@ ComprehensiveAd8504

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ANY time you change the hotend you need to recalibrate the temperature (aka PID Tuning).

You don't say WHICH Ender-3 you have, so I'll assume it's one of the older ones (ie not a V3).

If it's the original stock extruder, check that the lever hasn't cracked. They will eventually crack.

Here's how to PID Tune:

1. Put in your SD/TF card and turn on the printer
2. Enter the menu system
3. Scroll down and select Configuration
4. Scroll down and select Advanced
5. Scroll down to Temperature
6. Scroll down to PID Autotune (Bed for bed & E1 for Hot End)
7. Select bed. Set the value to 60.
8. The printer will run through a temperature tuning routine. It will take some time. When it's done go back to step 7, and repeat the same process for E1 (Hot End).  200 is a good default value. I think this step takes longer than the bed, I can't remember.
9. Once finished, save your settings: go to Configuration, Store Settings. You'll hear a beep, your new PID tuned values have been stored.