DPFI to MPFI..... Stumped!??
 

Any one ever done a DPFI to MPFI conversion and the ecu throws a cel 9 cyln. pos. sensor? I've traced all the wires from the dist. back to the ecu. Found the first dist. had a bad pickup. Replaced it, still the same code. Replaced the computer, Still the same code. Tried the new dist. in my Si, no code. Tried swaping the computer to my Si, no code. Checked resistance through the pickup, ok. Checked resistance at ecu plug, ok. Damn......I'm stumped. Hopefully someone has the answer for me.

Re: DPFI to MPFI..... Stumped!??
 

theres a blue/yellow and a blue/green wire coming fromt he distributor on the si and it isnt there on the dpfi model.

c2 goes to one and c1 goes to the other. c1=blue/green and c2=blue/yellow

Re: DPFI to MPFI..... Stumped!??
 

Yeah......that's the one I've been testing. The cylinder position sensor.

Re: DPFI to MPFI..... Stumped!??
 

You've got a wire mixed up somewhere, make sure you know whether the diagram you're looking at is looking at/away from the plugs.

Re: DPFI to MPFI..... Stumped!??
 

when i did my mpfi swap i started at 2pm, fell asleep in the car at about 6am.
got it right the next day

Re: DPFI to MPFI..... Stumped!??
 

Yeah, I fucked mine up a bunch with looking at the wrong connector on the ECU, and then the wrong orientation for the plug/diagram. Then I tried to start the car, and realized that I fucked up the C10 and C12 wire swap, and had the two switched around. Fixed that, and wham! Car fired right up.

Re: DPFI to MPFI..... Stumped!??
 

I want a get a plate that says JUSTADX

Re: DPFI to MPFI..... Stumped!??
 

i did my mpfi swap and got everything working but fuel pump dont prime and start dont crank, i have spark no codes. im syumped too

Re: DPFI to MPFI..... Stumped!??
 

You got everyting working...except the car?

Can you hear the fuel pump turn on when you turn the key?

Is there fuel in the rail?

Do you have blown fuses?

Just be logical about solving the problem, and eliminate the unknowns.

Re: DPFI to MPFI..... Stumped!??
 

everyhting works properly except fuelk pump and starter, and no it doesnt turn on, i replaced main relay checked all fuses i can jump the starter from the batt abd spray sarter fluid in and nothing happens just cranks. it almost started a few times but never did cough sputter that stuff