Jul 8th, 13, 06:53 PM
Join Date: Sep 2000
Location: Va Beach VA
Re: Just installed new maf sensor....possible issue?
Generally, new ones are suppose to work out of the box without break-in period. But stranger things have happened.
The theory of operation, a wire has x amount of current going through it from the PCM.
As air is drawn across it, the wire cools and current is reduced. The PCM issues more current to bring the current level back to the X value. This is how the PCM 'measures' the amount of air ingested and is one of many input senses for the PCM to make a fuel delivery decision for proper engine running condition.
Once the engine turns off, the PCM heats up the wire burning off any dirt/trash on the wire for next operation.
A couple induced problems have been using an aftermarket overly 'oiled' air filter, oil does upset the current sensing properties, and removing the screen.
Also, dirt collection over time, the fine dust the air filter does not filter.
Last item would be a broken bellows after the MAF to manifold or a poorly installed MAF against the manifold.
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