My car has been running great ever since i put 1/3 bottle of seafoam in the engine about a week ago, the knocking was cured, and the car just seems to run smoother. I have an aem cai, dc 4-1 headers, blitz exhaust and thats it. While driving home today my cel came on and i read it as code 45 system too rich/lean.

What could be causing this? when i did the seafoam treatment i pulled the plugs and replaced them with some older ones, i installed my 4-1 headers yesterday, and did another 1/3 bottle of seafoam now i get this cel 45 what could be causing this?

 

I started throwing this code about a month ago right of the blue. My mechanic said I was throwing the code in bank 1, or the first o2 sensor ( I am OBDII). I replaced the sensor only to have the code throw again after 80 miles. It now rotates: about 80mi on, about 80 mi off. Any suggestions?

I want to seek more advice before buying anything else. Thanks

 

I have the same CEL but i' running an SMSP header AND exhaust lol so i think its probably true. Even though I had it tuned, i wish I knew more about electrical stuff like checking the o2 sensors but i don't, so i just drive with the CEL light on lol

 

Change the primary O2 sensor, then have someone hook up a wideband to find out your AF in closed loop, if it's too rich, the new sensor will foul and you'll get the code again.

 

im gonna switch out the o2 tomorrow and see if that works

 

Same thing here too. It still acts normal when the light is on, then goes away for a bit only to come back on.

 

my o2 sensor had to be extended because of the size header i'm using, so i'm kind of scared that if i get a new one and then reextend this one it will do the same thing. how much are o2 sensors anyway??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boondock Saint &raquo;</TD></TR><TR><TD CLASS="quote">Change the primary O2 sensor, then have someone hook up a wideband to find out your AF in closed loop, if it's too rich, the new sensor will foul and you'll get the code again.</TD></TR></TABLE>

I didn't know you could foul an O2 sensor, interesting. Here is my deal: I have been throwing the code for a while and replaced the primary O2 sensor. It worked fine for about 80mi and then I have been throwing the code ever since. Have I fouled the new O2 sensor?? If yes, then am I out another O2 sensor? What should be my next step because I was starting to think I had a vacuum leak or something.

I have been using this thread for diagnosis: http://www.team-integra.net/fo...earch

Any help would be greatly appreciated. Thanks to all.

-Ryan


Modified by coolhandluke at 2:45 PM 7/22/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by coolhandluke &raquo;</TD></TR><TR><TD CLASS="quote">I didn't know you could foul an O2 sensor, interesting. Here is my deal: I have been throwing the code for a while and replaced the primary O2 sensor. It worked fine for about 80mi and then I have been throwing the code ever since. Have I fouled the new O2 sensor?? If yes, then am I out another O2 sensor? What should be my next step because I was starting to think I had a vacuum leak or something.

I have been using this thread for diagnosis: http://www.team-integra.net/fo...earch

Any help would be greatly appreciated. Thanks to all.

-Ryan


Modified by coolhandluke at 2:45 PM 7/22/2005</TD></TR></TABLE>


Yes. Take the sensor out and inspect it. If it is fouled with soot from running rich, blow it off with compressed air and put it back in. You can also check the signal with a digital volt meter, the signal should be about 0-1 volt reciprocating rapidly when the engine is idling and at normal temp.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boondock Saint &raquo;</TD></TR><TR><TD CLASS="quote">Yes. Take the sensor out and inspect it. If it is fouled with soot from running rich, blow it off with compressed air and put it back in. You can also check the signal with a digital volt meter, the signal should be about 0-1 volt reciprocating rapidly when the engine is idling and at normal temp.</TD></TR></TABLE>

Couldn't he also be running too lean, causing the o2 sensor to throw the code 45? If the o2 became too fouled I would think it would throw a code 43. If the o2 sensor isnt fouled, I would check the fuel pressure both before and after the filter.

 

sounds like you may have fouled out your o2 sensor. i'm pretty sure most ppl take out their o2 sensor when they use that seafoam stuff.

 

well i changed my o2 sensor and the cel has not come on again. What i ahve been doing is taking a piece of sand paper to the o2 sensor if its really fouled to take off some of the deposits and spray it with carb cleaner.

After that treatment the O2 sensor works like new, i have heard you're not supposed to do this but hey it works for me

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mythias &raquo;</TD></TR><TR><TD CLASS="quote">Couldn't he also be running too lean, causing the o2 sensor to throw the code 45? If the o2 became too fouled I would think it would throw a code 43. If the o2 sensor isnt fouled, I would check the fuel pressure both before and after the filter.</TD></TR></TABLE>

I am starting to think I might be running too lean. I am visiting some family all day, but when I return I am going to pull my plugs. This should confirm whether or not I am running too rich or too lean.

 

Pulled the plugs last week and I was running lean -That night my car died when leaving church and I ripped out my fuel cut off switch find that my radio shack switch had shorted out. Replaced the switch and all my problems were solved.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by coolhandluke &raquo;</TD></TR><TR><TD CLASS="quote"> My mechanic said I was throwing the code in bank 1, or the first o2 sensor ( I am OBDII). </TD></TR></TABLE>

ha ha ha ha....bank one huh?

youve really got problems if he tells you its in bank two....

 

i threw the same code a while back when i sucked up some water through the intake. i plugged the obd2 computer to my car to see what was causing the problem and it was showing that i was not sending or receiving any voltage to the first O2 sensor. I replaced the sensor erased the code and it never came back.

p.s. i was also running extremly rich and the car could not idle it was boggin out