s14 sr running rich

[fast_s13]

alright so my car is running extremly rich the smell of raw gas and black smoke coming out the exhaust... my question is would the 02 sensor cause this.... it does it when its cold or when its warmed up...also i have a z32 maf and afc i have taken 10% out from idle to 1800rpm.. it did it with the stack maf as well.... anyone know of anything to check?

[cheapscheisst]

do you have a wideband?

[S13FASTBACKSR]

did it with the stock maf as well? are you sure you have your afc set correctly? yes the o2 sensor when bad will cause this problem..is the car misfiring at all or doing anything else other than running rich?

[fast_s13]

no i do not have a wideband....and yes it did it with the stock maf....the afc is sett up correctly....i guess ill have to spend $100 on a o2 and see if it helps

[S13FASTBACKSR]

maybe an o2..does it misfire? if it misfires then its probably not an o2..more along the lines of fpr or tps

[fast_s13]

yeah it misfires pretty bad i just drove it.... i checked the tps and it was at 4.3 at wot i set it to 4.5 at wot..... so maybe fpr?

[fast_s13]

also the car wont idle constant.. it idles between 700 and 1200... i've cleaned the iacv,checked for boost leaks, reset the tps....also my ecu dosnt have a led.. why is it s14 dont have it?

[S13FASTBACKSR]

all of these things you left out lol..bad idle and misfiring changes the game..your tps is 4.5v at w.o.t. and .45 to .55 at idle? check the idle voltage..also just for the hell of it check your maf voltage..you should have a 12v, 5v and ground of course ..2 of them with the z32..if it all checks out check your timing and spark plug gap first..easy fix if thats the problem and it doesnt cost money..if that checks out go to your ignitor and coilpacks voltage and continuity..if they are good i would look into your fpr or ecu

[fast_s13]

well i left all those things out cause i havent really drove the car ive been tryn to figuar out whats wrong with it.... anyway i checked my maf and im getting 12 volts for power but only putting out 1.27 volts on the signal wire....also my tps reads 76 or so at idle when it it set at 4.50 volts at wot.... if i change it to .55 volts then i get about 4.30 at wot

[S13FASTBACKSR]

were these readings with the car running or key on? i believe you are supposed to get 5v when the engine is running and when the key is on..leave your tps at the .55v at idle and 4.3 at w.o.t...have you checked all of the other things i mentioned? ignitor, coilpacks, timing, spark plugs

[fast_s13]

i check the tps with the key on and the maf with it running...i also cleaned the maf and same results..i know the plugs are fine i just put them in and gapped them to .08mm.... i havent checked the other things cause i figuared it is the maf..also i cant check the timing cause i cant get a steady idle

[S13FASTBACKSR]

oh ya forgot you cant check the timing because of the idle...so what you could do in this case is just move the CAS around and see if the car idles better if it does lock it in because thats how you adjust the timing..thats one way to tell if the timing is the problem...but .08 is that a mistake? did you mean .28 because thats about what it should be depending on how much boost you are running..should be anywhere from 28 to about 32

[fast_s13]

i have moved the cas around tryn to get it to idle better... and .08mm is about 30 thousands...im gonna have a new maf tomorrow...so ill give that a try and see what happens

[DuckyD]

I had this happen to me before when my BOV fell off (lol, stupid c-clamp) and I had to drive the car .5 miles to the shop. The car was spewing black smoke and would barely move.

So in other words, check to make sure that you don't have any intake/boost leaks.

[fast_s13]

alright so i put my known good maf on my car tonight and still reads 1.30 volts at idle....but good news is i got it running a heck of alot better....i changed my afc from 2 in 6 out to 2in 5out set my tps to .55 at idle insted of 4.5 at wot..... i was able to get a steady idle to set my timing then...and it was far off!!!!so im kinda puzzled why my maf is only reading 1.30 volts.. im wondering if the afc has somthing to do with it.....if any one has a z32 maf and a afc could you please check the voltage at idle for me and see what you have

[S13FASTBACKSR]

i wanna say the white wire reads different when the engine is running versus the key being on

[fast_s13]

i dont think it will read anything with the key on since it sends a signal to the ecu as it reads the air entering the motor

[S13FASTBACKSR]

ya your right man im sorry..good point..i would do like you said and try to check around for people with a z32 maf and afc to see what their readings were

[240sxproblems]

Try to check your injectors. If you have fuel going passed the lower o rings on the injectors then that would cause this problem also.

[S13FASTBACKSR]

yes 1 or 2 of your injectors may be putting in too much fuel..an easy way to find that out is to pull your spark plugs and if 1 or 2 of them are considerably blacker than the others then the cylinder that plug came out of has a bad injector