ok this really sucks. i replaced every electrical component today. no change in anything still runs like crap. the motor still misses at idle not matter what cold or hot. runs good cold and when it get warmer it runs like timing is off. i shut it off and did some stuff to it and started it back up. the temp was still about 180 ran just fine. then it just lost it's power. so i advanced the timing to 15 degress instead of 10. runs a lot better. mostly all the power seems to be there, but it's hard to start when it's warm and the manifold is a little red on the right side. i don't know, i am just so fed up with this.

 

When you time it with the spout out did you put the SPOUT back in and recheck the timing with a light to make sure it the timing moved?

 

yeah, with the spout in with the light on it, timing is at 30, reving it up it stay at 30.

i changed to another set of injectors today. not to bad, runs a little better, i actually drove around for about 45 mins with it, still kinda missing something thought. but i have to say it's better. still has a hard time starting after it sits for a few mins. so if i don't figure it out soon, i am going to put a carb on it do away with all the electrical crap.

 

i forgot to mention i ran my code reader on it last night. with the key on the only thing i get is everything for the overdrive trans since i have an automatic computer in it. the code reader won't read my codes when it's running, it starts to and the motor dies and the code reader light just stays on. i know i should have a 5 speed computer in it since it's a five speed, but the one have works.

 

I am very surprised that it runs that good with that computer.
It would be missing its VSS input from the PSOM in the 87 truck.
I take it the computer is out of a 1992 or newer truck.
This should turn off half of the injectors and not start at all. At the very least it should be running in limp mode.

I think you need to get a computer out of a 1989 or 1990 5 speed truck for a 460.

 

the computer is out of a 90. I have tried a five speed computer before. it didn't change anything. so i gave it back.

would it be possible to have the timing gear off a tooth. i wouldn't think it would run period if it was. or at least not as good when it's cold.

 

The other computer did not change the timing when you revved it up?
I am not familiar with trying to run an engine one tooth off. But have hear of them jumping timing and not running at all, maybe more than one tooth off though.

 

nope it's was the same. the ecu that was in before i changed it is out of an 89 auto 460 and this one i have in it now is out of a 90 overdrive 460, well it's out of the same truck i took the heads off. timing never changed at all.

 

sorry if all this is bugging the crap out of everyone. Everyone around me don't know whats wrong with it and don't care anymore, they don't even want to talk about it. i just want to get my truck running without nickel and dimming me to death like it already has.

 

The 1990 F-series trucks had a speed input from the VSS sensor on the transmission that also drove the speedometer cable. I do not think the 87 has any such device. Computer may have been programed to change timing with speed. Just a thought.
Also do you have a 195 t-stat in it so the computer reads the right tables?
I think you have checked the ECT & ACT sensors if I remember right.

 

yeah i have 195 stat, your right, i did change both sensors. i was actually thinking one might be bad.

 

i have been doing so much reading all over the internet. thinking maybe tonite i look at all vac lines really close. since i have the upper intake gaskets and throttle body gasket, might change those, maybe one's blown and don't know it even though i have used starting fluid all around it. my 02 sensor could be causing issues, it don't show up on the code reader. not to sure the 02 sensor is the right one, but i was told as long as it was a 3 wire they are the same. it plugs in and it's 3 wire. It was a new 02 but i got it from a friend that works for a coal company and they had a bunch of crap they were going to throw away and notice a lot of new ford parts they were getting ride of and let me have them. guess i just have to keep looking at stuff.

 

oh and i also did another fuel pressure test and i used to be getting a 32 lbs, now i am getting 38.

 

It should idle at about 33-34 PSI and about 42 PSI WOT.
If you pull the vacuum hoses off the FPR with it idling it should go to 45 PSI.

 

i will double check again tonite, the 42lbs wot sounds right. with the vac line of the fpr sounds right.