Hello this might sound stupid but i just bought a 91 Civic Hatchback with the engine light ON . I tried to find the location of the obd1 connector so i could figure out what's wrong with it. So Please let me know where is that connector located at need help soon.
Also the car idles kind of funny i think it might be related with some sensor but i need to check that CEL. How to test and check the CEL (check engine light). the car wont pass over 3000 RPMs.

 

check your ecu..the obd0 system has an led light on the ecu..just check the blinks on that and u can figure the code...unless if u convert to obd1, itll be somewhere behind the glove compartment..

 

okay! if a have an obd1 what do i do? how to use the connectors to figure out the CEL.

 

its all on the passenger side.. the ecu should blink a red light when the check engine light is on.. its under the carpet..

and unless your motor has been swapd out and converted to obd1 then its a non obd car..

but obd1, there is a blue? plug under the passenger side dash just stick a bent paperclip in it on both sides and jump the wires together