Ford vs Chevy Build-up

[Harry 6674]

Originally Posted by HandOverFist

Got the skinny on my problems with the engine from Brian. I need to run a manifold vacuum line to the regulator...currently at 40psi, the computer thinks the engine is at WOT at all times therefore the rich idle. I also need to re-install the deleted IAC valve on the throttle body so it can get more air than what is allowed thru the butterfly alone. Timing.procedure was already in place and not part of the problem. I did find a loose connection on the starter relay which may explain the lack of charging...will see on the next fire-up.

Oh no you didn't mention the IAC valve in public?

[HandOverFist]

Originally Posted by Harry 6674

Oh no you didn't mention the IAC valve in public?

Sorry Harry...not sure I understand the question.

[Harry 6674]

Originally Posted by HandOverFist

Sorry Harry...not sure I understand the question.

It's sort of like getting creative with leaky carb gaskets back in the day to increase air flow. The Idle Air Control is a 1/2" controllable air leak.

[HandOverFist]

Yes, Brian told me by taking it off the engine I introduced more problems into the mix...don't need any more of those lol. I'm headed to the shop right now to test the changes.

[HandOverFist]

Ok guys...I'm open to any and all suggestions. I made the changes suggested in relation to a vacuum line connected to the regulator and re-installed the IAC motor, but have made no progress. The vacuum line did not lower the pressure at all at idle rpm, but it will start and idle for a minute then seemingly load up with fuel until it dies. I even tried lowering the fuel pressure to 30psi with no improvement in idle quality.

Adjustments in the PMS controller do not seem to have any effect as far as pulling fuel away at idle. TPS voltage is correct and shows it at idle position in the controller screen. 73mm MAF w/24 pound calibration tube, factory throttle body, EGR deleted and 24 pound injectors. All fuel lines are -6 AN. The injectors were purchased used and I assume they are 24 pound units...I have no clue if all are working as intended or if any are faulty.

Using this regulator... http://aeromotiveinc.com/products-pa...***-regulator/

A diagram of how I plumbed the system...



Hoping someone might pick out something I have done wrong or anything amiss.

[Painter]

Well Rich here goes- I don't know about this controller you have or ford efi for that matter BUT. Onthe lT 1 s that I have built and worked on we plumbed the line from the pump to one end of the fuel rail and ran a line from the other end to the regulator then the return from the regulator to the fuel cell. I am thinking this your problem. EFI is different that carburation. I bet if look on those fancy fuel rails they have an fittings on both ends. Us one for inlet and the other to the regulator.

[HandOverFist]

Originally Posted by Painter

Well Rich here goes- I don't know about this controller you have or ford efi for that matter BUT. Onthe lT 1 s that I have built and worked on we plumbed the line from the pump to one end of the fuel rail and ran a line from the other end to the regulator then the return from the regulator to the fuel cell. I am thinking this your problem. EFI is different that carburation. I bet if look on those fancy fuel rails they have an fittings on both ends. Us one for inlet and the other to the regulator.

Not sure I understand. How does the regulator lower the pressure to the injectors if the rails see the pump pressure before it connects to the regulator?

Is this what you are describing? Is adjusting the pressure at the regulator returning fuel to the cell at a rate to match what is shown on the gauge?

[black88coupe]

What color are the injectors?
19lb. injectors have tan tops.
24lb. injectors have blue tops.
42lb.injectors have green tops.

[HandOverFist]

Originally Posted by black88coupe

What color are the injectors?
19lb. injectors have tan tops.
24lb. injectors have blue tops.
42lb.injectors have green tops.

I'm pretty sure they are blue Mitch. Is the way I have the system currently plumbed completely wrong? Would it cause a rich running condition which I could not compensate for? I had read somewhere the way it is currently set up it might lead to a lean condition on #5 and #6 cylinders under certain circumstances, but that was with very high hp applications.

[black88coupe]

I haven't ever run my fuel system that way so i have no experience with a setup like that. The factory fuel system with a little larger pump is capable of supporting a pretty good amount of HP on it's own. My setup was about 325hp so the factory style setup works fine for me. Sorry I can't help you more.