While running MAF CL I noticed one WOT run would be rich or lean and the next run (within seconds) would be the opposite. I had heard that perhaps it was a fuel trim carried over from CL.
So I switched to OL and had the same thing happen. Attached is a log illustrating this in OL.
Any ideas?
LS2, small cam and ported heads
sorry, im at work, but is the commanded a/f changing?
We need your tune file. Your ETC is reading different in both of those WOT runs also, perhaps some adders are kicking in and causing the differences.
Free HP Tuners Beginners Tuning Guide
LS1 Tuning Guide
Michigan Snowmobiler
1969 Firebird: 11.67@114 [email protected] 1/8 1.70 60 ft. EPS cam 234/246 .602.606 114+3, 6.0 LQ4, L92 heads milled 10.5:1, Ported L76 intake, ported 90mm Holley TB, 100mm MAF, FIC Custom injectors, Hooker LT, PYPES dual exhaust with an X pipe, 4L65e with all of the good parts inside, FTI 4000 RPM Stall, 12 bolt with 3.73 gears. HP Tuner tuned by me
Thanks for the replies.
The ETCs are 99% - 100% for all three WOT runs. However the 2nd run the throttle was lifted about halfway through the run, so the rest of the run ETC is reduced.
Attached is the tune.
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