Where is the diagnostic connector on a 1987 Honda Accord?

Answer 1

Short answer - there is no diagnostic port. Long answer - If you have a DX or LX model, your engine is carburated and there is no computer - period. If you have the LX-i model, then you can check the computer for trouble codes. It's located under the driver's seat. Turn the key to the "run" position (but don't start the engine), and you can count the number of times the red LED blinks on the computer to find out the trouble code. Once you have the code, you can look up the meaning online, or ask your Honda dealer to look up the value for you.