First off, this is my first post. Howdy.
I'm working with a 1988 (I believe) 302, that was donated from a mustang. Having no luck getting this thing to run... anyways, here goes:
With the coil-to-cap wire snug on the distributor terminal, I get an occasional fire, but no start. When I pull the lead off, and allow it to arc from the end of the lead to the cap terminal, it fires right up, but runs poorly, and rich. The firing order is correct, unless it's a later engine, and I've now replaced the distributor, ignition module, coil, and gone through another cap and rotor as a check.
While its running, the timing seems to be about 10-15 degrees advanced (rust on the crank pulley keeps me from getting an accurate number). Light throttle application and it accelerates, seemingly smoothing out. Heavy throttle causes an intake backfire, and the engine falls on its face. Advancing the timing worsens this problem, ritarding the timing makes the engine run rougher, and takes all of its throttle response...it won't accelerate whatsoever after ritarding the timing.
Advancing timing causes an intake backfire, ritarding causes a backfire, like it's 180 out. Rotating the distributor shaft 180 degrees, and I still get the same thing. What has me confused is the coil-to-cap lead. Snug, it won't run. Loose, it will.
I just got another firing order I'm going to try tomorrow; 1-3-7-2-6-5-4-8... this sound right? Currently its 1-5-4-2-6-3-7-8.
I've also heard that the cam can jump timing.... could this be a possibility as well?
I've learned the fuel pressure regulator is bad, and have been told that's half the problem. It doesn't seem like that would cause as big of a problem, but could it?
I'm at a loss here, I'm ready to give up. Any ideas?
Edit: I forgot to mention that it's fuel injected. Not sure how much of a difference it would make, but if it's needed, there it is.