94 Metro can't read codes. need help

[cpunet]

Have a 94 Metro 3 cyl 1 liter. It started missing and back firing for a few minuites then ran ok home. The idle was too high so I shut if off and on 2 times and on the 3rd time it would not start. Can't read the ECM codes. When I put the fuse in the test port of the fuse block, turn on the key, the Check engine light will not even light to show a bad ECM. NO Check engine light at all. I can get the car to start while fuel is dripped into the throttle body. Will a bad computer cause this "no Check engine light" when trying to get codes? Or is it a power to the computer problem or will a shorted sensor cause this?

[westsidex]

I think your ECM wiring harness has come loose. A bad ECM turns the light steady on when the diagnostic fuse is inserted. Sounds like the engine isn't getting any data from the computer and cannot run properly.

[mcalvo]

Cpunet (and other metrobrothers)

A really good link. Try these manual test to see what you get.

http://www.seanster.com/scantool/ecm-codes.html

Hope this helps you out.

MC

[geozukigti]

A check engine light will come on only if a sensor is giving out readings that are out of range, or not at all. If you have a bad injector/bad cap and rotor or anything like that, a check engine light will most likely not come on. Make sure your fuel pump is ok, no vacuum leaks, or anything like that. If you had a high idle, then it puked, you may have a bad injector, or a bad vacuum leak. Possibly a clogged fuel filter.