How to prepare emisions test ?

mshen

How to prepare emisions test for used car?

Please help me.which parts have to change before test.

Thanks

林师傅

Actually there are already many posts on this topic, you can just search the forum. Generally, the emision includes HC, NO, and CO. Cars that can't pass emission test usually has high HC reading. To void this problem, you can chang your sparks/cables, do some carbon cleaning, that's the cheapeast thing to do. You can also use higher grade gas and add some additive to your fuel. After couple days of running, your car will have a better emission test result.