94 ciera 3.1 wont start warm

hi everyone. I am working on a 94 ciera with 3.1 . it will start and run great then after driving it 15 min or more it wont start. it will sputter. i had an extra module and coil pack so i put it on and it ran fine for a while. now its bad again. it seems to be a yellow spark when it wont start.
i plan on doing fuel pressure test today. but the HOT/COLD thing puzzles me.. thanks in advance for any help..................87Racer

Could be the icm or a bad crank sensor, see if it starts with starting fluid, the spark should be sharp and blue of course.

hi everyone. I am working on a 94 ciera with 3.1 . it will start and run great then after driving it 15 min or more it wont start. it will sputter. i had an extra module and coil pack so i put it on and it ran fine for a while. now its bad again. it seems to be a yellow spark when it wont start.
i plan on doing fuel pressure test today. but the HOT/COLD thing puzzles me.. thanks in advance for any help..................87Racer

What DTC codes are coming up?

Ithink your 94 is OBD1 but needs a reader tool to get the 5 diget codes. Some people call this OBD 1 1/2 ! I got the loaner tool from O'Riles to read the codes for my 95.

After you drive it for 15 minutes does it die first then not restart?

sorry i forgot to mention. there isnt an MIL light on. i will recheck to see if any codes set. it doesnt kill it just doesnt want to start when warm and if it does it seems to spark knock alot. i sprayed starting fluid in it but i didnt get the reaction i was looking for. seemed to help some but not much at all...........THANKS!!!

is there a test for the crank sensor?? i did change the icm with a used one>>>

A scanner would show if the pcm sees cranking rpms, if not that points to a crank sensor. AZ/ Napa can test the icm but of course this only shows up warm.

is there a test for the crank sensor?? i did change the icm with a used one>>>

YES!

That is a 2 wire sensor! Crankshaft position sensor 3x.

http://easyautodiagnostics.com/crankshaft_position_sensors/crank_cam_sensors_3.php

If your going to take the icm in for testing , then would be a good time to also remove the wire going to the sensor to inspect it for burning or melting of its instulation .

YES!

That is a 2 wire sensor! Crankshaft position sensor 3x.

http://easyautodiagnostics.com/crankshaft_position_sensors/crank_cam_sensors_3.php

If your going to take the icm in for testing , then would be a good time to also remove the wire going to the sensor to inspect it for burning or melting of its instulation .

Good sight, but most of the time these fail heat related, which this test doesn't account for.