bhawk
Well-Known Member
- Joined
- Jul 18, 2008
- Messages
- 115
- Vehicle Year
- 1994
- Transmission
- Manual
94 Ranger 4.0.
We've been battling a no start condition when warm\hot for the last several months and everything we have changed\repaired has failed to correct the problem. The truck will always start and run when it is dead cold. But if we run the engine for say 15 minutes and shut if off, it won't start until it gets cold again.
When it won't start I have hooked up my timing light to a plug wire and I get lots of spark as it turns over.
I now have a fuel pressure gauge and it shows the fuel pump builds 32 pounds pressure right away and it holds pressure after the engine is shut down. When the engine won't start the fuel pressure gauge shows between 30 and 40 pounds pressure, so it can't be a fuel supply problem.
I wanted to eliminate vacuum leaks so we just finished putting in new gaskets on the lower intake, upper intake, fuel supply manifold, valve cover gaskets, flushed and cleaned all 6 injectors, and replaced the fuel pressure regulator. Also since the no start condition started to occur, we swapped out the MAF sensor, throttle position sensor, IAC from engines known to work. Still no start once the engine heats up. I will go to the shop in about 20 minutes when the engine cools and I expect it will fire up and run.
WHERE DO WE GO FROM HERE?? 02 sensors??, coil pack??? computer??? Why does it not start hot but start cold and run decent once it starts. Please HELP, I am near giving up, but I can't let this beat me.
We've been battling a no start condition when warm\hot for the last several months and everything we have changed\repaired has failed to correct the problem. The truck will always start and run when it is dead cold. But if we run the engine for say 15 minutes and shut if off, it won't start until it gets cold again.
When it won't start I have hooked up my timing light to a plug wire and I get lots of spark as it turns over.
I now have a fuel pressure gauge and it shows the fuel pump builds 32 pounds pressure right away and it holds pressure after the engine is shut down. When the engine won't start the fuel pressure gauge shows between 30 and 40 pounds pressure, so it can't be a fuel supply problem.
I wanted to eliminate vacuum leaks so we just finished putting in new gaskets on the lower intake, upper intake, fuel supply manifold, valve cover gaskets, flushed and cleaned all 6 injectors, and replaced the fuel pressure regulator. Also since the no start condition started to occur, we swapped out the MAF sensor, throttle position sensor, IAC from engines known to work. Still no start once the engine heats up. I will go to the shop in about 20 minutes when the engine cools and I expect it will fire up and run.
WHERE DO WE GO FROM HERE?? 02 sensors??, coil pack??? computer??? Why does it not start hot but start cold and run decent once it starts. Please HELP, I am near giving up, but I can't let this beat me.