02 sensors

**02sscamaro** · 04-08-2008, 06:58 PM

my car is acting funny i put lt headers in and i do have the bosch sensers. it feels fast then slow this happens every time i drive it. my light is on but thats the rear 02s. thats the only codes. can u check the 02s with the key in the on position? if i punch the code in my diablo tuner it will say slow switching. i had more codes for 02s but again this did not show up i punched it on the tuner

**sunsetorangess** · 04-09-2008, 08:19 AM

After a lt instail, if you used cermaic headers you may have fouled out your front two plugs due to the ceramic flaking. It will cause a "lazy" sensor or slow switching.
Take the sensors you had in the rear and try them upfront and see what happens.
Also post up your codes so we can drop you more info.
J

**02sscamaro** · 04-09-2008, 12:31 PM

the only codes i get is for the rear 02s.

**02sscamaro** · 04-09-2008, 05:58 PM

i just want to add i was in 2nd gear and i punched it and heard a pop or backfire from the front of the engine.

**02sscamaro** · 04-10-2008, 01:11 PM

anyone?

**02sscamaro** · 04-10-2008, 02:59 PM

like i said no codes but i pulled the 02s and they were black i mean black. when my car was down on power one other time the cats were bad and no codes. i need to figure this out before i dyno my car.

**TedsB4Csled** · 04-10-2008, 03:11 PM

Had that happen to me, fouled plugs after hedder & tune up. My O2 sensor was bad, black plugs from too much fuel.

**TedsB4Csled** · 04-10-2008, 03:12 PM

Front O2...and yeah my cat failed...

**02sscamaro** · 04-10-2008, 03:15 PM

i put new plugs when i did headers i checked the plugs they are white and my 02s are black??????? should have bought a big wheel

**TedsB4Csled** · 04-13-2008, 12:21 AM

You have a tune installed w/Diablo? Or stock tune?

**2000 ss** · 04-13-2008, 04:45 PM

its the stock tune. i scanned my o2s on the diablo when driving around and they were lazy and hanging. also i had a exhaust leak after the o2 where the collector meets the y pipe can that cause a problem?? i still am trying to find out if my o2s were black why are my plugs white as hell.??

**TedsB4Csled** · 04-13-2008, 09:16 PM

It's normal for them to be black, even if plugs are burning ok. You probably need a tune. A few other posts had same issues and a tune was suggested. Have you tried the Diablo tune? Any difference?

**2000 ss** · 04-14-2008, 05:19 PM

no i didnt put the diablo tune in. for sure its my 02s.

**TedsB4Csled** · 04-14-2008, 06:22 PM

Replace them both. How many miles?

**2000 ss** · 04-14-2008, 06:23 PM

45,000

**2000 ss** · 04-14-2008, 06:26 PM

i bought the bosch 13111 before i did my header install. again i ask if its running rich and killed my 02s my are my plugs white it should be tan right??

**TedsB4Csled** · 04-15-2008, 09:02 AM

This was interesting for cleaning O2's:
http://forums.bimmerforums.com/forum...d.php?t=324738

Grayish-tan to white is ok...
http://www.centuryperformance.com/sp...g-spg-192.html http://www.ngksparkplugs.com/techinf...q/faqread2.asp

**TedsB4Csled** · 04-15-2008, 09:11 AM

More on O2 sensor...read all of it...
http://www.kemparts.com/TechTalk/tt07.asp

**2000 ss** · 04-15-2008, 04:34 PM

thanks for the help. i will try to clean them i really don't want to spend $150 bucks. i lost the receipt so now i can get new ones.

**Firebirdjones** · 04-15-2008, 05:03 PM

Generally speaking 02's are maintainance items and should be replaced on a regular basis.

Most tuners say every 40,000 but I tend to stretch that a little bit.

But what you will find is,,,if you have sensors that are borderline and then install long tubes,,,,you will get those slow switching codes,,,,due to lazy 02 sensors being further down stream.
Only way to fix that is to install a pair of new ones. Unfortunately these new cars aren't cheap to maintain.