mixedupcat
Registered User
I'm new here and really know nothing about Ford products. I'm here on my buddies behalf as he has a '87 XR7 that was a 5.0 auto. The motor on that one ran extremely rich and wound up blowing a hole in the #3 piston. So, he put in a HO 5.0 from a '91 'Stang, but still runs rich, intermittently doesn't want to idle, no power down low, etc. It does have new O2 that are in the range, TPS is also new and adjustable, well within specs. MAF is working properly, and all other sensors are replaced. We know the 5.0 and the HO have different firing orders, and the fuel rail has been adjusted. The computer has tried to go to the shortest setting for pulse length, and still runs rich. Do we have a computer problem ( bad main ground) or should we go back to the 14 lb injectors, what? I'm afraid if we go to the 14 lb, we may run lean for that cam and head flow. Can some one help with an answer and maybe some specifics about pins if the computer does need changed?