oil in the cold air and mas????
- Thread starter ritter5.0
- Start date
what does this mean when you have oil in the cold air and MAS
Too much oil on the K&N filter?
The only other source is from neck of the oil filler. Did you add oil with the engine running?
I think this is what he meant.
If so, just remove the MAS (you need a tamperproof torx bit) and gently clean the wires with a light aerosol spray of electrical contact cleaner.
As Wes recently educated me, when the wire gets dirty, it creates a double whammy. The WOT feedback goes lean. The double whammy part is that the idle trim also goes way rich and the puter adapts (going lean), which further throws the WOT tune towards lean (if I understood Wes correctly).
Stanger007
Founding Member
Here's the comments from page 9-44 of the CRAI8 document:
When the airmeter fails due to contamination (oil/dust) on the element, it goes rich at low flows and lean at high flows. Since it is impossible to adapt at max AM, the correction learned at lower flows is applied. When the lean correction learned at low flows (due to rich condition) is applied at high flows, the already lean condition at max AM gets worse, causing engine overtemp. This logic prevents the application of such erroneous correction.
What then follows is some code that will fudge the numbers so that the leanness isn't nearly as bad as it could potentially be. The take home from this is to keep the meter clean, as it is the PCM's primary method of judging how much fuel to inject.
Wes
When the airmeter fails due to contamination (oil/dust) on the element, it goes rich at low flows and lean at high flows. Since it is impossible to adapt at max AM, the correction learned at lower flows is applied. When the lean correction learned at low flows (due to rich condition) is applied at high flows, the already lean condition at max AM gets worse, causing engine overtemp. This logic prevents the application of such erroneous correction.
What then follows is some code that will fudge the numbers so that the leanness isn't nearly as bad as it could potentially be. The take home from this is to keep the meter clean, as it is the PCM's primary method of judging how much fuel to inject.
Wes
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