View Full Version : rough idle.. could it be the o2 sensor?
04-16-2011, 11:40 AM
so i replaced my map and maf. still having a rough idle. when i unplug the maf sensor the car runs fine, but it idles at 900rpms so it slams into gear.
3 codes that come up at
p0101 mass air sensor circuit range/performance
p0131 o2 sensor circuit low voltage bank 1 sensor 1
p0171 bank 1 system too lean
so shall i replace the o2 sensor?
04-16-2011, 01:14 PM
Cleaned the iac?
04-16-2011, 10:10 PM
yup cleaned it and still rough idle. if i drive and come to a stop it idles at 1k rpms for like 5sec then goes to 500-650 and cant stay even. real rough. =[
04-17-2011, 10:03 AM
Figure out your lean code. That's what is causing your rough idle. NOT the O2 sensor. Besides... right now with the O2 sensor setting a code, the PCM is likely ignoring its input.
04-17-2011, 10:31 AM
well im currently visiting my gparents in florida so i dont really have alot of time during the day atleast to work on my car. but how shall i figure out whats lean? the air or gas? im pretty sure its lean on air, i can hear it suck in alot then rev up then nothing for a sec then its abt to stall so it sucks in more then nothing agn n abt to stall and just repeats. i got some sensor cleaner and sprayed all the sensors on the intake and cleaned the iac with carb cleaner and Qtips
whats under the iac? its right below it, kinda looks like it, same hex bolts. should i clean that too?
04-18-2011, 02:57 PM
so i drove my car today. its got a rough idle for the first 5miles. then it evens out but only by increasing the rpms. it idles at 1300 and the car is super sluggish. i have to get to abt 4k rms to get to 40. its terrible. and this all started after i put in my cai. and every new part like the map n maf sensor along with cleaning the iac seamed to make it worse. any ideas? apreciate it.
another random question, my oil type is 5w-30, 10w-30 thicker or thinner?
and my temp guage has been constant 215degrees since this problem and i have a 190 therm.... normal? because im in florida atm?
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