Running LEAN
#1
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Running LEAN
I just changed my hole exhaust. I put my headers and put my LM and took of my cats. Can this cause ur car to run lean or could it be from a bad 02 sensor. What can I do 2 fix this because my car felt faster before i changed my exhaust.
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I checked my super chip tuner and it said that- sys to lean (bank 1 and 2) it also says- catalyst efficiency below threshold( bank 1 and 2).
#4
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Originally Posted by Manny Fresh
I checked my super chip tuner and it said that- sys to lean (bank 1 and 2) it also says- catalyst efficiency below threshold( bank 1 and 2).
Did you delete the rear O2s, or install sims? If not, that's where the cat eff low codes are coming from. With cats removed you should also disable cat overtemp protection (if you haven't already).
#5
Kleeborp the Moderator™
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Originally Posted by daryl2cb@yahoo.com
you will lose some low end with the headers, but you should be running rich, usually headers do that. I would look to a tune.
I would bet that it is all in the tuning...my car is faster all around with headers, but it took the tune to do it. I only gained like 1 MPH and dropped a little more than a tenth off my track times after the headers went on. My car's computer didn't get along with them...it does now though