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5th Gen second 02 sensor...

 
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Old 06-11-2010, 09:51 AM
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5th Gen second 02 sensor...

I get a code from time to time because of my aftermarket cat. I've read about the stacked up spark plug anti-foul adapters, but it doesn't look like it will actually fit without hitting the body. Also, I think it's a bad fix. I want to add a rheostat to feed the correct voltage down the signal wire so the ECU things everything is working fine. My problem is my car has been modified since 1999 and I have no clue what voltage a normal system sees. Does anyone have a clue what voltage will get me by or can someone measure it?
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Old 06-11-2010, 10:02 PM
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Re: 5th Gen second 02 sensor...

dude just get the spark plug defouler i have one because i have a test pipe and it works, you have to drill out one defouler and screw it into the other and it will get rid of the code because it recesses the 02 sensor from the flow of the exhaust.
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Old 06-12-2010, 12:27 AM
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Re: 5th Gen second 02 sensor...

I'll thread jack this shiz....

I was going to do the o2 spacer mod because I'm about to throw a test pipe on my car, problem is, it's supposed to make the car run leaner and my car (I'm pretty sure) already runs too lean. Sooooo would doing this be a bad idea?
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Old 06-12-2010, 02:27 AM
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Re: 5th Gen second 02 sensor...

Like I said it didn't look like it they would fit because of the angle my O2 is clocked on the cat, but since it looks like my only option is going to be try anti-foulers if they fit and if that doesn't work. I'll just have to slowly sweep the voltage until it works.

Never heard anything about it making the car run lean before. Also, how is it that you figure your car is running lean?
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Old 06-12-2010, 03:29 AM
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Re: 5th Gen second 02 sensor...

Los of power, chipped ecu, advanced timing, engine runs very hot, white and slightly melted spark plugs.

I don't know for sure, but everything seems to point in that direction.
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Old 06-13-2010, 08:42 PM
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Re: 5th Gen second 02 sensor...

Starting to sound like the chipped ECU is a bad idea from what I'm reading.

What mods do you have that made you chip the ECU? I would think until you port the heads and/or change the cams. The factory ECU would be fine to run, but I've only done every bolt-ons I can think of to mine, so I'm not sure.

Can you tell if it's lean everywhere or just in one area? Do you know how to read a spark plug? If it is lean all over then couldn't you just use and aftermarket fuel pressure reg to bump the fuel pressure a little. Then the same injector timings would flow a little more fuel and fix your lean condition.
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Old 06-13-2010, 09:41 PM
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Re: 5th Gen second 02 sensor...

the first O2 is what adjusts your a/f ratio. the second is just there to make sure the cat is working correctly.
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Old 06-13-2010, 11:56 PM
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Re: 5th Gen second 02 sensor...

Correct and my aftermarket cat doesn't work to it's standard, so it throws a code. Turns on my MIL and that cuts of the ATTS. Which is a safety hazzard when it happens in a corner if you are pushing it.
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Old 06-14-2010, 12:40 AM
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Re: 5th Gen second 02 sensor...

Well to whoever, asked, actually I doubt my ECU is chipped. Prolly something else. But yea unless you chip it right it will cause problems.

And to the OP, do the anti foulers, I'm doing them on my car, its an 01 type SH. And my ATTS has never worked lol
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Old 06-14-2010, 12:43 AM
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Re: 5th Gen second 02 sensor...

Quote:
the first O2 is what adjusts your a/f ratio. the second is just there to make sure the cat is working correctly.
This is correct. You don't even need the secondary 02 sensor. You'll throw a CEL without it, but it won't cause any problems.
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Old 06-14-2010, 12:48 AM
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Re: 5th Gen second 02 sensor...

Except for the fact that throwing an active CEL on an OBDII car will put it in limp mode, which reduces your cars power output. I forget what it does to do that, but it will reduce available power so you are less likely to damage the car til you get it to a shop.
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Old 06-14-2010, 12:59 AM
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Re: 5th Gen second 02 sensor...

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Except for the fact that throwing an active CEL on an OBDII car will put it in limp mode, which reduces your cars power output. I forget what it does to do that, but it will reduce available power so you are less likely to damage the car til you get it to a shop.
A faulty/missing secondary 02 sensor won't throw our cars into limp mode, even if OBD2. Mine's OBD2 and I have no problems, and I know others have the same deal going.
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Old 06-14-2010, 01:29 AM
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Re: 5th Gen second 02 sensor...

An active CEL (as in the light on) puts the car into limp mode.
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Old 06-14-2010, 05:05 AM
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Re: 5th Gen second 02 sensor...

Quote:
An active CEL (as in the light on) puts the car into limp mode.
No it doesn't. When a Prelude is in limp mode, it will not engage VTEC and cut fuel at 6500 rpms. My car throws a CEL constantly due to a secondary 02 sensor code, and I'm not in limp mode. If you care to argue more I will get you a video or something. I wouldn't lie to you man. Gimme a little credit here.
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Old 06-14-2010, 11:44 AM
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Re: 5th Gen second 02 sensor...

My textsbooks on OBDII state that an active CEL puts the car into limp mode. I had a CEL for emissions once, it decreased my power but the car still ran fine. It was very slight but there was a difference.

Unless of course I misremember what the book said, and I'm just making shiz up here. But I don't think so.
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Old 06-14-2010, 12:19 PM
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Re: 5th Gen second 02 sensor...

Talk to a shop or something about it. I called the guys at King a year or so back to ask about it, and even they said a missing/faulty secondary 02 sensor will cause no problems whatsoever even though it throws a CEL.
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Old 06-16-2010, 12:48 AM
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Re: 5th Gen second 02 sensor...

