Double throttle and solenoid questions
 

A few questions here, I did a full vacuum hose job and my charge relief solenoid nipple broke. I was doing some reading and the double throttle solenoid can be used in place of my charge relief.

So I figured since it looks like double throttle is useless, I'm going to use that solenoid for charge relief. I don't want to go all the way with it and remove the butterflies so I just cap the vacuum nipple on the UIM? Since its not seeing vacuum it stays open? Double Throttle is only there to prevent hard driving when car is cold.

Since that solenoid is missing what Ohm resistor would I need to trick the ECU? I also need to trick for EGR. I am on a stock ECU btw.

All the rats nest solenoids are interchangeable with one another, so yes you can use whichever you'd like.

Since you're already in there, I suggest testing each solenoid and using the best performing ones for the important turbo operation.

Instead of putting in a resistor, just put the bad solenoid on the double throttle, it's not going to be working anyway.

zeroG is dead on.

I would also cap the unused vacuum lines off to avoid vacuum leaks.

Yes the rats nest solenoids may have different part numbers but basically they are all 3-way solenoids with different fittings on them.

Yeah I figured putting broken solenoid on double throttle. But since this was a jdm motor there's no egr. I have a federal 93 ecu and I believe they have egr but no sensor on the valve itself. So I need to resist that plug too. I have no extra solenoids.

Time to pick up a rat's nest worth of solenoids in the used parts section ... you're going to need another one sooner or later ...

Maybe someone can chime in about the resistor. If not, I'll take a meter to a spare solenoid when I get home tonight ... or look in the FSM.

After this it's a matter of playing around with Ohm's law to find the necessary wattage of the resistor.

500 ohms would work nicely with a 1/2 watt resistor ... but I would want to be sure that the coils were at least 500 ohm or you're risking burning the ECU's output out for that solenoid.

Yeah you lost me in all that electrical talk lol. I have read in a fc thread that someone mentioned the fd uses 1/2 watt 330 ohm resistors. Just wanted to confirm on the 3rd gen area first.

OK ... I just checked two of them. They were both about 40 Ohms.

Thats a 5 watt resistor ... bit large and I don't think that the ECU will need to see that much load.

Since you've read about 330 Ohms working I say try it.

Pick up this:
680 ohm 1/2W 5% Carbon Film Resistor pk/5 : Resistors | RadioShack.com

Wire two in parallel and you'l have 340 Ohms and 1 watt. That'll cover the fact that 330 Ohms will draw a bit more than 1/2 watt.

Let us know if it works!

I really hope I don't burn out the ecu out like you said. I'll try them out.

You won't burn it out as they'll put less load on it than normal ... you might still flag an error code though. We're erroring way on the safe side.

Read this thread.



https://www.rx7club.com/3rd-generati...it-ecu-952285/

Okay so it is 1/2 watt 330 ohm. But according to that thread it still causes a code on emissions solenoids?