90 350 tbi cuts out after a minute

texas tough said:

if the ignition module is not producing spark the ECM wont let the injectors spray. so u always want to check spark first. there is a module on the back of the distributor that fires the ignition when you first start it. then the ECM takes control over the ignition to control advance . wshen it dies, check for spark. if none, check ignition module, coil, rotor, cap and grounds

Click to expand...

1998_K1500_Sub said:

I see you said above that it "Dies" like you turned off the ignition.

Does it really cut out "after one minute or two" or is something else a factor? For example...

Is the engine coolant temp passing some threshold and, for example, the ECU's going from open-loop to closed-loop... leading to possible misbehavin'?

Click to expand...

Lou Merrell said:

Have you pulled a code?
How's your oil pressure?

Click to expand...

texas tough said:

there is a connector plug with a tan , orange or brown wire, either under the passenger side dash by the air duct, or under a plastic cover on the firewall depending on year.. if you find and unplug this connector, the truck will run ONLY off of the ignition module.. it will not advance timing correctly, so dont drive it, but its ok to idle for testing,, if the truck doesnt stall out with the 'SET TIMING" Connector unplugged, then its something besides your distributor, cap, module, coil, coil wire , and rotor. look for the plug by the passenger airbox first. thats where it is on my 94. on my 88 it was by the firewall.

Click to expand...