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Technical question......

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Technical question......
Old February 14th, 2005, 07:26 AM   #1
 
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Technical question......

I have cut the cats out of my car....if I install O2 sims, will that cause my ECM to lean out my A/F?

As of now, I have no front O2 sensors, I throw a code every 3 or so months and my car is running super rich (dyno this weekend revealed that it dropped below 10/1). One reason was the plugs and the other reason may be contributed to my present O2 rear sensors have no "initial" reading of exhaust to make adjustments to my a/f.

I know someone will know.
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Re: Technical question......
Old February 14th, 2005, 08:15 AM   #2
 
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Re: Technical question......

you need to have the frt sensors hooked up at least...the rears are kinda along for the ride....put the sims on the rear sensors....
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Re: Technical question......
Old February 14th, 2005, 08:20 AM   #3
 
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Re: Technical question......

Quote:
Originally Posted by txlen
you need to have the frt sensors hooked up at least...the rears are kinda along for the ride....put the sims on the rear sensors....
thanks....so will that affect my ECM?
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Re: Technical question......
Old February 14th, 2005, 09:34 AM   #4
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Re: Technical question......

The rear 02 sensors just detect whether the cats are working. They do NOT affect the tuning of the car at all. Oh, you need the front 02 sensors for your car to run right.
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Re: Technical question......
Old February 14th, 2005, 10:15 AM   #5
 
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Re: Technical question......

Quote:
Originally Posted by ViperBing
The rear 02 sensors just detect whether the cats are working. They do NOT affect the tuning of the car at all. Oh, you need the front 02 sensors for your car to run right.


thanks....I was just making sure... :thumb:
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Re: Technical question......
Old February 14th, 2005, 09:26 PM   #6
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Re: Technical question......

Without the front O2's there is no control over a/f. My guess is the PCM would force the car rich. The question should be, why isn't the car throwing a code immediately. Why did you remove the O2's.
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Re: Technical question......
Old February 15th, 2005, 07:47 AM   #7
 
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Re: Technical question......

Quote:
Originally Posted by Jack B
Without the front O2's there is no control over a/f. My guess is the PCM would force the car rich. The question should be, why isn't the car throwing a code immediately. Why did you remove the O2's.
car throws a code, why not immediately? I just don't know and we can't figure it out. I went catless.
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Re: Technical question......
Old February 15th, 2005, 08:00 AM   #8
 
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Re: Technical question......

not throwing codes immediately kinda throws me too....it should throw codes almost right off the bat....kinda weird there....
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Re: Technical question......
Old February 15th, 2005, 08:52 AM   #9
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Re: Technical question......

Norm, you don't have your front o2 sensors in???
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Re: Technical question......
Old February 15th, 2005, 08:54 AM   #10
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Re: Technical question......

car would run horrible with them out. Lee most likely didn't mess with the front ones.
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Re: Technical question......
Old February 15th, 2005, 08:57 AM   #11
 
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Re: Technical question......

John,


this has been a huge misunderstanding...I took my front sensors out for a day (Installation reasons) and put them back in.....

I'M THROWING A CODE BECASUE my cats aren't out, not because my o2's are gone. I didn't elaborate on the post enough b/c I was half paying attention and just assumed that everyone knew that I wouldn't "permanently" take my 02's out.

what everyone was wondering was..how am I not throwing a code the second I start my car.

my view was...how am I not throwing a code more often than every 3 months for HAVING MY CATS OUT...

this has been a big misunderstanding.
My question was about the 02 sims which I will place in the rears so my car won't throw a code. However, I was wondering how the 02's work in that if I place them in the rear, my rear 02's won't have a "downstream" comparison and I'm wondering how that will affect my pcm's command to adjust the a/f?
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Re: Technical question......
Old February 15th, 2005, 09:03 AM   #12
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Re: Technical question......

gotcha. to the best of my knowledge rear o2's don't affect the pcm's altering of fuel in any way. Like someone said above they just let the pcm know if the cats are working, so the sims are supposed to take care of the sporadic code.


It does seem like the code would be more frequent.....hmmmmm, do you know what code number it is by chance?



John
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Re: Technical question......
Old February 15th, 2005, 09:25 AM   #13
 
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Re: Technical question......

P0432

that is the downstream cat code that I throw
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Re: Technical question......
Old February 15th, 2005, 06:45 PM   #14
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Re: Technical question......

Super Squirrel you have the simms ? i have a new one from Roe Racing let me know
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