1991 Chevy Corsica Won't start after it warms up

99LOVATOCM

MEMBER
1991 CHEVROLET CORSICA
6 CYL
FWD
AUTOMATIC
230,000 MILES

If it's not fully warm it will stall when you start picking up speed. Turn it back on and allow it to idle for a minute and it drives fine. Twice, I filled up with gas and it started fine at the gas station then drove a mile, shut it off and it would not restart until the engine completely cooled. First time it happened I replaced the fuel filter, crank position sensor and while I was back there noticed the wiring was brittle on the knock sensor so I replaced some of the wiring and connector and the knock sensor. Still same problem, any ideas?
Thanks

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Do below

Next time it refuses to start don't wait for it to make up its mind-do below immediately to determine if its fuel or spark problem

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if so, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing