vehicle is an 88 e250, EFI 302.
Im having a hard hesitation problem. Idle is fine. It just falls on its face upon a load.
No codes from KOEO, or KOER tests.
Ive changed or checked about everything, except the one causing the problem lol. reset timing, changed cap rotor, plugs wires, all vacuums, changed or tested about every sensor. battery is new, exhaust is new from manifold back. alternator is new.
so right now im checking fuel pressure at the rail, key on its 32, and tops out at 40 on hard acceleration. Thats normal right?

 

Fuel pressure is within the ball park, 35-45 psi.

If the coil is original , replace it ! The original coils were known for breaking down under load..

You didn't mention the fuel filter, but good time to do that too.
I realize it an 88, but when they run right they will deliver !
A little side note, next time you decide to replace the plugs if possible, try to use Motorcraft plugs, Fords do run better with Motorcraft plugs !
Spark plug gap is , .042-.046 in.

 

I did use motorcraft plugs, gapped at 45. I have also changed the fuel filter.
Thank you for the info on t he coil pack. I will let you know.

 

well, installed the new pack, made a big difference, but still feel like its fighting for power.

 

Tell us how you checked and reset the timing.
Where was it before you reset it and where did you move it to?

 

I used a light, it was at TDC
I set my guns dial to 0. Removed spout,
I moved it to 10 BTDC. replaced spout.

 

Sounds good.
With everything connected , does timing advance when RPM goes up?

Now we're pickin straws.
The firing order 1-5-4-2-6-3-7-8 right?
If you hook up a vacuum gauge for manifold vacuum, what do you get at idle ?
Next raise RPM to approx. 2000 RPM and hold there,, what does vacuum gauge do? If it starts dropping with RPM held steady, possible exhaust restriction.