I'm in the process of trouble shooting and I'm wondering what do fluff does the variable resistor do????



It's a little knob near the air box and has an L and an R on it...

what the fluff does it do and how do I test it.

Thats the idle mixture screw, L = lean R = rich. Don't mess with it, thats why its filled in w/ black crap from the factory. If u screw with it you can get horrible gas mileage and u would need another one to set it back to be sure. I don't know how to test it.

HOLY SHIIIIIIIIIIIIIIIIIAAAAAATTT!!!!!!

my car has been on the fritz and my air fuel meter has been reading lean ever since I got it back from the body shop....and I never noticed the variable resisitor till I got it back...and the only reason it stood out is because it didn't have any kind of cap on it.

well I gotta go see it that was the trouble (after work)and if it is the problem............I will head over to the body shop with my goons, bats, and a chainsaw...



thanx

Well I've adjusted it once because when bought my car I went to a Mazda dealer shop to get the idle speed adjusted. When I got back home, I ended up with the 1988RedT2's problem in his post on April 4 ("Idle problem"). I was watching when the mechanic worked on it, and he messed up with this variable resistor.

I used two 12-volt lamps that you connect in a test connector under the hood (I don't remember which one) and it gives you indication of which direction to turn the crew if ever. I don't remember exactly, it's 12 years ago. But I could track down the info if you really need to test it. https://www.nopistons.com/forums/pub...>/rolleyes.gif

I must admit I was wrong. This test with lamps is for throttle sensor adjustment and I remember how to do it. But I can't remember the way you can check and adjust the variable resistor, but I did once.

I must admit I was wrong. This test with lamps is for throttle sensor adjustment and I remember how to do it. But I can't remember the way you can check and adjust the variable resistor, but I did once.[/quote]

You can check out the factory manuals at both http://www.fc3s.org and http://www.iluvmyrx7.com .

Thanks alot 13BAce, this is great. :sigh:

Now I remember, that was in the factory manual that I saw the way to adjust variable resistor, a long time ago. I borrowed it from my Mazda dealer then.

Being able to access them online is a great thing. It helps out since my friends have 2 of my 3 manuals. https://www.nopistons.com/forums/pub...IR#>/angry.png

Yeah, I've been looking for them on the web for a while, but they're not easy to find or I was looking in the wrong direction.

86-88



http://www.fc3s.org/88fsm.html



89+

http://www.fc3s.org/89fsm.html

Yeah...they're on the same site so not hard when you are in the home page. The ECU Check is also interesting.

im gonna bring this topic up front now....



lets say that one of my friend tampered with it and that his car cannot idle for its own now....new engine.....I suggested him that it would be better for an engine to run too lean than too rich right? less gas cant be more harmfull than too much gas........

Running lean can be harmful because the fuel has the ability to cool down the combustion chamber, preventing self-ignition (pinking) and longer spark plug life (and engine life).



But that's less important when running idle or at low power so running lean means less emissions and fuel economy (some engines don't idle smoothly when too lean). https://www.nopistons.com/forums/pub...>/rolleyes.gif