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#1
12-12-2018, 08:04 PM
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Cat replacement
Had a honeycomb breaking loose on the driver side cat, no check engine light. Put a set of 200 cell high flows from flowmaster on and now I have a check engine light. A few people had mentioned to me that they ran 200 cells with no problems, didn't work for me. Anybody have any suggestions for cats to get rid of this engine light now? Sent from my SM-G965U using Xoutpost.com mobile app 
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#3
12-12-2018, 11:26 PM
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Tried the angled elbow ones stacked with plug non-foulers, still have the light.
Sent from my SM-G965U using Xoutpost.com mobile app
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#4
12-13-2018, 12:19 AM
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What error/s
Sent from my iPhone using Tapatalk Pro
__________________
2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#5
12-13-2018, 12:29 AM
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#6
12-13-2018, 12:38 AM
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I started getting fuel trim cat errors. I'm looking into the possibility of cat simulator for post cat. My truck doesn't need smog testing after next year anyhow.
Sent from my iPhone using Tapatalk Pro
__________________
2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#7
12-13-2018, 12:39 AM
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I'm trying to keep mine emissions ready, being military I'll never where I'm going to end up.
Sent from my SM-G965U using Xoutpost.com mobile app
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#8
12-14-2018, 12:59 AM
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I replaced both pre cat about three weeks ago; instantly got a huge bump in mpg which was a main driving force behind the upgrade, but on my first longer trip of 75 miles, my mpg was even worse.
A week later I started getting post cat fuel trim errors and a week later they started every drive cycle! After hours and hours of searching the net I finally found a mention of reset [fuel] adaptations and yesterday I found the sub menu to do this with the foxwell nt510. Reset fuel trim and reset the code that came back every start for the past week or ten days then drove 75 miles home.  Woot woot! It worked! Not only no error, the post cat O2 readings that have been stuck at 0.7 volts finally will go as low as 0.1 volts and average very close to 0.45. Time will tell if it was a permanent fix, but the proof in the photo above where I'm used to seeing 18.5 mpg for the last 3 weeks I'll take a 25% bump in mpg!
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2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#9
12-14-2018, 01:01 AM
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What engine do you have? The 4.8 only has two cats per bank.
Sent from my SM-G965U using Xoutpost.com mobile app
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#10
12-14-2018, 01:40 AM
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M54 3.0
__________________
2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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