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Discussion Starter #1
I put a set of SPL long tube headers on my 86 Vett.

the headers came with a 3 wire heated O2 sender I put the stock 1 wire O2 sender in I was not sure at the time which wire did what.
But now I know.

I just checking is the NON heated O2 sender causing my motor to surge at Idel it ok at first at a stop light or in stop and go trafic but after a minute or two it starts surging.

After you able to give it some gas the surge go's a way.

I been thinking the 1 wire O2 is getting cold that cause the surge due the sender now in the Header collector instead of next to the old stock Exhaust manifold.

Or what else would cause this it a new motor not stock it's a mild build I still working the bugs out the new build this is one of them.

But I getting there.
 

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One way to find out ;
hook the 3 wire O2 up to keep it in closed loop
Well documented that O2 sensor by the collector in LT's goes cold at idle so engine goes open loop
 

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Make sure the intake is all buttoned up tight,

And check wire harness out real good, Even inside the wire conduit,

The IAC may need to be re-programed,

It's been a few years since I owned one of these motors, So I'm not that fresh
 

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Discussion Starter #5
I guessing the IAC needs to be programed though the chip.

Make the intake is all buttoned up tight,

And check wire harness out real good, Even inside the wire conduit,

The IAC may need to be re-programed,

It's been a few years since I owned one of these motors, So I'm not fresh
 

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Discussion Starter #8
As normal my luck sucks.

The 3 wire O2 is bad.
 

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As normal my luck sucks.

The 3 wire O2 is bad.
Well atleast you got it fixed,

And wern't Prey for the Local Mechanic :laughing:

I just found my problem with my Traction Control/Abs lights and Made the repair there

No more Tcs lights on the Ipc

I buttoned it up Tight this time

So you know I'm celebrating with you :nuts:

Bon
 

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Discussion Starter #12
Installed a new Bosch O2 3 wire sender Part # 13077.

The surge is gone now.
 

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I told yah Bro
Bro
You told him jack sh*t ;
Make sure the intake is all buttoned up tight,
And check wire harness out real good,
The IAC may need to be re-programed,


Correct answer was back in post # 3; a well known problem with LT headers
 

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I'll leave yah stuck on stupid then
:WTF
By your own admission

"So I'm not that fresh "

so maybe you should stay over in OT and News Room and leave the fault finding to people who actually "know" what they are talking about ; not just guessing
 

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Uuuhhh....Vetteoz you'r direct,very direct...:laughing:i've learned my lesson,now i just ask and listen...don't talk:laughing:
 

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Discussion Starter #18
Question others are telling me to put a updated ESC and Knock sencor Why and is it worth it.

The car runs good now.

They are saying the stock 1986 ESC iand Knock sender hearing the headers ect now and retarding the spark advance back and a new up dated ESC will make the car work better.
 

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Question others are telling me to put a updated ESC and Knock sencor Why and is it worth it.
The car runs good now.
They are correct ; the updated unit is "better"
Do you need it ? that is up to you.

I have run many combos ( full rollers and LT's) ; some over 400Hp with the stock original unit
I have had knock counts in areas like hi load WOT where I would expect knock counts with a perf setup
I have made adjustments in the tune for such

Datalog the engine ;
that will tell you exactly what is going on ( would have shown your previous idle problem the O2 dropping out at hot idle) and decide on course of action needed from there.
If you are showing knock counts in unexpected areas like idle then the upgrade may be worth it
 

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you'r direct,very direct...:laughing::
Quiet at the back of the class :smack

Actually I spend most of my car time with Italians so lucky you can't use hand language on the net
 
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