Ford vs Chevy Build-up

[SSGT Mustang]

Do the one-wire mod to the alternator. It's cheap to do, more reliable and safer. You will be able to diagnose any alternator problem very quickly.

[HandOverFist]

I'll have to buy a IAT sensor as I can't seem to locate the original. If the factory O2 sensors can in fact be deleted I'm all for that. If a one wire alternator will cure the no charge problem I'll gladly order one to get away from that aggravation quickly.

[SSGT Mustang]

Don't delete the O2's. You'd be in open loop (no feedback to the computer). You don't need that right now. You probably don't need that ever, but it's option later on when you become more familiar with tuning efi.

It's running smoother now because you have closed loop when you installed both O2's.

[Tony Corley]

I didn't realized you had left the IAT off also, lol. Remember, unlike a carb, an efi system is only as good as the info it receives. Make certain all of the sensors are not only hooked up, but in good operating order. If you need to replace any sensors, buy Motorcraft.
As far as eliminating the o2's, yes it can be done, but at this stage of your learning curve it will be much easier to tune with them in, and they will not hurt you in any way as far as making power with them being there.
They will make the whole tuning process much more forgiving.

[HandOverFist]

Bought a new IAT sensor and put it in. Also bought a new MAP sensor, but I don't see any evidence anything has changed. Car still starts and idles tho, Scheduled Wednesday morning to get the front-end lined up. I have some new screenshots of the controller while running that I will post when I get home this evening.

[fordteacherguy]

Rich,

Also make sure your injector ground is connected to the engine and your engine has a good ground strap to the firewall. EFI needs good grounds! The main computer ground should be clean and tight as well and should be on the driver side front inner fender below starter relay.

The ground for the injector harness usually goes on a upper bell housing bolt.

[HandOverFist]

Yes, I have all those grounds tight plus some Brian. Question for you efi users...what do you all use to determine if specific sensors are working properly at any given time? I have this controller screen to view some of them, but was wondering how others know what exactly individual sensors are reading in real time.

Some screenshots from initial firing this afternoon -















Putting the car on blocks in the morning to set pinion angle and lock everything down.