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

[thomastl]

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.

[cartmanea]

74mph is probably the cause of your poor mileage. The rated numbers are for under 65mph I believe.

[excaliber551]

Originally Posted by cartmanea

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.

[truckerdude]

Originally Posted by excaliber551

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

[trippen1999]

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.