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Long Term Trims don't match on for lean/rich

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Old 07-21-2011, 09:16 AM
thomastl thomastl is offline
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Long Term Trims don't match on for lean/rich

I have some software and connector that allows me to monitor the engine and check codes.
I hooked it up and was monitoring the engine on the way to work today. I noticed several times that the long term trims did not match.
Trim 1 would read 5.7% lean
Trim 2 would read 1.4% lean

Then at the next update it would go back to 3% or so on both and hold for a few updates. Then it would go back to a different readings again. Then next update back to matching.

I also noticed on the short term that a lot of times bank 1 would be leaner than bank 2.

Is this normal or is this indicating a potential problem and could possibly be why my highway fuel mileage is around 17 to 18 at 74 mph cruise set.
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Old 07-22-2011, 01:13 PM
cartmanea cartmanea is offline
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74mph is probably the cause of your poor mileage. The rated numbers are for under 65mph I believe.
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Old 07-22-2011, 09:35 PM
excaliber551 excaliber551 is offline
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Originally Posted by cartmanea View Post
74mph is probably the cause of your poor mileage. The rated numbers are for under 65mph I believe.
Actually the highway rating of 21 was achieved with the 3:31 gearing driving 48 mph on average.
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Old 07-23-2011, 08:42 AM
truckerdude truckerdude is offline
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Originally Posted by excaliber551 View Post
Actually the highway rating of 21 was achieved with the 3:31 gearing driving 48 mph on average.
you need to read a little closer. There is also a high speed test that is averaged in as well as NO where doe it say that the 3.31 axle was used
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Old 08-07-2011, 10:52 AM
trippen1999 trippen1999 is offline
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bank 1 and bank 2 are always going to be a little different.mine is the same way,i have been monitering using my dashhawk.the trims are the ecu correcting for minute differances inharent to all engines.as long as your ltft are +/-8to10% your good.
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