I have a 93 civic d16z6..... while driving my car runs Great, smooth (car warmed to temp), air/fuel at 14.5..... but when i approach a stop light, and push in the clutch to coast to a stop RPMs drop to idle but then begin to jump between 750 and 1500rpms while still rolling. air/fuel drops as well to 17.5 to 20. back to 17.5 then back to 20. ect... but as soon as the car comes to a stop the idle starts to smooth out at 850rpms and air/fuel goes back to 14.5 Also if i let the car idle for like 5 to 10min. after its warmed up the air/fuel will just drop off and jump between 17.5 to 20. then shortly after check engine light comes on? is this a bad sensor??? if so what sensor? any help please... thanks guys.....

 

bump>>>

 

bump< anyone???

 

last bump....

 

sounds like a bad IACV.

This would probobly be better off posted in the tech section or the civic section.

 

I would pull off the IACV and clean it with some brake cleaner. Is the car tuned?

 

k i pulled it off looked pretty clean still, the only thing i can think of is that i just recently put on 550cc rc injectors and am tuning with a vafc2 . the car ran fine with stock injectors....

 

it amazes me people still use afc hacks when you can chip an ecu and buy a chip burner for less then half the price.

your problem is your 1999 tuning hardware.

 

I agree these kids never learn =/

 

Put your stock injectors back in. Set the afc back to stock or default settings or whatever. The car should run fine after that.... If you're boosted I wouldn't be hitting any boost yet either...

Lookup xenocron or phearable and have them burn you a basemap for your setup so you can drive it to someone to get tuned(if you ecu is chipped, if not find a p28 and have it chipped or buy on from a vendor). the afc hack is ghetto and not worth anyones time anymore when decent engine management is available