89 not running when warmed up

[rsteve503]

89 manual, starts and runs fine until a few minutes after reaching operating temp. I replaced the engine coolant temp sensor but still does it.

Any ideas?

[brickdog2000]

Maybe something to do with the carb or the choke.

[WmWatt]

You don't say how it doesn't run fine. Couple of possibilities:O2 sensor kicks in when engine warms up. Ignition control module inside distributor can become heat sensitive. Ignition control module should be set in dielectric heat transfer paste. Can be tested for free at some auto parts stores.

[FestYboy]

O2 will NOT cause the engine to stall. i would look into the ICM, and i would also look at fuel pressure/flow. could have vapor lock if there isn't enough bowl pressure.

[rsteve503]

Thanks... I'll work on it. It reacts suddenly, with bucking and cutting out but doesnt cut out totally, but the result is undrivable.

[DriverOne]

That almost sounds like the fuel itself.

[rsteve503]

Ok, I replaced the fuel pump and filter, and it runs for about 10 min after getting to op temp, then quits. I am not driving it, just letting it sit and run.

[FestYboy]

still has spark after it quits? if not, hose down the inside of the dizzy (under the cover beneath the rotor). use carb clean then follow up with non-chlorinated brake clean, you should see black comming out if it (oil).