LT1-LT4 Modifications 1993-97 Gen II Small Block V8

o2 Sensor question

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Old Nov 29, 2010 | 09:35 PM
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Default o2 Sensor question

I have a built up 355 that is kinda runnin rich. Also when it first starts up when its cold it cuts out a little. When it gets warm its just fine. It runs a little rough in town as when it shifts in to overdrive it runs real rough kinda shakes. I have hooker headers and people are telling me i need front o2 sensors and that would help my problem out. Any advice?
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Old Nov 30, 2010 | 12:17 AM
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If you don't have O2s the PCM will default to fuel delivery on a "best guess" scenario. Additionally, your SES light should be screaming at you.
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Old Nov 30, 2010 | 04:19 PM
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^ what he said. thats why i plan on keeping my o2's
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Old Nov 30, 2010 | 06:14 PM
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[QUOTE=RamAir95TA;14179999]If you don't have O2s the PCM will default to fuel delivery on a "best guess" scenario. Additionally, your SES light should be screaming at you.[/QUO

I do not have o2 sensors at all they were deleted when the last owner put hooker headers on it and the there is no check engine light at all. It has been dyno tuned could that effect the deletion?
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Old Nov 30, 2010 | 06:30 PM
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Without knowing what has been done in the tune it's kind of hard to draw any conclusions. But not having O2s on a setup like yours makes zero sense.

Additionally, what are your mods?
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Old Nov 30, 2010 | 07:15 PM
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Originally Posted by RamAir95TA
Without knowing what has been done in the tune it's kind of hard to draw any conclusions. But not having O2s on a setup like yours makes zero sense.

Additionally, what are your mods?
Thats what i thought honestly. But they welded up the holes in the headers where the o2 senors go.

And all the mods i can think of is its 030 over with everything needed, ported and polished heads, roller rockers 1.6, lt4 hot cam, lt4 intake, headers, cold air intake, uhm it was totally rebuilt in 08, had a electric water pump that quit on me i went back stock due to money, and thats what i can think of. Its also been dyno tuned a while ago back when the motor was built.
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Old Nov 30, 2010 | 11:12 PM
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you got all the paperwork?
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Old Dec 1, 2010 | 02:43 PM
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Originally Posted by tricked94camaro
you got all the paperwork?
Yep I have most of it all.
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Old Dec 1, 2010 | 02:59 PM
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when u turn on the key do u see the check engine light ? just wondering if it is un plugged or burnt out
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Old Dec 1, 2010 | 10:36 PM
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Originally Posted by djjab57
when u turn on the key do u see the check engine light ? just wondering if it is un plugged or burnt out
It comes on when i turn the key on.
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Old Dec 1, 2010 | 10:37 PM
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probably got o2's deleted from the ecm
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Old Dec 2, 2010 | 12:21 AM
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Do you have a maf by chance?
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Old Dec 3, 2010 | 04:09 PM
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Originally Posted by BlackBird87
Do you have a maf by chance?
Dont know what is MAF is lol thats my bad.
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Old Dec 3, 2010 | 04:10 PM
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Originally Posted by tricked94camaro
probably got o2's deleted from the ecm
Thats what im guessing but it still runs like its running to rich so i dont know. Thinking about gettin new headers and running o2's....
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Old Dec 3, 2010 | 10:09 PM
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i would do just that unless you or someone else can weld some new bungs in the headers.

MAF- Mass Air Flow sensor.... between the TB and Air fliter
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Old Dec 4, 2010 | 07:42 PM
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Originally Posted by tricked94camaro
i would do just that unless you or someone else can weld some new bungs in the headers.

MAF- Mass Air Flow sensor.... between the TB and Air fliter
Ahh ic thats my bad. and yeah not sure which direction im gunna go yet.
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Old Dec 5, 2010 | 05:49 PM
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i would weld bungs into the hookers. make sure you have a bolt in the bung when u weld it in or the bung will warp.
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Old Dec 8, 2010 | 03:59 PM
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Originally Posted by tricked94camaro
i would weld bungs into the hookers. make sure you have a bolt in the bung when u weld it in or the bung will warp.
I have no idea what a bung is man.
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Old Dec 8, 2010 | 06:25 PM
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The bung is what the O2 sensor threads into. In reality a bung is the plug on a drum barrel and the female part of the drum is the bung hole. You can use a spark plug thread chaser for the bung hole. definitely get something to screw into them while you have them welded up so they don't get fubared
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