5.0 backfires - problem solved!

[broncosbybart]

Having a way to measure fuel pressure has been a key source of info for me, on working with my rig. You can have a permanent pressure gauge if you want it, it would be nice but is totally up to you. I don't have one set up permanent.

[johnpaulgolf]

Did a little reasearch and it refreshed my memory cratchhe:

Ok this http://www.holley.com/512-500-1.asp

And then this http://www.steeda.com/store/steeda-fuel-...stang.html

:popc1:

[chuzie]

What ever happened with the KOER codes?

[SC74]

It hasn't thrown a check light since I figured out my stale fuel / lack of fuel problem several weeks ago before I swapped out the rear 4 link. It's got plenty of fresh fuel now and no light

[chuzie]

Whatever is happening may not be enough to trigger a hard code in the computer which is when you see the check engine light. The only way to determine if something is going on with your electronics in a situation like this is to explore the KOER and CONTINUOUS tests when the problem occurs. Otherwise, you may be chasing a ghost.

[SC74]

Looking at adding one of these in-line on my supply line. I think I can add it right where I already have the fittings going from hose end to the Ford EFI fitting. It would be nice to find a shrader valve with a 1/8 npt thread so I wouldn't have to mount a permanent gauge here - lack of space mainly.

Here is a shrader valve with a 1/8 npt male thread fitting - just hate to spend more than the part on shipping and don't know where local would have anything like this unless the local TSC?

[SC74]

After looking under the hood while closed, there is not enough room to add that fitting in-line where I had hoped. Of course the easy place won't work and I may end up cutting the line further down to add this if I have to.

I did find the STI wire - it is in the same plastic block with the other wires that is impossible to open up!

[SC74]

Just grounded the STI and checked for codes via my check engine light. Here is what I got....

2-2-8-1-8-2-8-5-8-4-2-2-8-1-8-2-8-5-8-4

If I read correctly, this gives me codes:

22: MAP/BP sensor out of self test range

81: Air management 2 circuit failure (AM2/TAD) - this is for KOEO, but under CM it says MAP sensor vacuum was not greater than 2 in-Hg (7 kPa) during normal vehicle operation. The instructions on Ryans harness says Smog Pump Solenoid 2 inoperative - Soft Code

82: The only 82 code is for KOER and says Air management 1 circuit failure (AM1/TAB) The instructions on Ryans harness says Smog Pump Solenoid 1 inoperative - Soft Code

85: Canister Purge Solenoid circuit failure

84: EGR Vacuum Solenoid circuit failure

Can anyone else make sense of this foreign language to me? I am going to go do it again and get past these codes and see if it has any CM codes.

[SC74]

And the one CM code is 96: Fuel pump secondary circuit failure. The EEC did not sense battery voltage on the Fuel Pump Monitor circuit.

This makes no sense to me b/c my pumps have always cycled on with the key switch.

[broncomatt]

Just on what I have read I would be looking for a ground or power problem. All of those codes are realted to low or incorrect voltage.
I have a bunch of wiring diagrams if you need any, what year is the 5.o from?