Northstar Engines and System Technical Discussion Discussion, The use of Aftermarket reusable air filters in Cadillac Engine Technical Discussion; If you use an aftermarket Air filter it can screw up the MAF
The Trans can actually fail.
You may ...
#04-07-30-013B: Info - Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter - (Feb 1, 2007)
Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter
Models: 2007 and Prior GM Cars and Light Duty Trucks
This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 04-07-30-013A (Section 07 -- Transmission/Transaxle).
First, Inspect the vehicle for a reusable aftermarket excessively/over- oiled air filter
DO NOT repair MAF sensors under warranty if concerns result from the use of an excessively/over-oiled aftermarket, reusable air filter.
The use of an excessively/over-oiled aftermarket, reusable air filter may result in:
• Service Engine Soon (SES) light on
• Transmission shift concerns, slipping and damaged clutch(es) or band(s)
• Engine driveability concerns, poor acceleration from a stop, limited engine RPM range
The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur.
When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over- oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern.
The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty.
If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs.
Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items.
If you have a car the does not use a Throttle cable and uses ETC you will really have issues. One of the major components to the ETC is the MAF. If the MAF is off the PCM has a terrible time guessing what angle the throttle plate needs to be
AJ, For less than the cost of an aftermarket oiled cotton filter you can rebuild the entire intake tract of a mid-year Seville/Deville and wind up with a far better system. All a CF member needs to do is search the threads: You and several of us have debunked the CAI myth many times over......the answer to a lot of the Northstar 1999-2003 air intake questions is in your garage toolbox.
stng, Yes, the 2000-2003 airbox, which is already a fully functional CAI system, can be opened 2 ways: ......Either go out the fender side with a rectangular hole and cut a foam gasket which seals to the existing opening in the inner fender stamping, or go out the bottom, enlarging the existing opening, fabricate a spigot which is pop-riveted to the airbox, and carry a 3" flex tube down to the lower grille area. There's really not a lot of airbox "meat" to work with, so both approaches done together offer the most potential airflow, and are very hard to detect with a casual look. Change to a WIX panel filter which offers essentially no flow restriction (more pleats, more surface area).
It's pretty educational to temporarily rig a 0 - 30" vacuum gauge to a T on the throttlebody manifold vacuum side and do some WOT's with different panel filters, and a couple with no filter. Blows away a lot of advertising myths. (If you can get your manifold vacuum to less than 2" at WOT redline there is absolutely nothing more to be done, short of nitrous or supercharging, that will make the intake tract "better".)