Idle trims, anyone else experienced this?

[Blue02WS6]

Hi

Car data: 5.7, 224 cam, lt's, 2.5" duals, lid and ported TB

I have been tuning with a wide band and feel pretty good about where the MAF and RAF numbers are at...one time they may be neg. and the next pos. so I have taken an average and most of the time the STFT's are in line, but every now and then they go either neg or pos. to the point of being 15-20 but the idle seems fine, the car doesn't buck, stumble, etc. What the frick is going on...this is driving me nuts. Has anyone else experienced this?

[mrfister77]

My '02 silvy does that now after my GMPP ASA cam install. I am convinced it b/c the cam, ram air intake, longtubes, and 3" dual exh. has thrown my VE and MAF cal. off. I just haven't had time to redo it. No KR or lean conditions so I'll do it when I can. Maybe your blip is along those lines.

[Blue02WS6]

My '02 silvy does that now after my GMPP ASA cam install. I am convinced it b/c the cam, ram air intake, longtubes, and 3" dual exh. has thrown my VE and MAF cal. off. I just haven't had time to redo it. No KR or lean conditions so I'll do it when I can. Maybe your blip is along those lines.

I don't know...

My VE and MAF tables are tuned, and I would say 80% of the time the trims read right where they should....and it's strange it Always settles down after driving long enough.

[12secSS]

If it is not causing issues ... leave it alone! They are called trims for a reason, don't expect them to stay perfect all the time.

[flame]

I'll bet it has to do with IAT changes heat soak on the IAT results in lean A/F

[FastEddy]

The bucking is probably from timing. Try lowering and smoothing out your timing under 2500 rpm and see what happens.