Is it ok to drive without O2 sims for a while?

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Apr 3, 2005 | 11:59 PM

2kta--89formula

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From: Deland, Florida

Is it ok to drive without O2 sims for a while?

I am going to be installing some gutted cats on my car and I have O2 sims on the way but it might be a couple days before they arrive. Will it hurt anything to drive around without the sims? I realize that the engine light will come on, but will it affect drivability <timing, fuel, etc...>?

Apr 4, 2005 | 01:43 AM

hpjunky98

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no i think the ses will just be on..never heard of anything else happening...

Apr 4, 2005 | 02:06 AM

soundengineer

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From: Chicago IL

No issues...but you will most definately have an SES light....
It is safe to drive without your rear 02's...I drove mine for 3 weeks like that because of a shipping mistake

Apr 4, 2005 | 02:58 AM

OnE Ls1 2 HaTe

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From: Modesto, CA

i had my cats gutted and never got o2's sims. u might run a little rich....

Apr 4, 2005 | 07:57 PM

blcblurry

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wont it cause your car to run too rich and possibly burn a whole in the top of your pistons?

Apr 4, 2005 | 08:43 PM

psykoTA

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From: Central FL

Quote:

Originally Posted by blcblurry

wont it cause your car to run too rich and possibly burn a whole in the top of your pistons?

No, the rear O2's monitor the cats, thats all. They do not affect the fuel or timing. They just tell the comp if the cats are working or not.

Apr 5, 2005 | 10:49 PM

soundengineer

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Quote:

Originally Posted by OnE Ls1 2 HaTe

i had my cats gutted and never got o2's sims. u might run a little rich....

actually...thats kind of a myth...especially with a computer controlled car....

old school carburated cars...yes...you usually run a little rich.... even the first few computer controlled cars you run a little rich....
but with an ls1...you dont run rich....you run stoich..14.7 its always looking at your first pcm....all the time...and WOT is determined by your tables in your pcm...which is around 12-13ish

i

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Apr 5, 2005 | 11:18 PM

psykoTA

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From: Central FL

Quote:

Originally Posted by soundengineer

I think people confuse rich for running dirtier. Without cats, your emissions will be higher, i.e. more HC in the exhaust, and HC are unburnt fuel. So you are not necesarrily running rich as now that you have no cats, there is nothing to burn up the extra unburnt fuel.

Now adding LT's tends to make the cars go slightly richer I believe.