o2's on a 93 gt ???

[southernstang97]

I got a good one for u guys ,,, do the o2's on a 87 to 93 reading like the 4.6 o2's. What I am meaning is do they take readings the whole time or just at start up.... please let me know how these things work on this 5.0

thanks

 

[HISSIN50]

To my understanding, the O2's on an OBD-I 5.0L stang do read at all times. However, their info is not used by the computer to trim fuel until they light off. And being HEGO's, they take 30-120 seconds to light off from a cold start up.

On fox III's, the O2's are ignored at WOT, whereas on 5.0L Fox IV's, their input is utilized at WOT.

We dont have the secondary O2's (number 3 and 4) to monitor the efficiency of the emissions components, like the OBD-II mod-motor cars have.

And all O2's are used once the car is warmed up - some just dont use the info at start up. Your phrasing has that backwards.

Good luck.

 

[southernstang97]

i am asking because my car has a s/c on it and it was tuned with out the o2's hooked up , we al thougt that they where hooked up but come to find out they where not , the tuner is telling me it is up to me if I want to get the car retuned with them hooked up but will cost me a retune fee ,,, but he said the car was tuned with them off and that the 5.0 do not need them ,,, i am not sure what I should do ????

 

[Mustang5L5]

What he said X2

 

[Michael Yount]

....see the thread at corral.....

 

[Mustang5L5]

Linky to corral??


I'd like to edumacate myself on this as well!

 

[Michael Yount]

http://www.corral.net/forums/showthread.php?t=741094

 

[85mcLaren]

Hissin,
I was under the impression that even on the EECIV 5.0's - the O2's are NOT used on WOT. Am I wrong on this ?

Jason

 

[HISSIN50]

Hissin,
I was under the impression that even on the EECIV 5.0's - the O2's are NOT used on WOT. Am I wrong on this ?

Jason

Um, foxes are 5.0L EEC-IV - I think you are talking about 94-95's (fox IV's). From what I gather (my interpretation of Mr. Wesley's articles, lookin at lambda readings during datalogging [and seeing the values walk] and reading posts, that is my take). I am pretty sure of it, but you could read the articles or just ask Grady (the 5.0L SN95 TwEECer guru IMHO).

 

[Black1987Stang]

If he tuned the car dont they look at the air/fuel ratio so they know how to modify the tune? If the 02s werent hooked up I dont see how the tuner could tune it properly?...

 

[Michael Yount]

"...dont they look at the air/fuel ratio..."

Not his year car at wide open throttle....

 

[Black1987Stang]

"...dont they look at the air/fuel ratio..."

Not his year car at wide open throttle....

O ok