sikcrx89

alright first off car is a 98 civic lx just basic intake,exhaust, keeps giving me code po172 which is (sytem rich) in haynes manual and on strap-on scan tool (system rich bank1) but anyway had a hairline crack in manifold (repaired with manifold sealant) put a new universal o2 in it last year and just changed map sensor last night and code still comes back.now i was thinking maybe an injector was stuck open flooding bank 1 with fuel that the ecu cant compensate for but almost out of ideas and i live in virginia so now that the emmisions test for obd II cars have to hook up directly to the obd port i have to have this light gone in order to pass. any help is greatly appreciated!!!!!

idiot-stick

if you are thinking an injector is stuck open, check your spark plugs to see if they all look the same.

sikcrx89

just did a tune up about a month ago and code has been there longer than that so i know plugs should still be good but will check them anyway any thing else i should be looking for or what else it could be going to check injectors and plugs tomm. i have another set of injectors and a set of iridium plugs ill throw in it.

88crxSi

swap cyl 1 injector to 4 and see if the code changes to cyl 4. ?

sikcrx89

the code is for bank 1. isnt bank 1 cylinders 1and4 considered bank one like the pwo and pr3 jdm b16 that the ecu reads from 2 banks instead of one could be wrong but enlighten me

JDMFantasy2K

you could also get a fuel pressure gauge on it and see if the pressure dropps when the car is off, which will show a leaking injector.

Zeniceguycrx

if your civic is a 4 cyl then you only have bank one
in a v6 or v8 u have banl 1 and bank 2
you have a upstreaM and maybe a downstream o2
check your egr valve it may be malfuntioning, and can cause a rich condition
i do emmisions repairs at work and we get a lot of egr valvs some sticking or even the egr port could be cloged and ----

sikcrx89

the 1st gen b16's read off of 2 banks and its a y8 motor so there is no egr valve at all

sikcrx89

and yes it has an upstream and downstream o2's most all obdII cars do at least honda's do

Zeniceguycrx

have u replace both? when one isnt working prop it can condem the other aswell or buy it self