The thread jacker's problem has nothing to do with the O2 sensor. I've never lost power or had the motor run any different with the MIL on, but I don't want to go into that more. I woudln't want to help solve his problem at this point.

I am only worried about the MIL because it shuts down the ATTS unit. Killing my handling.
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Old 06-16-2010, 12:54 AM
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Re: 5th Gen second 02 sensor...

If it's the secondary 02 sensor, just get a CEL eliminator from King Motorsports, or use the spark plug defouler trick. That'll get rid of your MIL.
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Old 06-16-2010, 12:56 AM
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Re: 5th Gen second 02 sensor...

Well actually the reason I "jacked" the thread, had everything to do with the o2 sensor, and anti foulers, which was what you were asking about.

Then we were discussing whether or not having a CEL on all the time would do whatever it does, and now that I've thought about it, my problem with loss of power prolly wasn't from the CEL.

So I will concede to dbd's advice on this, yet again.

Annd why would a CEL shut down your ATTS? I wouldn't think of that happening, but then again I wouldn't know because my ATTS has never worked.
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Old 06-16-2010, 12:58 AM
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Re: 5th Gen second 02 sensor...

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So I will concede to dbd's advice on this, yet again.
I wasn't arguing just to argue, I don't do that. And If I'm wrong, I will concede to you. Yes, sometimes a CEL will throw you into limp mode, but not all the time. I think we should compile a list of CEL's that will/will not throw your car into limp mode...Maybe I'll do this when I get really ambitious on some rainy day...lol
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Old 06-16-2010, 01:41 AM
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Re: 5th Gen second 02 sensor...

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I wasn't arguing just to argue, I don't do that. And If I'm wrong, I will concede to you. Yes, sometimes a CEL will throw you into limp mode, but not all the time. I think we should compile a list of CEL's that will/will not throw your car into limp mode...Maybe I'll do this when I get really ambitious on some rainy day...lol
You smelled it didn't you? The sweet smell of defeat

Just kidding lol, I know you weren't arguing just to argue. I don't either, not anymore, but I do tend to split hairs.

That aside, I honestly thought active codes (CEL on) would throw you into limp mode, regardless of the code. However upon reflection when I had a secondary o2 sensor code I really didn't notice much of a difference, so I think any difference noticed was all in my head. I tend to do that.


And I do like the idea of compiling a list, and I would get my electronics book and double-check to see what it says, but it's down behind the couch right now and I'm too lazy to go get it lol.
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Old 06-16-2010, 01:44 AM
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Re: 5th Gen second 02 sensor...

Your car is either running fine, or in limp mode, there is no in between. I wasn't 100% on it either until I asked the guy from KMS about it.

On another note...that's just even more confusing for you... You're not throwing a CEL....but your car will engage VTEC and not cut fuel at 6500, but it's also running like ****... God I'm glad I don't have your problems.

Making any headway yet?
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Old 06-16-2010, 01:45 AM
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Re: 5th Gen second 02 sensor...

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Originally Posted by Crf450r420 View Post
I get a code from time to time because of my aftermarket cat. I've read about the stacked up spark plug anti-foul adapters, but it doesn't look like it will actually fit without hitting the body. Also, I think it's a bad fix. I want to add a rheostat to feed the correct voltage down the signal wire so the ECU things everything is working fine. My problem is my car has been modified since 1999 and I have no clue what voltage a normal system sees. Does anyone have a clue what voltage will get me by or can someone measure it?
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Old 06-16-2010, 01:56 AM
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Re: 5th Gen second 02 sensor...

Since the ATTS computer uses input from the ECU, it shuts down with any MIL light so it doesn't damage the ATTS unit or do something undesired.

I will check the fit of the spacer this weekend, but again, I doubt it will clear.

I looked at King Motorsports site and only saw a spacer for the O2. Didn't see an elimnator kit. Any chance I missed it and you have the URL?

Thanks for the useful input.
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Old 06-16-2010, 01:59 AM
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Re: 5th Gen second 02 sensor...

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Originally Posted by TheJGB3 View Post
There is some more good help. Thanks. That will be my second try after I double check the clearance this weekend.
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Old 06-16-2010, 02:11 AM
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Re: 5th Gen second 02 sensor...

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Originally Posted by dbd6604 View Post
Your car is either running fine, or in limp mode, there is no in between. I wasn't 100% on it either until I asked the guy from KMS about it.

On another note...that's just even more confusing for you... You're not throwing a CEL....but your car will engage VTEC and not cut fuel at 6500, but it's also running like ****... God I'm glad I don't have your problems.

Making any headway yet?
Yes I know there's no in between. Which is why I said it was prolly in my head.

And no, no headway yet. I think my ECU is chipped and they just unplugged the ATTS control module so it wouldn't throw a code or something. Beats me. Gotta fix all the other crap, then I'm gonna order a stock ecu and see if that helps.


Anyway to the OP, the anti-fouler only has to be done on the secondary o2 sensor. I think you already know this. On my car there is plenty of room, I forget what year yours is but it shouldn't be too different. And the parts for the o2 spacer kit are less than five bucks.
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You're such a whiny little douche sometimes, but posts like these make me love you.
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Old 06-16-2010, 05:46 PM
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Re: 5th Gen second 02 sensor...

JUST get rid of that cheap cat and go to an exhuast shop get a test pipe made make sure they weld an o2 bung on there and get a non fouler drill it out screw it in to ur test pipe then screw ur o2 sensor into the nonfouler and wha laaa no more CEL!
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