Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

no matter what we do, car does 9.7 AFR

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Old Sep 21, 2004 | 09:08 PM
  #1  
Seal's Avatar
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no matter what we do, car does 9.7 AFR

Well, we have a wideband avaliable, so the numbers are pretty accurate
for AFR... here is our issue, maybe ya'll can help me out... well we did
the wideband, and no matter WHAT we change on the tables, we still get 9.7... we changed all the values on the PE vs RPM all the way from 2.0 to -25 and no matter what we do, the AFR stays at 9.7 at WOT, and as soon as we hit 4800-5000 RPMs the inj pulse goes way low (it goes from 18.91@5120 to 10.21@5471) this is on 42 injs by the way (i have tuned the injectors,
taht was a breeze) we changed all the values on open loop temp vs load
as well... no matter what we do, it just goes back to 9.7 AFR on
WOT... and cuts on the inj pulse at 5000ish so we get REAL lean... its
as if its changing to values to some default table or something that
we cant edit or see...
we lowered the timing and changed the inj size stuff, and it worked
all well, but we still cant figure out why its going to 9.7 AFR and
cutting on inj pulse which causes it to run lean and some knock...

would u know why this is happening?
Old Sep 21, 2004 | 09:16 PM
  #2  
Seal's Avatar
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Re: no matter what we do, car does 9.7 AFR

is 99.6 considered WOT? cuz thats what i get on my TPS %

also maf should be good, even though i keep popping up a stupid 'MAF frequency too high' or some kinda SES light =/
Old Sep 21, 2004 | 10:15 PM
  #3  
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Re: no matter what we do, car does 9.7 AFR

do you have an upgraded fuel pump ?
Old Sep 21, 2004 | 10:19 PM
  #4  
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Re: no matter what we do, car does 9.7 AFR

i noticed you mentioned the open loop tables, are you running a open loop tune, if so the pe tables are not uses in open loop and that would be why you cant chenge the afr under wot.

send me a bin file or a lt1edit file so i can look at it.
Old Sep 21, 2004 | 10:29 PM
  #5  
Seal's Avatar
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Re: no matter what we do, car does 9.7 AFR

Originally Posted by 97Z-M6
i noticed you mentioned the open loop tables, are you running a open loop tune, if so the pe tables are not uses in open loop and that would be why you cant chenge the afr under wot.

send me a bin file or a lt1edit file so i can look at it.
where can i send it?

http://lt1tech.com/cgi-bin/ultimateb...=000217#000003

that sounds like my problem...
Old Sep 22, 2004 | 06:30 AM
  #6  
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Re: no matter what we do, car does 9.7 AFR

vincentbergeron@yahoo.com
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