1990 3.9L

Cant figure it out i start the truck it runs for around 15 minutes the just dies out. It almost sounds like its getting choaked out but i have no idea. And if i try to start it after it dies i can't start it for around thirty minutes And then when it does start it runs only for a few minutes. i was thinking it was the autoshutdown relay but not to sure. plus i cant find that realy at an auto part store to purchase one anyhow. any suggestions i could use them

 

Does it sputter or misfire before it dies or does it just shut off? Because if it just cuts off with no sputtering or anything, mine was doing that and it turned out it was the ECM (the brain).

 

well alsso recently i replaced the fuel pump, fuel filter, starter, cable to starter from battery, tps sensor and map sensor as well as all the ingition componets plugs wires cap rotor coili did not replace the screen on the bottom of the fuel filter because it look almost new could this be my prob maybe

 

no it doesnt sputter it just dies out but if was the ecm wouldnt i see a light on my dash or something as a code?

 

My 90 did that. Check the coil and wire to the distributer. Mine was loose.

 

ok just checked it it is snug on both the coil and dist. andy more suggestions?

 

It could be may things. I would suggest get out the voltmeter. Start checking for correct power at the ASD relay, Fuel pump relay, then the computer, and fuel pump ect.

 

ok i can do that where would i find out what the recommend volts or amps for those items?

 

It all will be around 11-12 volts.

 

90 doesn't have the shutdown relay. Only two relays on the inside wall of the left fender. I think the front is the fuel pump relay. As for voltage I can only guess you are looking for 12 volts.