420A Won't Start

[tcavenger99]

ok this post is huge yet i would like to add. My car is now home . last week i went out to get it and it wiuld start (changed the plugs yet this new problem has me stumped my afr is reading 10.25 at idle and she was puffing black smoke about 5 min after startup and the stalling while driving and backfiring. TO MUCH FUEL right well my fuel preasure is 30psi and my injectors are not stuck coolent sensor is good so what would cause this . changed iac moter nothing worked still running way to rich? well i wanted to get the car home so i could tinker with it more frequently . so i sat down and thought humm if its running rich if i unpluged the o2 sensor that would make it run lean hense countering the richness. HAHA it worked the afr now runs at idle at 11.20 and under boost 10psi goes to 10.50 . mananaged to drive her home 2 hours on the highway at 140km the whole way ran ok but under boost backfire and a little black smoke figured that was the sfmu raising the fuel preasure . anyway its home now and i am going to install my megasquirt yet i would like to correct this problem first so any takere . thanks again to all for the input as well

 

[tcavenger99]

gust to add went trough all wires about 10 times and i am just wighting this for reference.turns out that the knock sensor and the crank sensor share the same ground . That is a spliced ground and turns out that the back of my valve cover was leaking and a combination of oil and water made a short .hence loosing crank siginal .

 

[tcavenger99]

thanks All