93 ranger spark sometimes-sometimes not

[indyjim]

1993 ranger 2 wd 4.0v6 it well start up and run fine for about 15.20-min then just shut off, then it has no spark,turns over real fast but wont fire. wait a little while starts up. has new icm-new computer,thanks for your help.

 

[Ranger Al]

can you pull out a trouble code??

 

[indyjim]

no codes

It was checked and no codes came up. The fuel pressure, the fuel pressure regulator, the MAF have been checked. I put a new coil pack on. All the grounds have been checked. I checked for vaccuum leaks. The truck will run for 10 or 15 minutes and then it just quits as if the key were turned off. After it shuts down there is no spark. Sometimes it will start right back up and sometimes it won't start for 10 or 15 minutes. I also had the control module checked it and they said it was good.

Thanks for your help
Jim

 

[Ranger Al]

Try checking the "inertra" (think thats the spelling) switch located on the passenger side floor board. It might have pop up.

When it stop, will the engine crank over at all? I am figuring it is electrical since all the fuel are all check out.

 

[BrooklynBay]

Did you check/replace the crankshaft position sensor? It's possible that when it gets hot, it doesn't provide any input to the module to tell it that the engine is turning. If you would provide a simulated stream of pulses to your module when there is no spark, and then you see that it starts up again, then you will know for sure if that is the defective part.