my crx runs fine until it reaches temp after wards i get middle sputtering and mild backfire and runs fine after reaching rpm ranges in each gear usually towards upper end.

any ideas thanks

 

try cleaning the iacv
replace the pcv valve 4.00 5 minutes
What engine do yo have?

 

i have a 95 obd1 d15b engine in my 88si crx
and im going 2 the store now and see if this fixes my problem

 

Did you try it? use carn cleaner.
Is your idle too low?
/how's your timing

 

i understand how 2 match the timing on the gear idk how 2 find tdc

 

align the crank pulley mark with the nipple on your t belt cover.
and align the cam gear marks with the head. Will look like this_I_ <-cam gear
' nipple
. crank pulley mark

 

pop the distributor cap off and the rotor will be pointing at spark plug wire # 1

 

i got the pcv but havent replaced it yet but
i hooked the ecu up and have a code 2 and 5

code 2 is oxygen content B and the code 5 is map sensor so my question is what components are responsible to trip a code2?

 

your o2 sensor.
If you have d16, it's on the header
B series I'm not too sure,
They're pricey but bot much because it's one wire. You need a special tool to remove it but they rent them at auto stores

 

hooked in the pcv valve and have same results idle is mildly better im going 2 try and look at timing in a bit. would the o2 sensor cause lower end problems because once i take off from stop and get pass the BS after 3k rpm or so it stops and acts right

 

o2 sensor failure will cause poor fuel mileage as it typically forces extra fuel with out proper readings. As far as your map sensor its on the firewall or top of throttle body. what ECU are you using?

 

i have a 95 d15b from an eg9
i have obd0 - obd1 rywire conversion
p28 ecu i think i have vtec
in my 88 crx
i replaced the pcv valve and that helped a bit but still no dice

 

you would know if you had vtec when it engaged.

your sputtering problem is caused by the O2 sensor, i have the same problem, swap that and you should be good to go. check your timing also though just to be sure its on point.

map sensor, could be a bad sensor, idk if you have it at the tb or the firewall but try swapping it for one at the junkyard and see if it helps, check the vac lines too.