HELP Running lean with 50lbs injectors

[04 Mach1]

Have a Autometer A/F ratio gauge

[QWKSNKE]

Originally Posted by 04 Mach1

Have a Autometer A/F ratio gauge

you can't really go by that. You really need a wide band 02 to be sure on your assumptions

[boss96]

Originally Posted by 04 Mach1

I thought i could run it off of the o2 since the stock computer is 19lbs injector and the o2 will only pull out about 20% of fuel out i thought it should still run rich but i guess i was wrong still lean. Then i put a stock maf on and stuck a 1/4 socket in the opening restricting the amount of air the maf would read and got it running somewhat ok.

That does'nt sound right, restricting the hole in the maf should lean out the fuel. Headers that are glowing read indicate way too much fuel.
Bob

[Dale McPeters]

Originally Posted by boss96

Headers that are glowing read indicate way too much fuel.
Bob

Bob,

I had this happen on the stock engine that I just put back in
the little blue '91lx, that I had pulled the 347 out of. Cam timing
events will cause the headers to glow red as it will introduce fuel
at the incorrect time.

A bit of the story is that I had someone build me a stock 5.0 engine
as I did not have the time, working to much. They had accidently installed the incorrect camshaft & timing set. It ended up being a speed density cam.
They did not install the F-cam that I had taken to them. Anyway I chased the glowing headers about a day and a half until I pulled the valve covers and checked the timing events of the camshaft myself. Well low and behold it had the wrong cam....

I then installed the correct cam & timing set. No more glowing headers.
Needless to say I got some of my money back from the Ford guru engine builder........

In other words always check everything......

[QWKSNKE]

Marc,

What kind of cam are you running?

[04 Mach1]

It is a lunati 535/545 lift 224/232 duration at 50

[04 Mach1]

I got the maf back today and reinstalled it. I know I can't go off of my A/f gauge due to it not being accurate but it seems to be back to its old self rich lean rich lean. Before it would be rich for about 20 seconds and then berry the gauge lean and stay lean. Thought it was fixed until I started playing with it in the drive. I hit the transbrake and let it lose then hit it with the brake and 2 step seemed to all be there but pulled back in the garage and the headers are now red. Can the 2 step cause this?

[QWKSNKE]

Is the cam a new install? Or have you been running it for awhile. Sounds like timing is off

[Italian LX]

Also, did you degree the cam or is it installed at TDC?

[04 Mach1]

Timing cain set has 3 position straight up 4adv and 4 retard. set at 4adv