Please see attached picture of my 1984 GSL-SE (Passenger Side):



See the part the arrow points to? Know what it is? I have everything apart, and have no idea....

Thanks,
-nate

 

Must be -SE specific, not on any 12A car I have seen

 

Dammit, it's the flux capasitor, noob!

 

Dude, I have completely stripped 2 FBs and torn apart almost all of a 3rd. And if you are calling him a noob, then you are dumb. It probably doesnt even do its job anymore whatever it is.






noob

 

Yeah, you should have known that was a B/S post from the Flux Capasitor

Maybe it's something aftermarket?

 

i'm willing to bet it has something to do with idle adjustment. it looks exactly like what's on the fc's. you turn it in/out to adjust the air/fuel mix at idle i think. kinda like our carb'd 12a's

 

It is most deffinatly an idle adjustment.

 

It's the idle enrichment adjuster. Usually the top is filled, so you can't see the screw. There should be a L and R marked on it, for lean and rich adjustment.

 

Bingo.

kenn

 

Damn, you guys ROCK!

There is a R-->L on it (which was covered in dirt) and the top is filled with silicone or some rubbery goo covering the screw. I would not have guessed thats what is, especially based on location.

Thanks guys,
-nate

 

Technically, it's called the 'Variable Rheostat' by Mazda, and as the other posters have pointed out, it's specific to the 13B EFI engines on the SE cars (in the US), and only affects idle mixture.

The proper means of tuning the VR has to do with managing the idle speed to the correct rpm, and then modifying the idle mixture by turning this VR until best idle QUALITY is achieved. An overly rich mixture will drop idle quality and cause a 'lumpy' idle, while an overly lean mixture will cause idle 'hunting' up and down. It is strongly recommended that you NOT use the VR for changing idle speed (which it will certainly do), but instead use the existing throttle air bleed on the TB, along with the master idle speed adjuster on the right side of the TB. These can be tuned along with the BACV to keep the idle at the prescribed setting.

The Variable Rheostat actually provides a resistance reading to the ECU which then makes modifications to the idle mixture ECU map. It is a very fine adjustment and can get you all hosed up if you try to use it for something else, or cut it out of the system. HTH,

 

Damb Longduck! i was going to say everything you did! Hehe.