90 F150 problems

[montesa]

If anyone is interested I'm pretty sure I've found the problem. The YouTube trouble shooting is frustrating because I've going through coil tests, tfi tests, relays etc. Ended up pulling the SPOUT jumper and the truck immediately started. This means the computer is bad or not functioning and everything else is good.

The SPout controls coil ground through from the computer. Without the jumper in it bypasses the computer and will run but with no timing adjusrments. Frustrating because it's such an easy thing to check and no one recommends it first.

Next thing is check your cowl drainage holes in the fenders. They pack with debris and water leaks into cab. I believe my computer died from water infiltration from clogged cowl drains.

 

[dlbleak]

I wouldn’t think the computer would be very expensive.

 

[swampratt]

This is the first time I have heard of a spout jumper.
Very interesting.
So you are saying the computer with that hooked up would not let the engine start?

Unplug the jumper and it bypasses the computer?

 

[montesa]

This is the first time I have heard of a spout jumper.
Very interesting.
So you are saying the computer with that hooked up would not let the engine start?

Unplug the jumper and it bypasses the computer?

Correct. SPOUT stands for spark out. With the jumper removed it will just use the PIP signal and tfi to ground the coil and get spark. So remove the jumper and it will run but not that great. You're supposed to remove the spout jumper to set base timing. Then put it back in and make sure the computer is adjusting timing.

I was all set to swap the distributor. Glad I didn't. Now I can trouble shoot any ford eec 4 system pretty well.

 

[montesa]

I wouldn’t think the computer would be very expensive.

I hope not. I have to pull it out today and get the numbers to see if O'Reilly's can get one.

 

[CHenry]

I hope not. I have to pull it out today and get the numbers to see if O'Reilly's can get one.

Look on Rockauto.com

 

[montesa]

This is what the jumper looks like.

 

[montesa]

I probably flooded the crap out of it with all the cranking tests. Hopefully that didn't do any damage.

 

[swampratt]

No it probably just soaked the carbon deposits so they come loose easier.

Or maybe it did not even add fuel if it could not get a signal

 

[montesa]

No it probably just soaked the carbon deposits so they come loose easier.

Or maybe it did not even add fuel if it could not get a signal

Yes, I'm hoping that is the case.