swathdiver
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Ok, the new Magnaflow Y-Pipe is installed (new cats) and fuel trims were reset and engine was burning 93 octane fuel. Mileage still poor, no misfires, runs great. What does the data suggest?
Fuel Trims Crazy???
- Thread starter swathdiver
- Start date
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swathdiver
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@BlackBearPerf @badandyturbo @randeez @Rocket Man @iamdub @Galante @01ssreda4 @Scottydoggs @Doubeleive @Cattivo
The above run is saved in the Tech2 and can pull up other information if need be.
The above run is saved in the Tech2 and can pull up other information if need be.
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Scottydoggs
Full Access Member
drive it for a few days, then re check the trims. if you reset them, then scanned them they have not learned yet. can take a few drive cycles for them to fully learn.
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swathdiver
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Scott, this was taken about 300 miles after they were reset and if memory serves, it was about all city driving. Right after this we filled up on E85 and now that tank is about exhausted and she's ready for more.
Scottydoggs
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was that scan there on gas? or the e85?
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swathdiver
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93 octane gasoline.
Scottydoggs
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is there a separate reset for the content sensor?
the trims read the same when on the e85?
the trims read the same when on the e85?
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swathdiver
Full Access Member
Yes, the content sensor is separate and was at 3% during this video.
No data logging has occured since switching over to E85 after the repair.
What prompted this repair was a P0430, the right side cat. Turns out this cat was not original either and the code would appear and be reset every time I drove the truck. About a week before the repair we got a P0420 code. LTFT were usually -1 or 2% on Bank 1 and -2 or -3% on Bank 2. Before the repair, I have no recollection if there was a difference in Fuel Trims between 93 and E85.
Scottydoggs
Full Access Member
new cats are high flow i suppose right?
maybe the post cat o2's are not liking the new cats so much.
maybe the post cat o2's are not liking the new cats so much.
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swathdiver
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Can the Lower O2 Sensors affect the Trims? Hmm... I have new Upper Sensors sitting on my work bench and was putting off buying the Lowers unless I had a really really really good reason to buy them. Spent too much already.
Yes, the cats are quite large, Magnaflow 51578: https://www.magnaflow.com/products?partnumber=51578
Yes, the cats are quite large, Magnaflow 51578: https://www.magnaflow.com/products?partnumber=51578
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