d15b7 to d15b8 head swap ECU?

[grant0929]

I have a 95 Civic CX (d15b7) with a 16 Valve Non-VTEC head, which replaced the stock 8 valve head. Whenever I accelerate a dark smoke comes from the exhaust. From what I have read it seems like the timing may be off? Or is the ECU completely different? Any help would be great.

 

[ejclide]

you shouldn't have ECU problems. To the computer doesn't know you have two more valves. You may be burning too rich, but I would check your HG and your valve seals. That dark smoke is usually oil burning. Anyone correct me if i'm wrong, but i think that's your best bet.