Quote:
Originally Posted by davebb
ECM-1300 Mass air flow (MAF) sensor signal - Signal to High
how does low egr flow give this,?
ECM-1300 Mass air flow (MAF) sensor signal - Signal to High
maybe over boosting
Dave
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well when a certain volume of air ( exhaust gas ) is entering the manifold from an EGR valve and going into the combustion chamber it is bypassing the air mass meter so not accounted for .. There is a correction applied to the air mass meter reading when the ECU opens the EGR valve ..
When the EGR valve is open because it is sticking , this correction is not added of course so there is less air going through the air mass meter than expected .
likewise if the valve is stuck shut the correction is applied but the additional expected gas is not being allowed in so it goes through the air mass meter instead making the air flow higher than expected .