im not sure why this is happening please help!!1

i have a txs tuner wideband connected on my 03 350z with a turbonetics kit on it for tehe past few days my reading while idling has been around 14.8 to 15.4 and then drastically drops to 10.8 without me moving a thing and then steadily goes back up before dropping again.

so if you have any idea whats causing this i will chwck my o2 sensor today and replacing it with a spare and will also check my connections but please give me input on wat youguys think it might be

 

hopefully this works

 

misfire. no spark = raw fuel out the exhaust

 

When the a/f drops into 10's do you feel the car idle differently? change in tone, shakes a lil bit, etc...?

 

Is this all of the time, regardless of engine temp? Or, only right after startup?

 

the idle drops maybe like 100 rpms to 150 like barely with no vibration just that small change in idle when it drops to the 10's

plus

all this happens right after warm up of the car as soon as its up to the 14's 15's its starts dropping .....?????

 

Sounds like a misfire. Are you running colder plugs? Have you checked your gaps?

 

i have 1 step colder ngk's i checked the spacing when i put them in and set them at .34 i think..... but it wouldnt hurt checking them again

 

UTEC?

 

post ur map, this will help.

if u have a utec, make sure that u reflash it befor using it. even if its working fine with u.

 

ill get the map later today....and yes i am using utec....

 

I dont think its misfiring, otherwise you will definitely feel it shaking and it would be lean most likely.