Hi my car (90 rx7) runs really rich so i think...originally my car use to have a strong gas smell and made popping noises in my exhaust from fuel not burning reaching the exhaust and exploading. i fixed that by paching up a hole in where a sensor atches to this cylinder thing attached to the air box. now it has a mild smell and still does the ocasional poping would u know how to fix this?

 

The 'popping' is normal. It's called 'backfire.' Don't worry about it, all of our cars do it. It's not bad for the engine (its normal). I'm not sure about your other question, though.


Andrew

 

What are you talking about? You got a missing sensor and you patched the hole that the sensor was in? Why not replace the sensor?

 

no like i mean i patched up what the sensor connects to i mean sensor like a bunch of wires ataches to this cylinder thing connected to the airbox that says mazda on it

 

Title of thread updated to better reflect question

 

Did a hose come from some metal stuff in the back of your engine and plug into a blast plastic thing? which goes down into a hose that connects to the air box?

translation: does it go from the UIM under the BAC valve to the black nipple that connects to the air box?

 

hi green is the cylinder thing i was talking about
the blue is the sensor thing
and where the red is pointing to the place that i patched up but its under the cylinder thing
thx for the help^^
lol but im still wondering what could be causing me to run rich and have a gas smell problem

 

Ok. The "cylinder thing" is your airflow meter, or AFM. Its vital to the proper operation of these cars, and adjusting or messing with it in any way can cause Bad Things to happen. When you say you "patched up" a hole in it, can you be slighly more specific? Which hole? What made you want to "patch" it in the first place? What method/material did you use to patch it?

Furthermore, running rich is not an easy problem to diagnose. My vehicle ran rich with a popping exhaust (technically "afterburn", not "backfire" on these cars) until it died. I think it died and ran rich and afterburned all for completely unrelated reasons (died from a tossed seal), but I wasn't able to troubleshoot it fully before it died. I spent a LOT of work on it though to try and figure stuff out. But it started both running rich and afterburning after I did an exhaust + intake mod, as you seem to have done. Perhaps that's just a normal consequence of upgrading those components on these beasts.

 

is backfire in Rotaries that common? My 89 TII has that too, but i thought i needed tune-up and timing was off or something...

 

what afm is that? It's gotta be aftermarket or something.....

 

... it has a downpipe ... and well in the beggining there was a crack in it like about maybe a quater wide so i patched it with duck tape.
before that though my car wouldn't even hold an idle properly i would have to keep reving it so that it wouldnt die on me.

 

i think its a 89 to 91 afm

 

It's S5....

You have a S4 don't u?

 

im not quite sure what you mean by s5 s4

 

7 "if i were you then you'd be me and i'd use your body to get to the top" seriosly though need tot make a cold air box for your filter....you are problably loseing HP by having it sitting there like that....

 

Reeheeheely........can i use a s5 afm on my s4 without rewiring it? Or is the ECU program totally different?

 

He said he has a 1990 so he has s5.

s4=series 4=86-88
s5=series 5=89--91

 

haha you guys k now alot about this stuff

 

do you guys think i should take it to a dealer?

 

You can, but only if you like downgrading the parts on your car...

 

should i change my plugs?

 

yeah i read into it NZ and the s4 styke is better...thnx....

 

check your timing, when I installed my filter the timing was of.

if you have a non turbo, a little screw should be on the top of your engine...try playing with it a little by little. turning to the left or right.

and then see if it will run rich...

 

I also put the tornado in my FC.

man it was running rich then. Now that I fix it my RPMs don't go over 1000 when the car is warm.

 

thx thx =)