So I am installing my new injectors and when I pulled off my tb and intake manifold I found this thing under the secondary fuel rail that has a hose coming off of it. The hose goes toward the firewall and then it is just blocked off with a bolt haha. Ive searched my Haynes manual and fsm but I can't find anywhere saying what it is or if i even need it. Any help would be appreciated!




sorry for the crappy circle, I did it in paint. Oh yeah, this is an 87 TII

 

I'm guessing coolant runs through it...

 

I was thinking that too because of the size of the hose.. I just really wanna know where it is supposed to go to. Or even just what it is haha.

 

remove bolt, fire up car, water? cha ching

Fuel, oh shi- clean up fuel

???? - look at the fsm pdf's and see if you can find it in the manifold diagrams.

 

It is the sub zero start assist system. Mazda recommended its removal in a TSB. Get a block off plate and take it out.

 

Awesome. Thanks!



Itsss outtaaa theree.

 

Rewire it and find where it gets the coolant from (Or get a tank) add premix, make smoke screens (Make switch to toggle the sub zero crap)

win!

 

hey mate, sorry but can you break that down a litttttle bit more for me?

i have no cold start, bought car like this and i want to make it start good on cold start and for that matter, hot start too

 

^No idea man, what i said i read from a fb owner and it'd be funny to blow a cloud of oil smoke at a tailgater, it wouldnt affect starting.

The sub zero assist stuff injected a mixture of coolant i guess into the manifold to de-ice or something, useless...

 

The Sub-zero system came with a small tank on the passenger side (left hand drive) of the firewall, near the black round charcoal canister that collects gas fumes. I haven't actually read the TSB (anyone?) but the system was supposed to help build compression when really cold. You filled the tank with 90% coolant, 10% water. On cars with the system (in warmer climates, the cars didn't come with the sub-zero system), there are two sensors in the oil pan. One is the oil level switch, the other is an oil temp switch. Basically, when cold, the sensor would ground, and when starting, the pump in the sub-zero tank would turn on and send the coolant mixture to the "injector", which is the part you have bolted to the extension housing.

edit to add: I guess Mazda didn't see it worth it, or it added more problems than it solved, so basically the TSB said remove it (really, you just need to unplug the pump connector at the sub-zero tank).

 

You do NOT need to take any exhaust parts off. You'll need a wrench for the top two bolts. Feel with your hand between the bottom of the Intake manifold and the top of the exhaust manifold. You'll feel two bolt heads. They'll promptly snap off as you turn them. There are two more below the manifold. The last two are on the side holding the two manifold heat shields together, which you may not have to remove to take the heat shields out if you bend them a little.

If you're doing this to take the manifold out (and get to the nuts that hold it in), you can worry about the heat shield bolts that broke off when you have the manifold out.

 

thanks for all the additional info. All makes sense noww.

 

ethelyene glycol coolant

 

totally off topic but where can i get the manuals in a pdf format

 

^ it should be in the FAQ

 

ill check there thank you

 

theres nothing there can somebody point me in the right derection

 

You didn't look good enough then. The manuals for all series 2nd gens are in the FAQ.

 

can you point me in the right derection then ?

 

Come on you have to open your eyes and read the words on the screen.