I am ready to replace all 1992 spec solenoids with 99 spec solenoids this one in black box.
The black box have two differend solenoid code 4 have the code FEGC-18-741 and the other 3 have code B6AT-18-741.The body of solenoid is the same.
What is the difference between this two type of solenoids?

 

ok probaply nobody knows.
At least can someone told me the colors who have the 1992 solenoids?
I mean the color of the little sticker who have on the body.
Thanks.

 

The solenoids on the 1992 rack are basically all the same. The only difference is the colored stickers and some of them have the plastic filter basket on one nipple.

Dave

 

I know but the same colors have and the 99 spec who have differend code so I can found the correct solenoid from the color of sticker.

 

The colors correspond to the colors on the harness:

https://www.rx7club.com/showthread.php?p=6140197

 

Do the colors actually correspond?

I gave up trying to interpret when I saw 2 solenoids on the same rack: one with 2 small orange dots and another with one 1 large orange dot.

Perhaps it's just because the solenoids on my car had been shuffled around, but I recall trying to correlate the sticker to the connector and seeing no relation whatsoever.

Dave

 

Bumping this up, just wondering if anyone knows the answer to this?

 

As far as the 2 part numbers at the start of this thread, I looked around and the valves LOOK identical. It looks like either would bolt right up.

The only question is if the internals are different. I imagine they would work the same as far as which ports are normally open and which are normally closed. There could be a difference in internal materials or spring pressure.

FEGC is going to be an FD-specific part, and they may have just used the same part but gave it an FD-specific part number or there's something different internally.

Looking around they are both about the same price new (around $80) so that's a wash. The FEGC may be harder to source.

Dale

 

Yes I just tested the 2 different solenoids yesterday actually. They both have the same ports open and closed, and with and without 12v. So they seem to function identically.
Why would mazda bother using 2 different parts though when they could just use one?

There are many aftermarket solenoids available for the B6AT solenoids, which can be had for under $10.

 

The B6AT's application is a vacuum-only application which is fairly easy to seal up. It may or may not hold boost pressure well. But, for the low price, it might be worth giving the aftermarket one a try.

Dale

 

Ah really. What do you mean by they are fairly easy to seal up?

 

in the USA the B6AT-18-741 fits the 1996-1998 MPV

the FEGC comes up, but wasn't used in the USA

we got KL01-18-741 and FS05-18-741 as well, most dealerships would stock these, they go bad a lot

 

A vacuum is typically fairly easy for the solenoid to seal. As long as the rubber inside the solenoid is good, the vacuum will suck the piston inside shut. For boost it has to have a spring strong enough to withstand the boost pressing against it and that can be trickier. That's why some of the stock 93-95 solenoids have problems.

Dale