MAF sensor code 4.3L Blazer

[Drew99GT]

Got a constant on (not flashing) service engine soon light with a "MAF sensor high frequency" code stored. Light came on last night, I undid the gas cap and really cranked it on tight, and the light was out this morning with that code stored. Does high frequency/voltage mean lower than normal airflow or vice versa? I was thinkin it could be the EVAP pulling air past the gas cap and therefor not enough air was flowing past the meter for the current operating conditions at the time the code was set.

I can get a MAF sensor from the junkyard for cheap if need be.

 

[97tbird]

I would try cleaning the MAF first.

 

[kd3yt]

About two months ago I had the same code. I VERY CAREFULLY cleaned the MAF sensor. The tiny wires inside were thickly coated with carbon. Then cleared the code and it hasn't returned since.

 

[kd3yt]

I forgot to mention - this was on a 2001 Blazer with 60000 miles.

 

[Drew99GT]

I'll try cleaning it. Code hasn't retuned as of yet.

 

[T-Keith]

Clean the MAF with electrical contact cleaner, if comes back check the wires. One should have ~5 volts from the PCM, one should have ground.