how do u diagnose CEL for 90-91 integra?

i searched… nothing …

im checking for codes and redo my timing. can someone help?

Search harder.

http://www.g2ic.com/tegtips/engine/13.html

Countless threads on this.

there is no shorting a connector needed?

how about using a timing gun? do i need a diagnose terminal to be shorted?

You will need to short (jump) the connector before adjusting the ignition timing with a timing gun. Also remember that the idle must be at 650-700rpm when adjusting.

Do you even know what you’re doing?

i more familiar with obd1/2…

also more with Toyotas…