire with corresponding code P0301. Spark plug is getting black and the car is running like subaru. Swapped plugs - code is not following, checked & changed plugs - same as before. Swapped coils - still the same, swapped injectors - same. Changed injectors towards other set - same. Checked Ecu - installed on other car - it runs flawlessly. Checked wiring - put separate wires from ecm- same as before. Checked vane ring on a crank - also ok. Checked vacuum stuff - all ok. Changed sensor ( crank angle & maf ) - still the same. Compression and leak test are ok. Checked intake manifold and fuel rack - no issues. Just assembled the engine, 700 km after assembly. Misfiring at idle mostly, above 3000 rpm gets better. Checked tappets - also ok. Engine is running rough, but i’m On id1000 and sgc2. Help))))
 
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