Quote:
Originally Posted by TurboBob
because the airflow is really low at that RPM, the ecu thinks you are decellerating. and leans out the fuel. If it is troublesome, you will have to richen up this spot.
your idle appears too rich, the O2 trim dives to its minimum to try to correct the problem, and since it is still rich after about 10 seconds, it gives up.
Try leaning the idle out some.
what are your regular trims reading? Remember, trims do not read straight percent, they read 4X of the actual fuel correction. So for a trim of 80 the ecu is pulling about 5%
Bob
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Couple of observations / questions:
1) I cannot seem to effectively lean the idle. I am going to reset base idle and look at IAC values later....
2) When leaning idle, how long can it take to change AFR? Is it usually instanteous? or should I be waiting a couple of minutes?
3) I can get lo-load page to give me stoich readings at each rpm level with the car warm, and stationary,me just applying and holding trhottle and adjusting....going up thru the rpm range....but, I have to add + 20% or so at 1200 and above-- is this "normal"? second,is this a proper way to tune lo-load?? So I effectively net -17% or so user tune (560 injectors)....but keep in mind, ported heads, free flowing exhaust bigger turbos, etc....so maybe its ok (?) It does sound and feel better with the extra fuel....I have not driven it yet. Im a little worried about the transition from -37 at 800 rpm to -17 at 1200 ....not sure if that will present any issues....
Any good links to tuning?
EDIT: #1 IAC Seems good, and seems to act normal. NEvermind on #3, experimanted and found this is not a good way to tune. While it works with no load, I was indeed rich at cruise afterwards, although a little more fuel in the lower range of the lo load page (rpms) does seem to smooth the car out a tad...