cats gone and a/f going crazy!?!
12-05-2006, 12:15 PM
#11
Originally Posted by trever1t
Not to hijack but...
I am looking at having the guy that did my inlet to TB fabrication make an all new y-pipe using the ultra hi-flow magnaflow cats as well...I found a website selling them for $89.50ea
gonna run it like this for awhile though...maybe p/u the cats before they go back up in price...
Last edited by Superado; 12-05-2006 at 12:21 PM.
12-05-2006, 12:20 PM
#12
Originally Posted by trever1t
Not to hijack but I am experiencing a similar issue but I have Magnaflow HiFlow cats. It reads 14.7~ most of the time then goes way lean (17) or sometimes even reads rich (13) randomly at light partial throttle??
Originally Posted by Superado
"3-No error reported" is what he did I believe...
side note...DJ WBC a/f sensor is installed in driver side post cat location...stock rear sensor is still installed on passenger side...
side note...DJ WBC a/f sensor is installed in driver side post cat location...stock rear sensor is still installed on passenger side...
Last edited by dewmanshu; 12-05-2006 at 12:34 PM.
12-05-2006, 01:18 PM
#13
so...the fluctuation is normal I guess...at least a/f w/o cats is compared to post cats before...
how about the "no report" sensor on the other bank...does it have any effect on anything when set to "no report" or does it still have an effect on something...just doesn't report it so it will not throw a code?
how about the "no report" sensor on the other bank...does it have any effect on anything when set to "no report" or does it still have an effect on something...just doesn't report it so it will not throw a code?
12-06-2006, 11:23 PM
#14
romped on it today going to work...watched the boost instead of eyes glued on the a/f...
ran @ 8#'s w/ cats...I expected to lose a little w/o cats...
it jumped to 5#'s...rising steadily (with a/f @11.5)
...6#'s...7...8...9...10#'s... ...I backed out of it...
fluke?
ran @ 8#'s w/ cats...I expected to lose a little w/o cats...
it jumped to 5#'s...rising steadily (with a/f @11.5)
...6#'s...7...8...9...10#'s...
...I backed out of it...fluke?
12-06-2006, 11:46 PM
#15
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how far back is the wideband from the collector? this can have a little do to with it. also, do you know what the guy set the PE enrichment eq to in hptuners? basically at WOT that table calculates what a/f ratio you're going to have. mine is somethin like 1.135 all across the board (14.7/1.135=12.95) meanin that once Im at WOT and the MAP is at 90 or above my commanded a/f ratio is 12.95. you can check the a/f error % while logging with hptuners. comparing the commanded afr to actual afr from your wideband.
running w/o cats will just let your exhaust flow more freely which will let you put more air into the motor and so on. I run cats to keep in compliance with emissions and my warranty
one more thing, when checking "no error reported" all you're doing is telling the pcm that if it isn't getting a proper feedback from the rear o2's then it'll just ignore it and not report an error or illuminate the ses light. they still function if you still have them plugged in. they dont really do anything except monitor temps post cat so the computer can enable COT protection (cat overtemp protection) and add fuel to prevent the cats from being overheated/the element destroyed. sorry for the long post, hope this helps.
jake
running w/o cats will just let your exhaust flow more freely which will let you put more air into the motor and so on. I run cats to keep in compliance with emissions and my warranty
one more thing, when checking "no error reported" all you're doing is telling the pcm that if it isn't getting a proper feedback from the rear o2's then it'll just ignore it and not report an error or illuminate the ses light. they still function if you still have them plugged in. they dont really do anything except monitor temps post cat so the computer can enable COT protection (cat overtemp protection) and add fuel to prevent the cats from being overheated/the element destroyed. sorry for the long post, hope this helps.
jake
12-07-2006, 12:08 AM
#16
Originally Posted by jakebdb56
how far back is the wideband from the collector?
Originally Posted by jakebdb56
they dont really do anything except monitor temps post cat so the computer can enable COT protection (cat overtemp protection) and add fuel to prevent the cats from being overheated/the element destroyed.
thanks!
12-07-2006, 12:18 AM
#17
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so im assuming that you dont have longtubes?
the driver side rear will show a richer afr without cats vs. with cats if im not mistaken.
basically, you need to disable COT protection and it should make it more "stable"
the wideband will still fluctuate a little at any rpm unless you're at WOT then you should have a pretty steady afr reading
the driver side rear will show a richer afr without cats vs. with cats if im not mistaken.
basically, you need to disable COT protection and it should make it more "stable"
the wideband will still fluctuate a little at any rpm unless you're at WOT then you should have a pretty steady afr reading
12-07-2006, 12:43 AM
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iono about the boost part.
COT basically adds fuel to richen the a/f so the cat wont get too hot, that's all it does. so if you dont have cats then you'll end up getting a richer commanded a/f ratio from the computer.
COT basically adds fuel to richen the a/f so the cat wont get too hot, that's all it does. so if you dont have cats then you'll end up getting a richer commanded a/f ratio from the computer.