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Oil ruined o2 sensors?

This is a discussion on Oil ruined o2 sensors? within the General Help forums, part of the LSx Technical Help Section category; since i did my h/c/i swap on 98 ss. it has been throwin codes for o2 sensors and high idle. ...

  1. #1
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    Oil ruined o2 sensors?

    since i did my h/c/i swap on 98 ss. it has been throwin codes for o2 sensors and high idle. well it doesnt high idle anymore and it stopped after i tightened down intake a lil bit and i redid the pcv when i did swap but i did it wrong bc i didnt put the pcv valve near the throttle body. the car was goin through about a quart a week and the car wasnt running very good. everytime i looked there was a puddle of oil sitting against the throttle blade....well since i put pcv valve near throttle body it seems like it fixed it (no more oil goin through intake) its still throwin codes for 02 sensors. could it be that all that oil going through the engine ruined my 02 sensors? i had mail order tune done and got rear 02 deleted when i did header swap and i got the 02 extensions and already checked them. all good. i swapped out first set of 02s after install with other used ones and it still throwin codes.

  2. #2
    Moderator Firebirdjones's Avatar
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    02's are like spark plugs,,,they are part of regular maintainance and should be changed generally every 40-50,000 miles.
    Sometimes you'll find after a header swap that the used 02 sensors just won't heat up quick enough and you get heater codes as well.

    You didn't mention what 02 code you had specifically.

    I found after the header swap on my car I had a heater problem. Car only had 50K on it. A new set of sensors cured it.

    After the header swap on my wifes car it never had the problem, it also had 50K on it. Just depends on the car and how old the 02's are.

    If they are oil coated it also affects their efficiency, could be slow switching codes you are getting???

    In any event, if the car has some miles on it, and you've never changed the sensors, probably a good idea anyway to install new ones.

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by jmatt07 View Post
    could it be that all that oil going through the engine ruined my 02 sensors?
    Yes it could be and probably is.

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    I believe the codes were P0304 and P0504. i got them read at autozone. it was for no signal for 02s i believe

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    Nope. P0304 is engine misfire cylinder #4, which isn't used on a 98 F-body. P0504 also isn't used for this car. Not sure what that would be.
    P0131 P0132 P0133 P0134 P0135 P0137 P0138 P0140 P0141 P0151 P0152 P0153 P0154 P0155 P0157 P0158 P0160 P0161 P1133 P1134 P1153 P1154 are all the O2 sensor DTCs for the LS1

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    o ok lol. thanks for writing the possible codes, it made me remember. the codes were P0134 and P0154.

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    Moderator Cutlass's Avatar
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    Yeah those are both "O2 Sensor Insufficient Activity" for both the front O2 sensors. They could both be contaminated with oil deposits.

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    does it really matter what o2 sensors i get? are the bosch ones from autozone ok? they are like 70 a piece

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    Member va2001ss's Avatar
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    I just replaced mine with Denso's, Rock Auto has them for about 40 a piece.

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    Impounded
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    Quote Originally Posted by va2001ss View Post
    I just replaced mine with Denso's, Rock Auto has them for about 40 a piece.
    Heard good things about Denso and bosch. Though ive also heard that bosch runs a bit rich in some cases.

    Install a catch can?

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    well i ordered a catch can from kentucky speed but still havent got it. its been a couple weeks now. it doesnt seem to be puttin oil in the tb anymore since i actually followed your pcv right up the CORRECT way lol. i can tell the car isnt runnin to its full potential. like if im in first and hit it, it wont even spin the tires like it bogs down and accelerates slow till like 4k and then breaks em loose. im thinkin that its bc of the o2 sensors, at least im hoping so.

  12. #12
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    79 T/A -91 Firebird
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    hahah.

    I would take off the TB, clean it well, Seafoam DEEP CREEP the inside of the intake, seafoam the brake booster, get her cleaned out by driving it, then change plugs and 02 sensors. That way residual oil is gone .

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    Ive never even heard of seafoam....so i have to take the intake off and clean it?

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    Quote Originally Posted by jmatt07 View Post
    Ive never even heard of seafoam....so i have to take the intake off and clean it?
    dam...

    Nah just pop off the tb. It takes like 2 minutes.

    Youll see inside give it a light coat of Deep Creep by seafoam.

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    LSX whore allbaugh_04's Avatar
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    I bought a walker o2 from oxygensensors.com...working fine so far $45

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