i have a turboII s4 engine, s5 turbo, trek 1.7 ecu, racing beat down pipe, no cats... when removing the rats nest. what do i do with the solenoids?! do i need to keep any of them or just unplug them all?! i kept the bac and all the throttle body stuff. just removed the air pump, acv, and egr. let me know thank guys

 

Here's the link to my thread when I did this. I followed the diagram and instructions exactly and my car ran so much better after. I decided to keep the plugs on the harness at the time, but when I rebuild my engine I'll probably just cut them off because I know I won't be putting my emissions back on. I also did the same as you by keeping the BAC and all the throttle body stuff.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/double-rats-nest-removal-twin-scroll-addition-913213/

 

thanks... are you running a stock ecu and harness also?

 

i did all what the diagram shows but the car won't start now... it seems like theres no fuel?! i have all the plugs tucked away but the strange thing is my fuel regulator is on my primary rail and theres no vacuum nipple on the secondary rail just a vacuum nipple on the primary rail

 

Check your grounds. Particularly the one on the driver side by the tmic mounting bracket. Ask me how I know....lol.

 

Nice ill check that out.... Thanks phillyrx. Did that happen to you also?!

 

Smart thinking!

 

all the grounds are good including the one under the intercooler bracket. still won't start!!! theres definitely no fuel being delivered. the fuel pump is good i hear it. theres pulse on the lines but i don't smell any fumes coming out the exhaust... any ideas?!

 

Is this a JDM TII swap? Or did this just start happening..?

 

it just happened... it was running before the rat nest removal

 

I guess the next logical choice would be to check if the injectors are firing. How's the filter btw?

 

I was running the stock ecu and harness when I did all the work, though it's changed a little bit now. I never really had issues starting other than when I forgot to plug in the BAC. It would not start for anything. It would crank and crank, almost catch, then keep cranking. I checked all plugs and found the BAC not plugged in. Snapped it in place and it fired right up.

The only other thing I can think of is your vac line situation hooked up to the FPR. I've only worked on my USDM engine, so I do not know about JDM engines if yours is, but there should be a FPR on the secondary fuel rail and a fuel pulsation dampner on the primary. I'll attach the closest pic I have to my final set-up, it was a mock up so that's why the injectors aren't in. You can see the purple/blue plug at the end of my primary fuel rail which is what the previous owner did to remove the pulsation dampner. And you can see the FPR on the secondary fuel rail with the vac line running to the LIM. I'm not sure if the vac line could prevent your car from running, but it's a thought.

The only things left would be to make sure the injectors are snapped in tight, the fuel filter is good, and you have the proper type of fuel lines. And to make sure all you electrical wires are in good shape.

 

Did you ever figure out what was going on and get it started?

 

Orange: Fuel pressure regulator solenoid

 

hey guys sorry been real busy at work... BUT guess what?! she's alive ahaha finally had the time yesterday on my day off and hey TIIfc3s it was the fuel pressure regulator. i put the fuel reg. that was on the primary rail to the secondary rail, put everything back. fired up first try

 

Nice, it worked for me and I just wanted to make sure that I wasn't passing around faulty information.