I am curious how many people have had thier turbo control solenoid fail? (the one with the mitsubishi symbol on it) I was wondering becuase i'm currently on my 3rd one and i think it's failing again.. is there any possible reason why this specific solenoid keeps failing?

 

heat? constant use? debris in the tubing leading to it? etc...

 

What are your mods?

 

If you are talking about the pressure side TC solenoid "E" that is in the rats nest lower rack, then I can tell you that this solenoid is problematic as it has a bad habit of sticking--probably because there is not enough return spring pressure on it's plunger to overcome the boost and release (vent) it. I think this is a design or application problem with this solenoid and is not a solenoid failure, per se. Unfortuanately, the result is that the TCA (actuator) stays open and prevents the sequential system from reverting to primary operation and making normal boost under certain driving conditions.

Tired of dealing with this, I developed a simple work around to this problem. If there is interest, I will write it up and post it .

 

actually i'm talking about the solenoid on the Air control vavle thing, on the side, not in the rack. I am currently running a pfc straight pipe intake, ignition, basic stuff. I have relocated my solenoid behind the ABs so heat isn't as big of an issue nemore

 

Please do, I'm having trouble with this at the moment and I can't get motivated enough to replace it. If I know it won't happen again, that would be great.

 

Funny, I've never had a problem with that solenoid, even after 157,000 miles. That's the one that handles the vacuum side of the TCA. Are you sure you don't have a problem with the other (pressure side) solenoid? They are well known for sticking and/or operating intermittently.

How much boost do you run? The TC solenoid "E" is marginal at stock boost levels and the more boost you run, the more likely you are to have a problem with the TC pressure side solenoid operating erratically.

 

running stock levels

 

Are you sure you have the lines going in correct? I've tested many of these solenoids, and only a few hold vacuum well in both directions. Most of them do quite well at holding vacuum in just one direction - so you might try crossing the hoses that attach to it.

Dave

 

Yeah, I put in a pressure regulator off of the pressure ank, so no matter how much boost I run, the pressure solonoid only ever sees 9-10 psi. Sticking problem solved.

 

If you want to solve for ever the solenoid problem buy 3 solenoids from 96+ fd3s who have solenoid box.The solenoids from black box never stack and is all mitsubishi not hitachi.
The only thing I dont know is what type is correct but both is working B6AT-18-741 or FEGC-18-741.
You have to make an adaptor with wire from your solenoid connector to new solenoid very easy to do.
This mod is discovered first by efso member of this forum.

 

Is Ray at Molloy Mazda the only place to get these solenoids? What is the turnaround time once I order them from him?

Thanks,
Jeremy

 

Any Mazda dealer will sell them, of course.

Ray will probably have them all in stock and to you in a couple of days.

 

whats your boost pattern that leads you to believe its the turbo control solenoid? What was your boost pattern before you replaced it the other times?

 

Sorry to bust this thread up but i think i might be having the same problem. Some times i get boost and some times i dont. Its actually driving me nuts. When she does have boost she flys like a bat out of hell but 90% of the time when she doesnt have boost shes dead. And i know everything is hooked up right because like i said i get boost sometimes. How do you check the turbo control Solenoid?

 

I'm on my second one and would like to know how you worked around it.

 

The workaround is a pressure regulator. If you regulate the pressure chamber to 8psi, the turbo control solenoid will work much more reliably. Without the regulator, the turbo control solenoid has to fight against 12+psi depending on how much boost the turbos are producing.

Dave

 

FSM page F-190 (at least that's the page number in my copy...)



Edit: never mind, see the next post. Thanks for the correction Dave

 

Don't check the turbo control solenoid that way. It's not sufficient.

Do it the way Dave Disney developed:
https://www.rx7club.com/showthread.p...ntrol+solenoid

Dave

 

+1 on the pressure regulator.

 

What kind of pressure regulators are you guys using? Where are you mounting it? Thanks

 

i second that... i got another dead solenoid

 

Mine turned out just to be the vacuum line collapsed and pinched off flow to the solenoid. I had ordered a new one so I replaced it anyway while the UIM was off. it was at about 58K miles.

 

speed of light more info on the fix it solution. I noticed after getting my hands on another 20 solenoids that no of them could handle much over 11psi before locking and not reverting back to a closed state , so i either buy some aftermarket replacements or you should shed some light on the fix solution,,, thankyouuuuuuuuuuu :-)

 

This may be the fix. That was being mentioned.

https://www.rx7club.com/showthread.p...9&page=1&pp=15