O2 sensors max and A/F goes very rich during deceleration. How do I fix it?
09-01-2011, 01:44 PM
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O2 sensors max and A/F goes very rich during deceleration. How do I fix it? Swapped my LTs for stock manifolds. Did it due to the crappy noise laws in Germany. With the LTs the AFR would dip to about 11.8-12.8 during decelerations with the throttle closed.
Now, the AFR dips down to 10.2 or so. What is causing this? I attached a scan from today. What jumps out is during each decel the O2s max out like at WOT, showing 800+. My LTFTs also spike (though not always), but only on bank #1.
So...any $0.02 how to tune around this or what is even causing this to occur.?
Opinions appreciated. Graph is shown below
Now, the AFR dips down to 10.2 or so. What is causing this? I attached a scan from today. What jumps out is during each decel the O2s max out like at WOT, showing 800+. My LTFTs also spike (though not always), but only on bank #1.
So...any $0.02 how to tune around this or what is even causing this to occur.?
Opinions appreciated. Graph is shown below
09-02-2011, 12:27 PM
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Well, I've been working around this phenomenon through the VE table and throttle cracker.
However, am I the first LS1 owner to ever have this problem? I can't believe there wasn't a single post...........
However, am I the first LS1 owner to ever have this problem? I can't believe there wasn't a single post...........
09-02-2011, 01:04 PM
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Maybe your minimum pulse width is forcing the injector
open more than it really needs. That is common with
people who have upsized them.
DFCO will just cut them out entirely but that can be
annoying for bucking if you don't tweak the entry /
exit / hysteresis right.
open more than it really needs. That is common with
people who have upsized them.
DFCO will just cut them out entirely but that can be
annoying for bucking if you don't tweak the entry /
exit / hysteresis right.
09-02-2011, 05:32 PM
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Thanks for the idea.
