94 sentra studder problem

[Heavy_D]

ok i have a 94 5sp i changed lots of sensors and i failed the emissions, i changed the MAF,o2 sensor, couple on the intake, some coolant one i think, new spark plugs, new fuel filter, new wire and caps, and spark plugs, and a TPS sensor.

i have the paper here that they told me what failed, and it says HC, and NOx

HC-Primary system that affect HC(which is unburned fuel) include misture control, ignition and exhaust after-treatment. Primary feed sensors(such as 02,map/maf,tps,rpm and CTS) can be common causes of failure in newer vehicles. in addition, check ignition components, timing advance and fuel injectors.

NOx-Primary system that affect NOx(which is formed during high combustion temp) include mixture control,EGR, ignition and exhaust gas after-treatment. Primary feedback sensors(02, map, maf, tps, rpm ,and cts)

i dont know what is CTS but hopefully this weekend im going to get some injectors to see what happens, does anyone knows if these car has some thing called GM, or MAP sensors? i dont know where they are located.

thanks

[RED_DET]

You have a MAF, no map sensors. Have you tried cleaning out the egr?

[Heavy_D]

no not yet, but il give that a try, ill try to get a new one as well, thanks for the info.