1994 Maxima /taps/ticks+white smoke after injector replace

[Whoisjdawg]

I have a 94 Maxima tht was missing on 2 and 4. Code said injector circuit. Okay so I replaced. After everything was put together I go to start the car and it making this loud rapid tick/tapping noise lik metal hitting against the intake. Tap the gas a little and thick white smoke comes out. Don't think it's the heads case the car didn't run hot before the repair and I'm not burning of coolant at a high rate either. Also when replacing injectors, one was a different kind than the other five. Its a good injector but different. i heard thts bad and I heard that it doesn't matter(dnt kno) but it doesn't throw a code anymore nor does it miss anymore. I think it's due to the tick/tap. Cranks perfect and doesn't die. Just tick/taps and throws smoke. Hvent put it on the street either. Please help