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+--- Thread: 5.0 backfires - problem solved! (/thread-2997.html)
5.0 backfires - problem solved! - broncosbybart - 12-04-2011
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.
5.0 backfires - problem solved! - johnpaulgolf - 12-04-2011
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-rail-pressure-gauge-for-ford-mustang.html
:popc1:
5.0 backfires - problem solved! - chuzie - 12-05-2011
What ever happened with the KOER codes?
5.0 backfires - problem solved! - SC74 - 12-05-2011
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
5.0 backfires - problem solved! - chuzie - 12-05-2011
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.
5.0 backfires - problem solved! - SC74 - 12-05-2011
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?
5.0 backfires - problem solved! - SC74 - 12-05-2011
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!
5.0 backfires - problem solved! - SC74 - 12-05-2011
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.
5.0 backfires - problem solved! - SC74 - 12-05-2011
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.
5.0 backfires - problem solved! - broncomatt - 12-05-2011
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?