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I have a 00 mustang 3.8L with 215k miles, just did an overhual, runs great, but it’s smoking a lot. Its black smoke, i change fuel filter, checked injectors and fuel regulator and they are in good shape.

its still smoking a lot, what can be causing this? My dad owners his own shop, he has that sea foam injector cleaner and it helped but now its even worse.

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Are you sure the ECT (engine coolant temp) sensor is reading correctly? Was
the thermostat re-installed? Low temperature will cause extremely rich
mixture. The ECT overrides oxygen sensor, mass air flow sensor and all other
inputs. Plug in a scan tool and see what the warmed-up temp is and if the
ECM is in closed loop before you do anything else.

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Jim O’Neill
Chino Autotech Inc.
 

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