wifes car cant get rid of CEL
 

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!!!!!

Re: wifes car cant get rid of CEL
 

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

Re: wifes car cant get rid of CEL
 

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.

Re: wifes car cant get rid of CEL
 

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

Re: wifes car cant get rid of CEL
 

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

Re: wifes car cant get rid of CEL
 

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.

Re: wifes car cant get rid of CEL
 

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 ----

Re: wifes car cant get rid of CEL
 

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

Re: wifes car cant get rid of CEL
 

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

Re: wifes car cant get rid of CEL
 

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

Re: wifes car cant get rid of CEL
 

if u have a scanner why don`t u plug it up and take it for a drive and check all the readings

Re: wifes car cant get rid of CEL
 

yes you only have bank 1, obdII ownes you :1. If you have a universal 02 sensor I would start there. If it checks out then do just like you would anything else when checking for running rich, fuel pressure, compression, tune-up, bluh bluh bluh.

Re: wifes car cant get rid of CEL
 

friend has a scanner he let me borrow for a minute to scan code

Re: wifes car cant get rid of CEL
 

when i had the scanner hooked up i did datalog it and the reading was like .84 volts which is low but didnt drive it to see if it had full sweep or not getting 2 other o2's in a couple days so i will run checks of everything else till then

AND YES OBDII DOES OWN THE ---- OUT OF ME!!!!!!!

Re: wifes car cant get rid of CEL
 

ok put an upstream and downstream o2 in it and still same thing. clean out fpr and reset ecu still lost any other sugg.

Re: wifes car cant get rid of CEL
 

if your tps is reading wrong it might be adding to much fuel, you could also have a leaky injector, check your plugs for fouling

Re: wifes car cant get rid of CEL
 

if your tps is reading wrong it might be adding to much fuel, you could also have a leaky injector, check your plugs for fouling it could also be the cat, its job is to burn the unburnt fuel, if its not firing it would give u rich reading on the downstream,

use a infered thermomiter to check the temp of the cat when it is hot, you should be about 40% hoter on the back side of the cat

Re: wifes car cant get rid of CEL
 

just take the bulb out..problem fixed

Re: wifes car cant get rid of CEL
 

cant do that as i am trying to get the car through emmisions. it would have been no problem if they still did obd II cars through the tailpipe still but they hook it up to the diagnostic port now. thats why i am trying to fix it.

Re: wifes car cant get rid of CEL
 

You can use the scan tool to erase the error code. I've used a Snap-On scan tool and it has the option.

Re: wifes car cant get rid of CEL
 

have already done that.that isnt the problem i cant get rid of it because of a rich condition due to the fact that obd II OWNS ME!!! read the whole post i am open to your opinions

Re: wifes car cant get rid of CEL
 

Did you make sure the universal O2 sensors were wired properly? After reading all the posts, the only thing I have to add is a faulty fuel pressure regulator or fuel return line. Before you check the FPR, disconnect the negative battery cable for about 30 seconds. Reconnect it, start the car and see if the light is still on. If the light is still on (based on all the parts you've changed) ask someone that have access to Alldata or Mitchell on Demand to check and see if there was a Technical Service Bulletin (TSB) that was issued for 1998 Civics regarding this check engine light issue.

Re: wifes car cant get rid of CEL
 

had a universal o2 just swapped out for ubstream and downstream oem o2's
have already checked micthell and was following most of its guide lines checked the stock fpr but now have another to replace it with. havent checked the return line as of yet but i guess thats my next option. anything else to look for that maybe i have left out.

Re: wifes car cant get rid of CEL
 

I suggested you check for any Technical Service Bulletin (TSB) but you did not state if you did. See link below for some information I found online. Read the summary for the cause of your problem.

You can verify the information by checking the TSB section in Mitchell on Demand.


http://www.hondacivicforum.com/recal...010202/TSB.htm

Re: wifes car cant get rid of CEL
 

i have been thinking of changing out the injectors and now after reading that i will make that top priority!!! thanks for the link!!!!

Re: wifes car cant get rid of CEL
 

ok i finnaly got around to swapping injectors and BANG!!!! that was the fix for the rich code!!! THANKS GUYS FOR THE HELP!!!! but now i am getting code 67 which is catalyst system.is there anyway around this before replacing the cat any further help is greatly appreciated!!!

Re: wifes car cant get rid of CEL
 

no problem, when my cars fucked you better have my answer

jk

Re: wifes car cant get rid of CEL
 

any thoughts

Re: wifes car cant get rid of CEL
 

if uv been dumping fuel in it for a while it will be cloged up, tray taking it foar a nice hot rip on the highway if that doesnt work you prob have to replace..

just get a universal put in for like 110

Re: wifes car cant get rid of CEL
 

found a used cat by chance at a buddies shop and put it on and that was fix no more CEL and got through emmisions with honors.

THANKS ONCE AGAIN TO EVERYONE THAT HELPED ME IN MY TIME OF DESPERATION!!!!!!!!