When im idling my air fuel gauge normaly sits in the rich/green LED. after having my car sit for a few months it now doesent go into rich but withen 20 seconds of idle it tampers down to lean then goes of the gauge completely. its this ok? i have no idea what this means and figured the forum could help thanks.

Alix
91 Turbo II
New plates read "WAT HNDA"

 

Well this is my experience but not on my RX-7 but on my Subaru Impreza 2.5RS. When I crank the car up it will stay in the green for a while when idleing and it will settle down and then just disapear off. But when I rev the motor it will go back to the green and then when starting to idle again will just taper back off to the lean and disapper again.

 

They'll pretty much stay wherever they feel like at idle, mine's pretty erratic on both cars I've got it on, there's usually very little you can do with it at idle, I wouldn't worry.

 

A car that is stock, and working like it should, will show lean at idle because.......the airpump is injecting fresh air into the exaust ports from the airpump. Normal. That's the way it should be. If it's a stock car and it's not showing lean at idle, then the acv is dumping the airpump air overboard. That car is broken.

The mixture is NOT lean. The o2 sensor is located downstream of the exaust ports. The exaust may be rich prior to the exaust ports, but then at the exaust ports fresh air is mixed in with it. That makes the o2 see a lean mixture. Again, the mixture is not in real life lean. It's probably rich.

On a normal car you can watch your 02 sensor at idle and it will show lean. Now pull the plug off the Relief solenoid. The mixture should now show rich. That's on a normal car that has all the original equipment in place.

That's my opinion.

And that's probably why the 02 sensor is *out of the loop* at idle.

 

I'm asuming this is 100% warm conditions? the air / fuel gauge and 02 sensor is 100% usless untill you drive around for 10 mins. idling from a start for 10 mins probably isn't even enough to warm it up.

as hailers said. full lean with working air pump, and full rich without air pump is normal.

 

oh yeah i have no air pump or any emessions for that matter. it does it after the car warms up and the vac drops a bit when it happens.my current mods are in my sig.