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Old 09-10-2005
B300OWNER's Avatar
Thread Starter
Join Date: Aug 2005
Location: Sabana Grande, PR
Posts: 35
New intake question?

I have a question for you people,
After a cone filter is installed is there something else I should do?
I mean any change in calibration, computer codes change its needed
to achieve the performence that a cone filter should give?
I need an scanner to let it know to my pickup computer that more air is comming and the motor should run better?

Well I was the man with pvc cai posted last week, well let me tell you everybody i return to the stock rubber pipe and i leave the cone filter
i will come with some pics as soon as i found black paint for the heat insulator
well thanks averybody
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Old 09-10-2005
n3elz's Avatar
RF Veteran
Join Date: Jun 2004
Location: Kennett Square, PA
Posts: 10,623
Generally, no.

Some MAF sensors will react to the change in turbulence by showing a different calibration curve, but it's usually within the range that can be trimmed by the PCM.

In just a few cases, the PCM cannot trim the fuel far enough and you run rich or lean. If it happens enough you'll get a check engine light. Not so common, though.

I use a scanner to check LTFT (long term fuel trim) as this value shows you where the PCM is making major adjustments to make up for MAF mis-calibration. The range of authority for that is limited, and it "clips" around 28% or so if I remember correctly (and I may not be, but it's something like that).

I did a MAF mod on a friends 4.0 (Doc) and it made him run lean at the high end and I had to "trim" the sensor and feather the edges of the cuts to get the airflow cal back to a range the PCM could trim. Pain in the butt.

Usually, though, the CAI/filter does not cause the MAF to be out of calibration. If you don't get a CEL light then don't worry about it much.
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