1990 Eclipse - Engine Light On

Get an anlalog meter and read the error code from the diagnostic port. Long pulse = 10, short pulse = 1. You probably have multiple codes. At a guess its going to be O2 sensor, EGR or MAP sensor.

For a 1990, most of this is likely caused by worn valve guides, valve stem seals and rings adding excess hydocarbons to the exhaust.

Thanks, Stewart. Where can I find out what codes mean what?

causes

diagnostic port. Long

codes. At a guess

guides, valve stem

Thanks again.... More stupid questions ...

Where is the diagnostic port? Am I checking for 12VDC signals?

what?

This site gives instructions on making an LED code reader. If you don't want to build this, just replace the LED and resistor with a DC voltmeter that reads above 12 volts DC. The black wire goes to ground and the read lead goes to pin one (1)

The hook up instructions are here as are the error codes and how to read them.

That's great! Thanks!!

If you don't

a DC voltmeter

ground and the read

and how to read

mean